From 35c6ff5a71e2cdf1336a4f767331b82cf14f0969 Mon Sep 17 00:00:00 2001
From: claude <no-reply@agents.claude.kvmx.ru>
Date: Thu, 13 Aug 2026 02:50:59 +0400
Subject: [PATCH] Make delivery and integration failures explicit

Persist reminder presentations and retry state, atomically complete collapsed deliveries, fall back across away reaches, and block permanent failures visibly (V-715, V-678). Fail closed when enabled integrations lack credentials and keep remote arms explicitly dark (V-691). Give mavweb one sanitized, request-correlated error contract (V-689). Owner explicitly requested direct commits to master.
---
 .gitignore                                    |   4 +
 JOURNAL.md                                    | 188 +++++++
 Makefile                                      |   7 +-
 cmd/mavend/main.go                            |  30 +-
 cmd/mavend/ntfy_wiring_test.go                |  35 ++
 cmd/mavend/telegramintake.go                  |   2 +-
 cmd/mavend/tick.go                            | 136 ++++-
 cmd/mavend/tick_reminder_delivery_test.go     | 170 +++++++
 cmd/mavend/voicewire.go                       |   8 +-
 cmd/mavweb/ambient.go                         |  30 +-
 cmd/mavweb/ambient_test.go                    |  12 +
 cmd/mavweb/chat.go                            |  35 +-
 cmd/mavweb/ecosystem.go                       |  16 +-
 cmd/mavweb/events_test.go                     |   9 +-
 cmd/mavweb/facts.go                           |  30 +-
 cmd/mavweb/main.go                            |  24 +-
 cmd/mavweb/models.go                          |  39 +-
 cmd/mavweb/models_test.go                     |  21 +
 cmd/mavweb/notifications.go                   |  11 +-
 cmd/mavweb/pages.go                           |  39 +-
 cmd/mavweb/problems.go                        | 118 +++++
 cmd/mavweb/problems_test.go                   | 135 +++++
 cmd/mavweb/reminders.go                       |  20 +-
 cmd/mavweb/reminders.html                     |   2 +-
 cmd/mavweb/reminders_test.go                  |  13 +
 cmd/mavweb/routines.go                        |  34 +-
 cmd/mavweb/shell.go                           |  10 +-
 cmd/mavweb/tasks.go                           |  73 ++-
 cmd/mavweb/tasks_test.go                      |  18 +
 cmd/mavweb/tools.go                           |  37 +-
 cmd/mavweb/voiceproxy.go                      |  32 +-
 cmd/mavweb/webauthn.go                        |  32 +-
 deploy/README.md                              |   5 +
 deploy/cw2/serve.py                           |  19 +-
 deploy/cw2/test_serve.py                      |  24 +
 deploy/mavend.json                            |  11 +-
 deploy/telegram.env.example                   |  32 +-
 docker-compose.yml                            |  12 +-
 docs/caveats/CLAUDE.md                        |   9 +-
 docs/caveats/config.md                        |  11 -
 docs/caveats/storage.md                       |   8 -
 docs/caveats/transport.md                     |  12 -
 docs/deployment.md                            |  17 +-
 docs/offload.md                               |   7 +-
 docs/operations.md                            |  20 +-
 internal/config/config.go                     |  36 +-
 internal/config/config_test.go                | 120 ++++-
 internal/config/deployconfig_test.go          |  65 ++-
 internal/config/workstation.go                |  91 +++-
 internal/delivery/channel.go                  |  18 +-
 internal/delivery/dispatcher.go               | 189 ++++---
 internal/delivery/dispatcher_test.go          | 257 +++++++++-
 internal/delivery/durability_test.go          |   4 +-
 internal/delivery/ntfysink/ntfysink.go        |  52 +-
 internal/delivery/ntfysink/ntfysink_test.go   |  77 ++-
 .../delivery/telegramsink/telegramsink.go     |  49 +-
 .../telegramsink/telegramsink_test.go         |  19 +-
 internal/ipc/api.go                           |  36 +-
 internal/ipc/maperr_test.go                   |   5 +-
 internal/ipc/storeapi.go                      |  21 +-
 internal/loop/gather.go                       |  65 ++-
 internal/loop/gather_test.go                  |  33 ++
 internal/store/delivery.go                    |  33 +-
 internal/store/delivery_test.go               |   8 +-
 internal/store/migrations.go                  |  23 +
 internal/store/reminders.go                   | 476 +++++++++++++++++-
 internal/store/reminders_delivery_test.go     | 417 +++++++++++++++
 67 files changed, 3174 insertions(+), 477 deletions(-)
 create mode 100644 JOURNAL.md
 create mode 100644 cmd/mavend/ntfy_wiring_test.go
 create mode 100644 cmd/mavend/tick_reminder_delivery_test.go
 create mode 100644 cmd/mavweb/problems.go
 create mode 100644 cmd/mavweb/problems_test.go
 create mode 100644 deploy/cw2/test_serve.py
 delete mode 100644 docs/caveats/transport.md
 create mode 100644 internal/store/reminders_delivery_test.go

diff --git a/.gitignore b/.gitignore
index 30023b1..0033865 100644
--- a/.gitignore
+++ b/.gitignore
@@ -54,6 +54,10 @@ opencode.json
 # Test coverage output
 coverage.out
 
+# Python service/test bytecode.
+__pycache__/
+*.py[cod]
+
 # Agent worktrees and local agent state. The workflow itself is tracked: the
 # hooks, the skills and the prose dictionary are how a session behaves, so they
 # get reviewed like code. Everything else under .claude/ is scratch.
diff --git a/JOURNAL.md b/JOURNAL.md
new file mode 100644
index 0000000..473fe3f
--- /dev/null
+++ b/JOURNAL.md
@@ -0,0 +1,188 @@
+# Maven completion journal
+
+This journal tracks the autonomous completion goal started on 2026-08-13. It
+is an operational index, not a substitute for living subsystem documentation,
+dated evaluations, Vikunja tasks, or focused caveat entries.
+
+## 2026-08-13 — baseline and backlog reconstruction
+
+Goal: make Maven usable end to end with every current and planned feature
+wired, tested, and polished. Completion requires clean automated gates and
+successful sessions across local, degraded-ecosystem, and integrated modes.
+
+Initial observations:
+
+- `HEAD` is `2cf8b7e`, identical to both local and remote `master`, while the
+  checked-out branch is the stale `task/704-...` branch.
+- The worktree already contained staged documentation/evaluation changes,
+  staged transcript deletions, an unstaged `deploy/mavwaked.service` change,
+  and untracked `deploy/asoundrc`. These are pre-existing work and are being
+  preserved and validated before any commit.
+- The repository has no prior goal journal. Durable subsystem facts continue
+  to belong under `docs/`; unresolved limits continue to belong under
+  `docs/caveats/` with a task and revisit trigger.
+
+Work streams started:
+
+- Vikunja project 2: inventory every open task and recover acceptance criteria.
+- Repository: compare feature plans, caveats, routing/ecosystem contracts, and
+  implementation.
+- Verification: run build, race tests, simulator, analyzer gates, and inspect
+  skipped hardware/model evaluations separately.
+- Runtime: exercise the web, IPC, voice, model, and sibling-service paths with
+  real local dependencies where available and explicit degraded-mode probes
+  otherwise.
+
+References: `docs/workflow.md`, `docs/qa.md`, `docs/ecosystem.md`,
+`docs/routing.md`, `docs/caveats/CLAUDE.md`, and Vikunja Maven project 2.
+
+### Backlog correction
+
+The first Vikunja page was accidentally read without a `done: false` filter and
+mixed closed history into the working set. Re-querying all pages strictly open
+produced 127 records: 89 implementation-open, 20 shipped-but-QA-open, 12
+external/owner gates, and 6 duplicate or stale-open records. Closed tasks are
+used only as commit provenance; they are not work to redo. V-704 was the only
+open hanging task and was closed after its measured correction landed.
+
+### Model-aware baseline
+
+The ordinary `make test` passed but does not set `MAVEN_ONNX_LIB`, so model-aware
+tests can self-skip. The explicit ONNX boundary gate exposed V-702/V-703: the
+held-out `я рассказывал тебе про байкал?` was the sole miss at 28/29. A
+three-neighbour class score fixed the semantic collision without adding a word
+pattern or copying the held-out sentence. Boundary is now 29/29 and the adjacent
+topic gate remains 43/43. Measurement:
+`docs/evals/2026-08-13-personal-boundary-neighbourhood.md`.
+
+That narrow result was not accepted as the completion gate. A second agent
+wrote a balanced 72-case RU/EN matrix across remembered speech, possession,
+narrative, proper nouns, personal preambles, and advice/current questions. It
+contains no production seeds and no Baikal paraphrase. The top-three candidate
+scores only 61/72 (84.7%); top-two reaches 62/72, one-neighbour 56/72, and a
+whole-class centroid 54/72. V-702 therefore remains open while a principled
+classifier is developed against the independent matrix. The 29/29 measurement
+describes the narrow regression set, not general boundary quality.
+
+### Live delivery incident
+
+The five-service compose stack was running, but a due reminder was being
+re-phrased and retried through ntfy every tick. The sink returned HTTP 403 each
+time. Only secret names were inspected: the configured ntfy and workstation
+token variables were absent from the deployed environment file; no secret
+values were read into this journal. The durable outbox records each failed
+attempt, but the retry path has no backoff or alternate channel and spends the
+resident model again before every failure. This is active V-651 behavior, with
+the repeated-phrasing shape related to V-687.
+
+V-715 now owns the incident acceptance criteria. In the working tree, phrases,
+collapsed-group identity, attempts, and next-attempt time are durable; definite
+failure backs off from one minute to a capped hour; retries and restarts reuse
+the exact phrase; and away delivery tries ntfy then Telegram, stopping at the
+first success. The committed deployment explicitly disables the uncredentialed
+ntfy block. Independent review added a real occurrence key for collapsed
+bundles, suppresses crash-ambiguous attempts from automatic replay, classifies
+HTTP 401/403 as permanent, blocks permanently unreachable reminders visibly,
+and commits the successful outbox result plus every collapsed original in one
+SQLite transaction. The store, delivery, IPC, loop, config, and mavweb race
+suites pass. A live rebuild and one-time delivery of the existing backlog are
+still required before V-715 is closed.
+
+### Explicit integration enablement
+
+V-691's deployment boundary was audited against every `${VAR}` reference. The
+canonical `deploy/telegram.env.example` now names Telegram, ntfy, workstation
+model, workstation STT, Home Assistant, ambient, CW2, and database-key inputs.
+Enabled Telegram, ntfy, ambient, non-loopback workstation model, and
+non-loopback workstation STT paths refuse missing credentials; each arm has an
+explicit disabled state. The live config disables the currently uncredentialed
+ntfy and workstation-model arms while retaining the separately credentialed
+STT arm. CW2 also refuses a non-loopback bind without its token.
+
+Focused Go race suites, the Python CW2 startup contract, deploy-config drift
+test, secret-expanded config validation (values not printed), and
+`docker compose config --quiet` pass. The workpc is unreachable from this host,
+so installing the updated CW2 script there remains an external deployment step;
+the affected model arm is explicitly dark rather than ambiguously half-live.
+
+### Traceable web failures
+
+V-689 gives every mavweb response a server-generated request ID and routes
+every handler failure through one sanitized problem envelope. Stable error
+codes and the request ID reach the browser; the wrapped internal error reaches
+only the server log beside the same ID. Degraded inline panels use stable public
+text rather than backend paths or tokens, and direct ecosystem reads propagate
+the web request ID as their correlation ID. An AST guard prevents new production
+handlers from bypassing the contract with `http.Error`. The full mavweb race
+suite passes, including disclosure, untrusted-ID, log-join, and propagation
+tests.
+
+### Bounded external responses
+
+Three audit defects were repaired and committed directly to `master`:
+
+- V-608 (`d7e8804`): llama completion responses are capped at 1 MiB, including
+  the LAN workstation seam.
+- V-675 (`459fe7a`): remote STT requires nonblank text and an explicit finite
+  confidence in `[0,1]`, caps JSON at 64 KiB, and falls back to mavsttd on a
+  malformed HTTP 200.
+- V-676 (`7d0250a`): Open-Meteo geocoding and forecasts are bounded, required
+  fields are nullable/validated, and coordinates/weather values are range
+  checked so `{}` cannot become plausible zero-degree weather.
+
+Each focused race suite passed and each task was closed only after the commit.
+
+### Transport shutdown
+
+V-679 (`de61b75`) adds the listener's `done` channel to TCP `Accept`. A
+concurrent-close test holds a silent peer in handshake and proves an in-flight
+accept returns `net.ErrClosed`; the race test passed twenty consecutive runs.
+
+V-688 (`80b6068`, caveat retirement `a0e6643`) bounds the browser push-to-talk
+body at ten minutes of mono PCM and configures header, idle, and read limits on
+the web server. The unused `/ws` handler was removed instead of retaining a
+second unauthenticated streaming transport with no browser caller. Focused race
+tests prove the exact-size request succeeds and an oversized request returns
+HTTP 413.
+
+### Conversation continuity
+
+V-542 (`da9114b`) repairs the five-turn monitor conversation without changing
+single-turn intent classification. Exact user utterances are now persisted
+separately from normalized intent slots and retained in chronological order.
+An anaphoric query with live transcript context reaches the chat path, while
+non-anaphoric sources are unchanged and acts stay fail-closed. An explicit
+conversation opener extends the session lifetime through later fact/query/chat
+routes without suppressing the grounded fact write.
+
+The deterministic scenario now names the monitor in all four contextual
+replies, proves that the original raw turn reached `PhraseChat` four times,
+stores the fact once, and produces zero unsolicited sends across five turns and
+one tick. Focused race tests passed for `cmd/mavend`, `internal/dialogue`,
+`internal/router`, and `internal/lexicon`. Measurement:
+`docs/evals/2026-08-13-conversation-continuity.md`.
+
+### Personal-data boundary
+
+V-702 replaces the narrow nearest-neighbour privacy gate with a frozen,
+class-balanced logistic head over multilingual-e5-small. It introduces no
+lexical exception and leaves the decision threshold at 0.5. Historical
+regressions score 29/29 and the balanced 72-case RU/EN fixture scores 72/72.
+
+The first 24-case challenge found one private-configuration miss. That result
+was treated as model-selection data rather than advertised as independent
+proof. Shrinkage LDA and an LDA/logistic ensemble repaired it but regressed the
+72-case gate, so both were rejected. Increasing the logistic L2 coefficient
+from 0.0001 to 0.0003 repairs the miss while improving four-fold corpus
+cross-validation from 97/104 to 99/104 and whole-shape holdout from 91/104 to
+92/104. A fresh 24-case challenge written only after that head was frozen scores
+24/24 at minimum signed probability margin +0.1718. The original challenge is
+also 24/24 but its +0.0001 edge remains documented as a regression, not fresh
+evidence. Full measurement:
+`docs/evals/2026-08-13-personal-boundary-linear-head.md`.
+
+During the audit, running multiple ONNX-backed tests in one `go test` process
+showed that only the first initializes; later tests self-skip because the
+runtime is process-global. All V-702 figures were therefore rerun in separate
+processes. V-716 tracks fixing that harness gap rather than hiding it in this
+feature.
diff --git a/Makefile b/Makefile
index 90ed983..03f9551 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ PIPER_BIN     := $(shell pwd)/deps/piper/piper
 PIPER_MODEL   := $(shell pwd)/models/tts/ru_RU-irina-medium.onnx
 PIPER_ESPEAK  := $(shell pwd)/deps/piper/espeak-ng-data
 
-.PHONY: t audit simulate stt-fixtures test-stt-golden all build build-stt build-tts build-daemon build-client build-waked build-web build-poll build-caldav clean test fmt-check vet run-stt run-tts run-web download-embedder deps-go deps-sentinel deps-vuln vuln deps-lint lint deadcode analyze tidy eval-router eval-reach eval-recall eval-phrasing eval-models build-gpud
+.PHONY: t audit simulate stt-fixtures test-stt-golden test-cw2-config all build build-stt build-tts build-daemon build-client build-waked build-web build-poll build-caldav clean test fmt-check vet run-stt run-tts run-web download-embedder deps-go deps-sentinel deps-vuln vuln deps-lint lint deadcode analyze tidy eval-router eval-reach eval-recall eval-phrasing eval-models build-gpud
 
 all: build
 
@@ -188,7 +188,10 @@ simulate:
 	CGO_CFLAGS="$(CGO_CFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" LD_LIBRARY_PATH="$(shell pwd)/deps/lib" \
 		$(GO) test -v -count=1 -run TestSimulator ./cmd/mavend/
 
-test: fmt-check vet
+test-cw2-config:
+	python3 -m unittest discover -s deploy/cw2 -p 'test_*.py'
+
+test: fmt-check vet test-cw2-config
 	CGO_CFLAGS="$(CGO_CFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" LD_LIBRARY_PATH="$(shell pwd)/deps/lib" \
 		$(GO) test -race -coverprofile=coverage.out ./internal/... ./cmd/...
 
diff --git a/cmd/mavend/main.go b/cmd/mavend/main.go
index 75c4f76..9c6005a 100644
--- a/cmd/mavend/main.go
+++ b/cmd/mavend/main.go
@@ -559,7 +559,7 @@ func run(args []string) error {
 func personaFacts(cfg *config.Config) persona.Facts {
 	f := persona.Facts{
 		// Telegram lives outside the voice block, so it counts either way.
-		Telegram: cfg.Telegram != nil && cfg.Telegram.BotToken != "" && cfg.Telegram.ChatID != "",
+		Telegram: cfg.Telegram != nil && !cfg.Telegram.Disabled && cfg.Telegram.BotToken != "" && cfg.Telegram.ChatID != "",
 	}
 	if cfg.Voice == nil {
 		return f
@@ -678,16 +678,12 @@ func wireGatherer(st *store.Store, cfg *config.Config, rules []loop.Rule) *loop.
 // reconciled to "unknown" here, before the tick loop resumes sending, so
 // nothing auto-resends into that ambiguity.
 func wireDispatcher(st *store.Store, cfg *config.Config, voiceW *voiceWiring) (*delivery.Dispatcher, error) {
-	var ntfy delivery.Sink
-	if cfg.Ntfy != nil {
-		s, err := ntfysink.New(*cfg.Ntfy)
-		if err != nil {
-			return nil, fmt.Errorf("wire ntfy sink: %w", err)
-		}
-		ntfy = s
+	ntfy, err := wireNtfySink(cfg.Ntfy)
+	if err != nil {
+		return nil, err
 	}
 	var telegram delivery.Sink
-	if cfg.Telegram != nil {
+	if cfg.Telegram != nil && !cfg.Telegram.Disabled {
 		s, err := telegramsink.New(*cfg.Telegram)
 		if err != nil {
 			return nil, fmt.Errorf("wire telegram sink: %w", err)
@@ -712,6 +708,22 @@ func wireDispatcher(st *store.Store, cfg *config.Config, voiceW *voiceWiring) (*
 	}), nil
 }
 
+// wireNtfySink keeps an optional reach optional without ever turning a missing
+// secret into anonymous publishing. A block is live unless it says disabled;
+// therefore an expanded-empty token in a live block fails startup instead of
+// spending days in a permanent 403 retry loop. Disabled is an explicit
+// operator choice and lets another away reach take over.
+func wireNtfySink(cfg *ntfysink.Config) (delivery.Sink, error) {
+	if cfg == nil || cfg.Disabled {
+		return nil, nil
+	}
+	sink, err := ntfysink.New(*cfg)
+	if err != nil {
+		return nil, fmt.Errorf("wire ntfy sink: %w", err)
+	}
+	return sink, nil
+}
+
 // wireTickLoop reads the loop's three intervals and its schedules out of the
 // config, so the two boot paths cannot disagree about them.
 func wireTickLoop(st *store.Store, gatherer *loop.Gatherer, dispatcher *delivery.Dispatcher, phr phraser.Phraser, rules []loop.Rule, cfg *config.Config) *tickLoop {
diff --git a/cmd/mavend/ntfy_wiring_test.go b/cmd/mavend/ntfy_wiring_test.go
new file mode 100644
index 0000000..f01caed
--- /dev/null
+++ b/cmd/mavend/ntfy_wiring_test.go
@@ -0,0 +1,35 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/kami/maven/internal/delivery/ntfysink"
+)
+
+func TestWireNtfySinkRejectsMissingCredentialWhenEnabled(t *testing.T) {
+	_, err := wireNtfySink(&ntfysink.Config{
+		BaseURL: "https://ntfy.example", Topic: "maven",
+	})
+	if err == nil {
+		t.Fatal("expanded-empty credential did not fail an enabled reach")
+	}
+}
+
+func TestWireNtfySinkLeavesExplicitlyDisabledReachDark(t *testing.T) {
+	sink, err := wireNtfySink(&ntfysink.Config{
+		Disabled: true, BaseURL: "https://ntfy.example", Topic: "maven",
+	})
+	if err != nil {
+		t.Fatalf("wireNtfySink: %v", err)
+	}
+	if sink != nil {
+		t.Fatal("disabled reach built a live sink")
+	}
+}
+
+func TestWireNtfySinkRejectsMalformedEnabledConfig(t *testing.T) {
+	_, err := wireNtfySink(&ntfysink.Config{Token: "token", Topic: "maven"})
+	if err == nil {
+		t.Fatal("malformed enabled config did not fail wiring")
+	}
+}
diff --git a/cmd/mavend/telegramintake.go b/cmd/mavend/telegramintake.go
index ed63bba..99f4ff9 100644
--- a/cmd/mavend/telegramintake.go
+++ b/cmd/mavend/telegramintake.go
@@ -25,7 +25,7 @@ import (
 // already failed the boot in wireDispatcher for the same config, so a second
 // hard failure would only lose that message.
 func wireTelegramIntake(ctx context.Context, wg *sync.WaitGroup, api ipc.CoreAPI, cfg *config.Config) {
-	if cfg == nil || cfg.Telegram == nil || !cfg.Telegram.Intake || api == nil {
+	if cfg == nil || cfg.Telegram == nil || cfg.Telegram.Disabled || !cfg.Telegram.Intake || api == nil {
 		return
 	}
 	sink, err := telegramsink.New(*cfg.Telegram)
diff --git a/cmd/mavend/tick.go b/cmd/mavend/tick.go
index 76b0911..8b61c97 100644
--- a/cmd/mavend/tick.go
+++ b/cmd/mavend/tick.go
@@ -10,11 +10,13 @@ package main
 
 import (
 	"context"
+	"crypto/sha256"
 	"errors"
 	"fmt"
 	"log"
 	"os"
 	"path/filepath"
+	"sort"
 	"sync"
 	"time"
 
@@ -226,18 +228,11 @@ func (t *tickLoop) tick(ctx context.Context, now time.Time) {
 	// detectPatterns below for how idempotence and dismissal are respected.
 	t.detectPatterns(ctx, now, state)
 
-	// reminders: gate-bypassing class. fired once, marked after a successful
-	// delivery.  a failed send leaves the reminder pending — the next tick
-	// re-gathers and re-attempts.
+	// reminders: gate-bypassing class. The presentation and retry clock live on
+	// the reminder occurrence, so a transport outage neither spends the model
+	// every tick nor changes what the reminder says after a restart.
 	for _, d := range loop.RemindDecisions(state, due) {
-		pr, err := t.phraser.PhraseReminder(ctx, d)
-		if err != nil {
-			log.Printf("tick: phrase reminder %d: %v", d.Reminder.ID, err)
-			continue
-		}
-		if _, err := t.dispatcher.DispatchReminder(ctx, pr, now); err != nil {
-			log.Printf("tick: dispatch reminder %d: %v", d.Reminder.ID, err)
-		}
+		t.deliverReminder(ctx, d, now)
 	}
 
 	// sev4-away repeats: re-send un-acked telegram nudges per repeatInterval.
@@ -263,6 +258,125 @@ func (t *tickLoop) tick(ctx context.Context, now time.Time) {
 	}
 }
 
+// deliverReminder advances one due reminder (or collapsed bundle) through the
+// durable delivery state. A phrase is cached before the first external send;
+// every definite failure advances the persisted bounded backoff.
+func (t *tickLoop) deliverReminder(ctx context.Context, d loop.ReminderDecision, now time.Time) {
+	originals := reminderOriginals(d.Reminder)
+	pr, cached := cachedReminderPhrase(d, originals)
+	if !cached {
+		var err error
+		pr, err = t.phraser.PhraseReminder(ctx, d)
+		if err == nil && pr.Body == "" {
+			err = errors.New("phraser returned an empty reminder body")
+		}
+		if err != nil {
+			log.Printf("tick: phrase reminder %d: %v", d.Reminder.ID, err)
+			t.scheduleReminderRetry(ctx, originals, now)
+			return
+		}
+		if pr.Mood == "" {
+			pr.Mood = "neutral"
+		}
+		group := reminderDeliveryGroup(originals)
+		if err := t.store.CacheReminderPhrase(
+			ctx, originals, group, pr.Body, pr.Summary, pr.Mood,
+		); err != nil {
+			// A cancellation or another completion can win while phrasing. Do
+			// not send a presentation that no longer owns every original.
+			log.Printf("tick: cache reminder %d phrase: %v", d.Reminder.ID, err)
+			return
+		}
+		// The store now owns the phrase, but this tick's value predates that
+		// write. Stamp the exact persisted occurrence identity onto the value
+		// handed to the dispatcher so its outbox row can suppress an ambiguous
+		// crash for both a real reminder and a synthetic collapsed bundle.
+		for i := range originals {
+			originals[i].DeliveryGroup = group
+			originals[i].PhraseBody = pr.Body
+			originals[i].PhraseSummary = pr.Summary
+			originals[i].PhraseMood = pr.Mood
+		}
+		if d.Reminder.ID == 0 {
+			d.Reminder.Collapsed = originals
+		} else {
+			d.Reminder = originals[0]
+		}
+	}
+	// A phraser is not allowed to substitute the reminder decision. In
+	// particular, the durable group stamped above must reach the outbox.
+	pr.Decision = d
+
+	if _, err := t.dispatcher.DispatchReminder(ctx, pr, now); err != nil {
+		log.Printf("tick: dispatch reminder %d: %v", d.Reminder.ID, err)
+		t.scheduleReminderRetry(ctx, originals, now)
+	}
+}
+
+func (t *tickLoop) scheduleReminderRetry(ctx context.Context, originals []store.Reminder, now time.Time) {
+	if err := t.store.ScheduleReminderRetry(ctx, originals, now); err != nil {
+		log.Printf("tick: schedule reminder retry: %v", err)
+	}
+}
+
+// reminderOriginals converts the synthetic ID=0 bundle back to real store
+// rows. Keeping this in one helper makes it impossible to accidentally persist
+// retry state against reminder zero.
+func reminderOriginals(r store.Reminder) []store.Reminder {
+	if r.ID == 0 {
+		return append([]store.Reminder(nil), r.Collapsed...)
+	}
+	return []store.Reminder{r}
+}
+
+// cachedReminderPhrase reconstructs a PhrasedReminder only when every original
+// agrees on one persisted group and presentation. That agreement is what lets
+// a collapsed bundle survive a restart without being re-phrased.
+func cachedReminderPhrase(d loop.ReminderDecision, originals []store.Reminder) (delivery.PhrasedReminder, bool) {
+	if len(originals) == 0 || !originals[0].HasDeliveryPhrase() {
+		return delivery.PhrasedReminder{}, false
+	}
+	first := originals[0]
+	for _, r := range originals[1:] {
+		if !r.HasDeliveryPhrase() ||
+			r.DeliveryGroup != first.DeliveryGroup ||
+			r.PhraseBody != first.PhraseBody ||
+			r.PhraseSummary != first.PhraseSummary ||
+			r.PhraseMood != first.PhraseMood {
+			return delivery.PhrasedReminder{}, false
+		}
+	}
+	mood := first.PhraseMood
+	if mood == "" {
+		mood = "neutral"
+	}
+	return delivery.PhrasedReminder{
+		Decision: d,
+		Body:     first.PhraseBody,
+		Summary:  first.PhraseSummary,
+		Mood:     mood,
+	}, true
+}
+
+// reminderDeliveryGroup deterministically names one occurrence or collapsed
+// set. The next-fire instant is part of the identity so a recurring reminder's
+// later occurrence can never inherit the previous occurrence's phrase.
+func reminderDeliveryGroup(originals []store.Reminder) string {
+	ordered := append([]store.Reminder(nil), originals...)
+	sort.Slice(ordered, func(i, j int) bool {
+		if ordered[i].ID == ordered[j].ID {
+			return ordered[i].NextFireTs.Before(ordered[j].NextFireTs)
+		}
+		return ordered[i].ID < ordered[j].ID
+	})
+	h := sha256.New()
+	for _, r := range ordered {
+		_, _ = fmt.Fprintf(h, "%d:%d;", r.ID, r.NextFireTs.UnixMilli())
+	}
+	sum := h.Sum(nil)
+	return fmt.Sprintf("reminder:%x", sum[:12])
+}
+
 // savePresence writes back the bucket GatherState just resolved.
 //
 // It lives here and not in GatherState because that method holds a read-only
diff --git a/cmd/mavend/tick_reminder_delivery_test.go b/cmd/mavend/tick_reminder_delivery_test.go
new file mode 100644
index 0000000..e87edfd
--- /dev/null
+++ b/cmd/mavend/tick_reminder_delivery_test.go
@@ -0,0 +1,170 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/kami/maven/internal/delivery"
+	"github.com/kami/maven/internal/loop"
+	"github.com/kami/maven/internal/phraser"
+	"github.com/kami/maven/internal/store"
+)
+
+type reminderCountingPhraser struct {
+	phraser.Phraser
+	calls   int
+	body    string
+	summary string
+	mood    string
+}
+
+func (p *reminderCountingPhraser) PhraseReminder(_ context.Context, d loop.ReminderDecision) (delivery.PhrasedReminder, error) {
+	p.calls++
+	return delivery.PhrasedReminder{
+		Decision: d,
+		Body:     p.body,
+		Summary:  p.summary,
+		Mood:     p.mood,
+	}, nil
+}
+
+type reminderFailSink struct {
+	sends int
+}
+
+func (s *reminderFailSink) Send(_ context.Context, _ delivery.Sendable) error {
+	s.sends++
+	return errors.New("transport unavailable")
+}
+
+func newReminderDeliveryLoop(t *testing.T, st *store.Store, sink delivery.Sink, p phraser.Phraser) *tickLoop {
+	t.Helper()
+	rules := loop.DefaultRules()
+	return newTickLoop(
+		st,
+		loop.NewGatherer(st, rules),
+		delivery.NewDispatcher(delivery.Config{
+			Voice: sink, Ntfy: sink, Telegram: sink,
+			Nudges: st, Reminders: st, Outbox: st,
+		}),
+		p,
+		rules,
+		time.Second,
+		5*time.Minute,
+		0,
+		nil, nil, nil, nil,
+	)
+}
+
+func TestTickReminderRetryUsesPersistedPhraseAfterRestart(t *testing.T) {
+	st := newTestStore(t)
+	ctx := context.Background()
+	now := refNow()
+	if _, err := st.CreateReminder(ctx, now.Add(-time.Minute), `{"text":"позвонить маме"}`, ""); err != nil {
+		t.Fatal(err)
+	}
+
+	fail := &reminderFailSink{}
+	firstPhraser := &reminderCountingPhraser{
+		Phraser: phraser.NewStub(), body: "Не забудь позвонить маме.",
+		summary: "Позвонить маме", mood: "warm",
+	}
+	tl := newReminderDeliveryLoop(t, st, fail, firstPhraser)
+	tl.tick(ctx, now)
+	if firstPhraser.calls != 1 {
+		t.Fatalf("first tick phrased %d times, want 1", firstPhraser.calls)
+	}
+	rows, err := st.ListReminders(ctx, 1)
+	if err != nil || len(rows) != 1 {
+		t.Fatalf("list = %d, err=%v", len(rows), err)
+	}
+	if !rows[0].HasDeliveryPhrase() || rows[0].DeliveryAttempts != 1 {
+		t.Fatalf("failed delivery state was not persisted: %+v", rows[0])
+	}
+	if want := now.Add(store.ReminderRetryBase); !rows[0].NextAttemptTs.Equal(want) {
+		t.Fatalf("next attempt = %s, want %s", rows[0].NextAttemptTs, want)
+	}
+
+	// A normal tick inside the wait does no transport work and no model work.
+	sendsAfterFirst := fail.sends
+	tl.tick(ctx, now.Add(30*time.Second))
+	if firstPhraser.calls != 1 || fail.sends != sendsAfterFirst {
+		t.Fatalf("retry wait did work: phrase calls=%d, sends=%d (was %d)", firstPhraser.calls, fail.sends, sendsAfterFirst)
+	}
+
+	// Constructing a new loop is the daemon-restart boundary. Its phraser would
+	// say something different if called; the stored phrase must win instead.
+	success := &fakeSink{}
+	afterRestart := &reminderCountingPhraser{
+		Phraser: phraser.NewStub(), body: "WRONG NEW PHRASE", summary: "WRONG", mood: "neutral",
+	}
+	restarted := newReminderDeliveryLoop(t, st, success, afterRestart)
+	restarted.tick(ctx, now.Add(store.ReminderRetryBase))
+	if afterRestart.calls != 0 {
+		t.Fatalf("restart re-phrased the reminder %d times", afterRestart.calls)
+	}
+	if len(success.sends) != 1 {
+		t.Fatalf("retry sends = %d, want 1", len(success.sends))
+	}
+	if got := success.sends[0].Body; got != "Позвонить маме" {
+		t.Fatalf("away retry body = %q, want persisted summary", got)
+	}
+	rows, err = st.ListReminders(ctx, 1)
+	if err != nil || rows[0].Status != store.ReminderFired {
+		t.Fatalf("successful retry did not fire reminder: rows=%+v err=%v", rows, err)
+	}
+}
+
+func TestTickCollapsedReminderRetriesOnePhraseAndCompletesOriginals(t *testing.T) {
+	st := newTestStore(t)
+	ctx := context.Background()
+	now := refNow()
+	for _, text := range []string{"полить цветы", "записаться к врачу"} {
+		if _, err := st.CreateReminder(ctx, now.Add(-time.Minute), text, ""); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	fail := &reminderFailSink{}
+	firstPhraser := &reminderCountingPhraser{
+		Phraser: phraser.NewStub(), body: "У тебя два напоминания.",
+		summary: "Два напоминания", mood: "neutral",
+	}
+	newReminderDeliveryLoop(t, st, fail, firstPhraser).tick(ctx, now)
+	if firstPhraser.calls != 1 {
+		t.Fatalf("collapsed bundle phrased %d times, want 1", firstPhraser.calls)
+	}
+	rows, err := st.ListReminders(ctx, 10)
+	if err != nil || len(rows) != 2 {
+		t.Fatalf("list = %d, err=%v", len(rows), err)
+	}
+	for _, r := range rows {
+		if r.DeliveryGroup == "" || r.DeliveryGroup != rows[0].DeliveryGroup ||
+			r.PhraseBody != "У тебя два напоминания." || r.DeliveryAttempts != 1 {
+			t.Fatalf("collapsed original lost shared state: %+v", r)
+		}
+	}
+
+	success := &fakeSink{}
+	afterRestart := &reminderCountingPhraser{
+		Phraser: phraser.NewStub(), body: "WRONG", summary: "WRONG", mood: "neutral",
+	}
+	newReminderDeliveryLoop(t, st, success, afterRestart).tick(ctx, now.Add(store.ReminderRetryBase))
+	if afterRestart.calls != 0 {
+		t.Fatalf("collapsed retry re-phrased %d times", afterRestart.calls)
+	}
+	if len(success.sends) != 1 || success.sends[0].ReminderID != 0 {
+		t.Fatalf("collapsed retry sends = %+v, want one synthetic delivery", success.sends)
+	}
+	rows, err = st.ListReminders(ctx, 10)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, r := range rows {
+		if r.Status != store.ReminderFired {
+			t.Fatalf("collapsed original %d status = %q, want fired", r.ID, r.Status)
+		}
+	}
+}
diff --git a/cmd/mavend/voicewire.go b/cmd/mavend/voicewire.go
index f3e4aa8..6763776 100644
--- a/cmd/mavend/voicewire.go
+++ b/cmd/mavend/voicewire.go
@@ -377,19 +377,19 @@ func wireVoice(cfg *config.Config, coreAPI ipc.CoreAPI, phr phraser.Phraser, mem
 // degraded mode, so the seam is nil and the cascade routes with the classifier.
 func modelSeam(cfg *config.Config, resident *llm.Client) (router.Completer, *llm.Pair) {
 	if resident == nil {
-		if cfg.Workstation != nil {
+		if cfg.Workstation != nil && !cfg.Workstation.ModelDisabled {
 			log.Printf("voice: a workstation is configured but there is no resident model to floor it with — ignoring the block")
 		}
 		return nil, nil
 	}
-	if cfg.Workstation == nil {
+	if cfg.Workstation == nil || cfg.Workstation.ModelDisabled {
 		return resident, nil
 	}
 	ws := cfg.Workstation
 	remote := llm.New(ws.URL, time.Duration(ws.Timeout))
 	remote.SetToken(ws.Token)
 	if ws.Token == "" {
-		log.Printf("voice: no workstation.token — mavgpud refuses an unauthenticated request, so this reads as a card that is always busy")
+		log.Printf("voice: unauthenticated workstation model endpoint is loopback-only")
 	}
 	pair := llm.NewPair(
 		remote,
@@ -434,7 +434,7 @@ func sttSeam(cfg *config.Config, floor stt.Transcriber) (stt.Transcriber, *stt.P
 	)
 	pair.Start(context.Background())
 	if s.Token == "" {
-		log.Print("voice: the workstation transcriber has no token, so anything on the LAN can post audio to it")
+		log.Print("voice: unauthenticated workstation transcriber endpoint is loopback-only")
 	}
 	log.Printf("voice: workstation transcriber at %s, probed every %s, mavsttd as the floor",
 		s.URL, time.Duration(s.Probe))
diff --git a/cmd/mavweb/ambient.go b/cmd/mavweb/ambient.go
index 1d98b48..5d59cce 100644
--- a/cmd/mavweb/ambient.go
+++ b/cmd/mavweb/ambient.go
@@ -4,6 +4,7 @@ import (
 	"crypto/subtle"
 	"encoding/json"
 	"errors"
+	"fmt"
 	"io"
 	"log"
 	"net/http"
@@ -51,34 +52,41 @@ type ambientResp struct {
 // never registered, so it is treated as a hard failure here too.
 func handleAmbient(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, token string) {
 	if r.Method != http.MethodPost {
-		http.Error(w, "POST only", http.StatusMethodNotAllowed)
+		writeProblem(w, r, http.StatusMethodNotAllowed, problemMethodNotAllowed,
+			"POST only", nil)
 		return
 	}
 	if token == "" {
-		http.Error(w, "ambient ingest disabled (no -ambient-token)", http.StatusServiceUnavailable)
+		writeProblem(w, r, http.StatusServiceUnavailable, problemIntegrationOff,
+			"ambient ingest disabled (no -ambient-token)", nil)
 		return
 	}
 	if !ambientAuthorized(r, token) {
-		http.Error(w, "unauthorized", http.StatusUnauthorized)
+		writeProblem(w, r, http.StatusUnauthorized, problemUnauthorized,
+			"unauthorized", nil)
 		return
 	}
 	if core == nil {
-		http.Error(w, "ambient ingest disabled (no -core)", http.StatusServiceUnavailable)
+		writeProblem(w, r, http.StatusServiceUnavailable, problemCoreUnavailable,
+			"ambient ingest disabled (no -core)", nil)
 		return
 	}
 
 	var n calendar.Notification
 	body, err := io.ReadAll(io.LimitReader(r.Body, ambientMaxBody))
 	if err != nil {
-		http.Error(w, "read failed", http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"read failed", fmt.Errorf("read ambient request: %w", err))
 		return
 	}
 	if err := json.Unmarshal(body, &n); err != nil {
-		http.Error(w, "bad json", http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"bad json", fmt.Errorf("decode ambient request: %w", err))
 		return
 	}
 	if n.Posted.IsZero() {
-		writeAmbient(w, http.StatusBadRequest, ambientResp{Reason: "posted_at is required"})
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"posted_at is required", nil)
 		return
 	}
 
@@ -99,8 +107,8 @@ func handleAmbient(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, tok
 		writeAmbient(w, http.StatusOK, ambientResp{Stored: false, Key: key, Reason: "unchanged"})
 		return
 	} else if err != nil && !errors.Is(err, ipc.ErrNoFact) {
-		log.Printf("ambient: read %s: %v", key, err)
-		http.Error(w, "read failed", http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+			"read failed", fmt.Errorf("read ambient fact %q: %w", key, err))
 		return
 	}
 
@@ -116,8 +124,8 @@ func handleAmbient(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, tok
 		Source:     calendar.SourceAmbient,
 		Confidence: calendar.AmbientConfidence,
 	}); err != nil {
-		log.Printf("ambient: write %s: %v", key, err)
-		http.Error(w, "write failed", http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreWriteFailed,
+			"write failed", fmt.Errorf("write ambient fact %q: %w", key, err))
 		return
 	}
 	log.Printf("ambient: %s=%s (%s, pkg=%s)", key, val, calendar.SourceAmbient, n.Package)
diff --git a/cmd/mavweb/ambient_test.go b/cmd/mavweb/ambient_test.go
index f9ed037..87015c1 100644
--- a/cmd/mavweb/ambient_test.go
+++ b/cmd/mavweb/ambient_test.go
@@ -16,6 +16,18 @@ import (
 
 const ambientTestToken = "s3cret"
 
+func TestValidateAmbientConfig(t *testing.T) {
+	if err := validateAmbientConfig(false, ""); err != nil {
+		t.Fatalf("explicitly disabled ambient config: %v", err)
+	}
+	if err := validateAmbientConfig(true, ""); err == nil {
+		t.Fatal("enabled ambient ingest accepted an empty token")
+	}
+	if err := validateAmbientConfig(true, ambientTestToken); err != nil {
+		t.Fatalf("enabled authenticated ambient config: %v", err)
+	}
+}
+
 // ambientCore adds provenance-scoped reads to fakeCore, which the dedupe path
 // needs.
 type ambientCore struct {
diff --git a/cmd/mavweb/chat.go b/cmd/mavweb/chat.go
index 6091f5a..8657f8d 100644
--- a/cmd/mavweb/chat.go
+++ b/cmd/mavweb/chat.go
@@ -3,7 +3,7 @@ package main
 import (
 	_ "embed"
 	"errors"
-	"log"
+	"fmt"
 	"net/http"
 	"net/url"
 	"strconv"
@@ -47,7 +47,7 @@ var correctionTargets = []router.Intent{
 
 // handleChatPage renders the chat conversation page.
 func handleChatPage(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
-	if !requireCore(w, core, "chat") {
+	if !requireCore(w, r, core, "chat") {
 		return
 	}
 	msgs := []chatMsg{}
@@ -83,13 +83,14 @@ func handleChatPage(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 // denies, which is the point of that flag.
 func handleChatAPI(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, session *webauthn.PasskeySession, requireStepUp bool) {
 	if r.Method != http.MethodPost {
-		http.Error(w, "POST only", http.StatusMethodNotAllowed)
+		writeProblem(w, r, http.StatusMethodNotAllowed, problemMethodNotAllowed,
+			"POST only", nil)
 		return
 	}
-	if !requireCore(w, core, "chat") {
+	if !requireCore(w, r, core, "chat") {
 		return
 	}
-	if !stepUpGate(w, session, requireStepUp) {
+	if !stepUpGate(w, r, session, requireStepUp) {
 		return
 	}
 	text := strings.TrimSpace(r.FormValue("text"))
@@ -105,8 +106,8 @@ func handleChatAPI(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, ses
 	// which is right for a single-owner box.
 	reply, err := core.Chat(r.Context(), "web", text)
 	if err != nil {
-		log.Printf("chat api: %v", err)
-		http.Redirect(w, r, "/chat", http.StatusSeeOther)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreChangeFailed,
+			"chat failed", fmt.Errorf("run web chat turn: %w", err))
 		return
 	}
 	// The claiming query source rides back on the redirect so the page can show
@@ -138,36 +139,40 @@ func handleChatAPI(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, ses
 // id could otherwise mislabel turns he never corrected.
 func handleCorrectAPI(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, session *webauthn.PasskeySession, requireStepUp bool) {
 	if r.Method != http.MethodPost {
-		http.Error(w, "POST only", http.StatusMethodNotAllowed)
+		writeProblem(w, r, http.StatusMethodNotAllowed, problemMethodNotAllowed,
+			"POST only", nil)
 		return
 	}
-	if !requireCore(w, core, "correct") {
+	if !requireCore(w, r, core, "correct") {
 		return
 	}
-	if !stepUpGate(w, session, requireStepUp) {
+	if !stepUpGate(w, r, session, requireStepUp) {
 		return
 	}
 	id, err := strconv.ParseInt(strings.TrimSpace(r.FormValue("trace_id")), 10, 64)
 	if err != nil || id <= 0 {
-		http.Error(w, "trace_id required", http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"trace_id required", err)
 		return
 	}
 	shouldBe := strings.TrimSpace(r.FormValue("should_be"))
 	// Only one of the seven, or nothing. Free text here would put an unroutable
 	// label in the one table V-632 fits prototypes from.
 	if shouldBe != "" && !isCorrectionTarget(shouldBe) {
-		http.Error(w, "should_be must be one of the seven intents", http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"should_be must be one of the seven intents", nil)
 		return
 	}
 	if err := core.CorrectTurn(r.Context(), id, shouldBe); err != nil {
-		log.Printf("correct turn %d: %v", id, err)
 		// A turn past the retention bound is gone, and saying so is different
 		// from saying the write broke.
 		if errors.Is(err, ipc.ErrNoSuchTrace) {
-			http.Error(w, "that turn is no longer stored", http.StatusNotFound)
+			writeProblem(w, r, http.StatusNotFound, problemResourceNotFound,
+				"that turn is no longer stored", fmt.Errorf("correct turn %d: %w", id, err))
 			return
 		}
-		http.Error(w, "correction failed", http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreChangeFailed,
+			"correction failed", fmt.Errorf("correct turn %d: %w", id, err))
 		return
 	}
 	stamp := shouldBe
diff --git a/cmd/mavweb/ecosystem.go b/cmd/mavweb/ecosystem.go
index 1bb1439..e867330 100644
--- a/cmd/mavweb/ecosystem.go
+++ b/cmd/mavweb/ecosystem.go
@@ -33,17 +33,29 @@ func getEco(ctx context.Context, base, path string, out any) string {
 	}
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, base+path, nil)
 	if err != nil {
-		return err.Error()
+		log.Printf("ecosystem panel request_id=%s build %q: %v", requestIDFromContext(ctx), path, err)
+		return "invalid endpoint"
+	}
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("X-Requested-By", "mavweb")
+	// These are direct browser-surface reads rather than an action initiated in
+	// mavend, so the HTTP request ID is the natural correlation root. Calls that
+	// pass through core mint their action correlation inside mavend instead.
+	if id := requestIDFromContext(ctx); id != "" {
+		req.Header.Set("X-Correlation-ID", id)
 	}
 	resp, err := ecoClient.Do(req)
 	if err != nil {
+		log.Printf("ecosystem panel request_id=%s GET %s: %v", requestIDFromContext(ctx), path, err)
 		return "unreachable"
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode != 200 {
+		log.Printf("ecosystem panel request_id=%s GET %s: HTTP %d", requestIDFromContext(ctx), path, resp.StatusCode)
 		return fmt.Sprintf("http %d", resp.StatusCode)
 	}
 	if err := json.NewDecoder(resp.Body).Decode(out); err != nil {
+		log.Printf("ecosystem panel request_id=%s decode %s: %v", requestIDFromContext(ctx), path, err)
 		return "bad json"
 	}
 	return ""
@@ -111,7 +123,7 @@ func handleEcosystem(w http.ResponseWriter, r *http.Request, urls ecoURLs, core
 	if core == nil {
 		d.Calls.Err = "not configured"
 	} else if rows, err := core.RecentEcosystemTraces(ctx, 50); err != nil {
-		log.Printf("ecosystem traces: %v", err)
+		log.Printf("ecosystem traces request_id=%s: %v", requestIDFromContext(ctx), err)
 		d.Calls.Err = "core read failed"
 	} else {
 		d.Calls.Rows = rows
diff --git a/cmd/mavweb/events_test.go b/cmd/mavweb/events_test.go
index 0e280b2..3a40e4e 100644
--- a/cmd/mavweb/events_test.go
+++ b/cmd/mavweb/events_test.go
@@ -75,8 +75,13 @@ func TestEventsPageReportsAReadFailure(t *testing.T) {
 		t.Fatalf("status = %d, want 200 with the error rendered", w.Code)
 	}
 	body := w.Body.String()
-	if !strings.Contains(body, "journal unavailable") || !strings.Contains(body, "core is down") {
-		t.Errorf("page did not report the read failure: %s", body)
+	if !strings.Contains(body, "intake journal unavailable") ||
+		!strings.Contains(body, string(problemCoreReadFailed)) ||
+		!strings.Contains(body, "request ") {
+		t.Errorf("page did not report a traceable, sanitized read failure: %s", body)
+	}
+	if strings.Contains(body, "core is down") {
+		t.Errorf("page disclosed the internal read error: %s", body)
 	}
 	if strings.Contains(body, "nothing has arrived yet") {
 		t.Error("a failed read rendered as an empty journal")
diff --git a/cmd/mavweb/facts.go b/cmd/mavweb/facts.go
index 73a847a..525edef 100644
--- a/cmd/mavweb/facts.go
+++ b/cmd/mavweb/facts.go
@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"log"
 	"net/http"
 	"strings"
@@ -32,16 +33,18 @@ var presenceSignals = map[string]string{
 // is a marker. Only allowlisted keys are accepted (see presenceSignals).
 func handleSignal(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 	if r.Method != http.MethodPost {
-		http.Error(w, "POST only", http.StatusMethodNotAllowed)
+		writeProblem(w, r, http.StatusMethodNotAllowed, problemMethodNotAllowed,
+			"POST only", nil)
 		return
 	}
-	if !requireCore(w, core, "presence ingest") {
+	if !requireCore(w, r, core, "presence ingest") {
 		return
 	}
 	key := r.URL.Query().Get("key")
 	source, ok := presenceSignals[key]
 	if !ok {
-		http.Error(w, "unknown signal key", http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"unknown signal key", nil)
 		return
 	}
 	// kind=env: an observation about the device/surface, NOT a self-fact — a
@@ -56,8 +59,8 @@ func handleSignal(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 		Source:     source,
 		Confidence: 1.0,
 	}); err != nil {
-		log.Printf("signal %s: %v", key, err)
-		http.Error(w, "write failed", http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreWriteFailed,
+			"write failed", fmt.Errorf("write presence signal %q: %w", key, err))
 		return
 	}
 	w.WriteHeader(http.StatusNoContent)
@@ -65,29 +68,32 @@ func handleSignal(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 
 func handleRevert(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, session *webauthn.PasskeySession, requireStepUp bool) {
 	if r.Method != http.MethodPost {
-		http.Error(w, "POST only", http.StatusMethodNotAllowed)
+		writeProblem(w, r, http.StatusMethodNotAllowed, problemMethodNotAllowed,
+			"POST only", nil)
 		return
 	}
-	if !requireCore(w, core, "revert") {
+	if !requireCore(w, r, core, "revert") {
 		return
 	}
-	if !stepUpGate(w, session, requireStepUp) {
+	if !stepUpGate(w, r, session, requireStepUp) {
 		return
 	}
 
 	key := strings.TrimSpace(r.FormValue("key"))
 	if key == "" {
-		http.Error(w, "key required", http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"key required", nil)
 		return
 	}
 	newID, err := core.RevertFact(r.Context(), key)
 	if err != nil {
-		log.Printf("revert %q: %v", key, err)
 		if errors.Is(err, ipc.ErrNoFact) {
-			http.Error(w, "no fact to revert", http.StatusNotFound)
+			writeProblem(w, r, http.StatusNotFound, problemResourceNotFound,
+				"no fact to revert", fmt.Errorf("revert fact %q: %w", key, err))
 			return
 		}
-		http.Error(w, "revert failed", http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreChangeFailed,
+			"revert failed", fmt.Errorf("revert fact %q: %w", key, err))
 		return
 	}
 	log.Printf("reverted fact for key=%s, new_id=%d", key, newID)
diff --git a/cmd/mavweb/main.go b/cmd/mavweb/main.go
index e199a5b..9b01610 100644
--- a/cmd/mavweb/main.go
+++ b/cmd/mavweb/main.go
@@ -48,9 +48,14 @@ func main() {
 	hexisURL := flag.String("hexis", "", "Hexis base URL for the /ecosystem panel (empty = not configured)")
 	// Shared secret for POST /api/ambient, the notification-relay ingest that
 	// reads the work calendar as a signal instead of holding a work credential
-	// (see ambient.go). Empty ⇒ the route is not registered at all.
-	ambientToken := flag.String("ambient-token", "", "shared secret for POST /api/ambient notification ingest (empty = ingest disabled, route not registered)")
+	// (see ambient.go). Enabling and authenticating are separate on purpose: an
+	// expanded-empty secret cannot silently turn a live integration off.
+	ambientEnabled := flag.Bool("ambient-enabled", false, "enable POST /api/ambient notification ingest (requires -ambient-token)")
+	ambientToken := flag.String("ambient-token", "", "shared secret for POST /api/ambient notification ingest")
 	flag.Parse()
+	if err := validateAmbientConfig(*ambientEnabled, *ambientToken); err != nil {
+		log.Fatal(err)
+	}
 
 	var core ipc.CoreAPI
 	// swapConn — a second connection, for /models and nothing else. A model swap
@@ -129,9 +134,9 @@ func main() {
 		w.Write([]byte(*ntfyWS))
 	})
 	mux.HandleFunc("/api/signal", corePage(handleSignal))
-	// Off unless configured: no token, no route — an unconfigured ingest is not
-	// a 503 waiting to be probed, it does not exist.
-	if *ambientToken != "" {
+	// Off unless explicitly enabled: a dark ingest has no route at all, while an
+	// enabled ingest with no token was rejected before the server was built.
+	if *ambientEnabled {
 		mux.HandleFunc("/api/ambient", func(w http.ResponseWriter, r *http.Request) {
 			handleAmbient(w, r, core, *ambientToken)
 		})
@@ -251,6 +256,13 @@ func main() {
 	}
 }
 
+func validateAmbientConfig(enabled bool, token string) error {
+	if enabled && token == "" {
+		return errors.New("mavweb: ambient ingest is enabled but -ambient-token is empty")
+	}
+	return nil
+}
+
 // logUnguardedSurfaces names, at startup, what step-up would have covered had
 // WebAuthn been configured. One surface per line: these are read in a terminal
 // at the moment someone is deciding whether the box is safe to expose.
@@ -288,7 +300,7 @@ const (
 func mavwebHTTPServer(addr string, handler http.Handler) *http.Server {
 	return &http.Server{
 		Addr:              addr,
-		Handler:           handler,
+		Handler:           withRequestID(handler),
 		ReadHeaderTimeout: mavwebReadHeaderTimeout,
 		ReadTimeout:       mavwebReadTimeout,
 		IdleTimeout:       mavwebIdleTimeout,
diff --git a/cmd/mavweb/models.go b/cmd/mavweb/models.go
index 2b38bcd..2c3b77d 100644
--- a/cmd/mavweb/models.go
+++ b/cmd/mavweb/models.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	_ "embed"
 	"errors"
+	"fmt"
 	"log"
 	"net/http"
 	"strconv"
@@ -57,7 +58,8 @@ type modelsPage struct {
 // the reply. On its own connection the swap only blocks the swap.
 func handleModels(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, swapConn modelController, session *webauthn.PasskeySession, requireStepUp bool) {
 	if core == nil {
-		http.Error(w, "models disabled (no -core)", http.StatusServiceUnavailable)
+		writeProblem(w, r, http.StatusServiceUnavailable, problemCoreUnavailable,
+			"models disabled (no -core)", nil)
 		return
 	}
 	mc, ok := swapConn, swapConn != nil
@@ -65,7 +67,8 @@ func handleModels(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, swap
 		mc, ok = core.(modelController)
 	}
 	if !ok {
-		http.Error(w, "models unavailable: core connection does not support model swap", http.StatusServiceUnavailable)
+		writeProblem(w, r, http.StatusServiceUnavailable, problemModelsUnavailable,
+			"models unavailable: core connection does not support model swap", nil)
 		return
 	}
 	ctx := r.Context()
@@ -73,12 +76,14 @@ func handleModels(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, swap
 
 	if r.Method == http.MethodPost {
 		if !stepUpOK(session, requireStepUp) {
-			http.Error(w, "step-up required: assert a passkey first", http.StatusForbidden)
+			writeProblem(w, r, http.StatusForbidden, problemStepUpRequired,
+				"step-up required: assert a passkey first", nil)
 			return
 		}
 		path := strings.TrimSpace(r.FormValue("model_path"))
 		if path == "" {
-			http.Error(w, "model_path required", http.StatusBadRequest)
+			writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+				"model_path required", nil)
 			return
 		}
 		// Only the path comes off the form. n_ctx and n_gpu_layers are load
@@ -93,20 +98,26 @@ func handleModels(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, swap
 			page.Msg = "loaded " + res.Model + " (" + strconv.FormatInt(res.TookMs, 10) + "ms)"
 			log.Printf("models: swapped to %s (%s) in %dms", res.ModelPath, res.Model, res.TookMs)
 		case errors.Is(err, ipc.ErrForbidden):
-			http.Error(w, "refused: that model is not in phraser.swap_models, or step-up was not asserted", http.StatusForbidden)
+			writeProblem(w, r, http.StatusForbidden, problemModelsForbidden,
+				"refused: that model is not in phraser.swap_models, or step-up was not asserted",
+				fmt.Errorf("swap model %q: %w", path, err))
 			return
 		case errors.Is(err, ipc.ErrUnknownMethod):
-			http.Error(w, "swap not configured on this core", http.StatusServiceUnavailable)
+			writeProblem(w, r, http.StatusServiceUnavailable, problemModelsUnavailable,
+				"swap not configured on this core", fmt.Errorf("swap model %q: %w", path, err))
 			return
 		case res.NoBackend:
-			page.Err = "swap failed AND the rollback failed — no model is loaded. She is answering from templates and routing on the classifier. Try loading a model again; a restart is not needed."
-			log.Printf("models: swap to %s failed and the rollback failed, no model loaded: %v", path, err)
+			page.Err = inlineProblem(r, problemModelsUnavailable,
+				"swap failed AND the rollback failed — no model is loaded. She is answering from templates and routing on the classifier. Try loading a model again; a restart is not needed.",
+				fmt.Errorf("swap model %q and rollback: %w", path, err))
 		case res.RolledBack:
-			page.Err = "swap failed, rolled back to " + res.Model + " — she is still answering, with the old model"
-			log.Printf("models: swap to %s failed, rolled back: %v", path, err)
+			page.Err = inlineProblem(r, problemModelsUnavailable,
+				"swap failed, rolled back to "+res.Model+" — she is still answering, with the old model",
+				fmt.Errorf("swap model %q, rolled back to %q: %w", path, res.Model, err))
 		default:
-			page.Err = "swap failed: " + err.Error()
-			log.Printf("models: swap to %s failed: %v", path, err)
+			page.Err = inlineProblem(r, problemModelsUnavailable,
+				"swap failed; the current model state is shown below",
+				fmt.Errorf("swap model %q: %w", path, err))
 		}
 	}
 
@@ -115,8 +126,8 @@ func handleModels(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, swap
 		if errors.Is(err, ipc.ErrUnknownMethod) {
 			page.Off = true
 		} else {
-			log.Printf("models: status: %v", err)
-			http.Error(w, "core read failed", http.StatusBadGateway)
+			writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+				"core read failed", fmt.Errorf("read model status: %w", err))
 			return
 		}
 	}
diff --git a/cmd/mavweb/models_test.go b/cmd/mavweb/models_test.go
index 7810b5f..3882643 100644
--- a/cmd/mavweb/models_test.go
+++ b/cmd/mavweb/models_test.go
@@ -149,6 +149,27 @@ type errBrokenModel struct{}
 
 func (errBrokenModel) Error() string { return "llm: server did not start" }
 
+type errPrivateModel struct{}
+
+func (errPrivateModel) Error() string { return "exec /private/llama-server: token rejected" }
+
+func TestModels_SwapFailureIsSanitizedAndTraceable(t *testing.T) {
+	core := &fakeModelCore{
+		swapErr: errPrivateModel{},
+		status:  ipc.ModelStatusResp{Model: "qwen3", ModelPath: "/m/old.gguf"},
+	}
+	w := modelsPOST(t, core, nil, false, "/m/cpt.gguf")
+	body := w.Body.String()
+	for _, want := range []string{"swap failed", string(problemModelsUnavailable), "request "} {
+		if !strings.Contains(body, want) {
+			t.Errorf("sanitized model error missing %q:\n%s", want, body)
+		}
+	}
+	if strings.Contains(body, "/private/llama-server") || strings.Contains(body, "token rejected") {
+		t.Errorf("model page disclosed the backend error:\n%s", body)
+	}
+}
+
 func TestModels_TotalFailureDoesNotSaySheIsStillAnswering(t *testing.T) {
 	// The load failed and so did the rollback: nothing is loaded. The page used
 	// to branch on RolledBack first and render "rolled back to  — she is still
diff --git a/cmd/mavweb/notifications.go b/cmd/mavweb/notifications.go
index 97d68e5..8234a42 100644
--- a/cmd/mavweb/notifications.go
+++ b/cmd/mavweb/notifications.go
@@ -2,7 +2,7 @@ package main
 
 import (
 	_ "embed"
-	"log"
+	"fmt"
 	"net/http"
 	"strconv"
 
@@ -48,14 +48,14 @@ func deliveryRows(as []ipc.DeliveryAttempt) []deliveryRow {
 }
 
 func handleNotifications(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
-	if !requireCore(w, core, "notifications") {
+	if !requireCore(w, r, core, "notifications") {
 		return
 	}
 	ctx := r.Context()
 	nudges, err := core.RecentNudges(ctx, 50)
 	if err != nil {
-		log.Printf("notifications: %v", err)
-		http.Error(w, "notifications error: "+err.Error(), http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+			"notifications unavailable", fmt.Errorf("read recent nudges: %w", err))
 		return
 	}
 	// The outbox, on the page that already answers "what did she send".
@@ -66,7 +66,8 @@ func handleNotifications(w http.ResponseWriter, r *http.Request, core ipc.CoreAP
 	if err != nil {
 		// The nudge list is still worth showing, so this is a note on the page
 		// rather than a dead page.
-		log.Printf("notifications: delivery attempts: %v", err)
+		logProblem(r, http.StatusOK, problemCoreReadFailed,
+			"delivery attempts unavailable", fmt.Errorf("read delivery attempts: %w", err))
 	}
 	renderPage(w, notificationsTmpl, map[string]any{
 		"Nudges":   nudges,
diff --git a/cmd/mavweb/pages.go b/cmd/mavweb/pages.go
index 1fa5688..54ae644 100644
--- a/cmd/mavweb/pages.go
+++ b/cmd/mavweb/pages.go
@@ -3,8 +3,8 @@ package main
 import (
 	"cmp"
 	_ "embed"
+	"fmt"
 	"html/template"
-	"log"
 	"net/http"
 	"strings"
 	"time"
@@ -73,7 +73,7 @@ var voiceTmpl = parsePage("voice", voiceHTML, nil)
 var ecosystemTmpl = parsePage("ecosystem", ecosystemHTML, nil)
 
 func handleDash(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
-	if !requireCore(w, core, "dash") {
+	if !requireCore(w, r, core, "dash") {
 		return
 	}
 	ctx := r.Context()
@@ -82,8 +82,8 @@ func handleDash(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 	nudges, err3 := core.RecentNudges(ctx, 50)
 	notes, err4 := core.RecentNotes(ctx, 50)
 	if err := cmp.Or(err1, err2, err3, err4); err != nil {
-		log.Printf("dash: %v", err)
-		http.Error(w, "core read failed", http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+			"core read failed", fmt.Errorf("read dashboard: %w", err))
 		return
 	}
 	renderPage(w, dashTmpl, struct {
@@ -95,13 +95,13 @@ func handleDash(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 }
 
 func handleHistory(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
-	if !requireCore(w, core, "history") {
+	if !requireCore(w, r, core, "history") {
 		return
 	}
 	facts, err := core.RecentFacts(r.Context(), 200)
 	if err != nil {
-		log.Printf("history: %v", err)
-		http.Error(w, "core read failed", http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+			"core read failed", fmt.Errorf("read fact history: %w", err))
 		return
 	}
 	renderPage(w, historyTmpl, struct {
@@ -110,13 +110,13 @@ func handleHistory(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 }
 
 func handleTrace(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
-	if !requireCore(w, core, "trace") {
+	if !requireCore(w, r, core, "trace") {
 		return
 	}
 	trace, err := core.TickTrace(r.Context())
 	if err != nil {
-		log.Printf("trace: %v", err)
-		http.Error(w, "core read failed", http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+			"core read failed", fmt.Errorf("read tick trace: %w", err))
 		return
 	}
 	// The turn records share this page rather than getting one of their own
@@ -127,7 +127,8 @@ func handleTrace(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 	// deploy.
 	turns, err := core.TurnDecisions(r.Context(), 25)
 	if err != nil {
-		log.Printf("trace: turn decisions: %v", err)
+		logProblem(r, http.StatusOK, problemCoreReadFailed,
+			"turn decisions unavailable", fmt.Errorf("read turn decisions: %w", err))
 	}
 	renderPage(w, traceTmpl, traceData{Tick: trace, Turns: turns})
 }
@@ -149,14 +150,14 @@ type morningView struct {
 }
 
 func handleMorning(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
-	if !requireCore(w, core, "morning") {
+	if !requireCore(w, r, core, "morning") {
 		return
 	}
 	ctx := r.Context()
 	status, err := core.MorningStatus(ctx)
 	if err != nil {
-		log.Printf("morning: %v", err)
-		http.Error(w, "core read failed", http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+			"core read failed", fmt.Errorf("read morning status: %w", err))
 		return
 	}
 	view := morningView{Routines: status}
@@ -165,8 +166,8 @@ func handleMorning(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 	// down with it — the page degrades to what it had before.
 	plan, err := core.DayPlan(ctx)
 	if err != nil {
-		log.Printf("morning: day plan: %v", err)
-		view.PlanErr = err.Error()
+		view.PlanErr = inlineProblem(r, problemCoreReadFailed,
+			"day plan unavailable", fmt.Errorf("read day plan: %w", err))
 	} else {
 		view.Plan = &plan
 	}
@@ -186,14 +187,14 @@ type eventsView struct {
 const eventsPageLimit = 200
 
 func handleEvents(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
-	if !requireCore(w, core, "intake journal") {
+	if !requireCore(w, r, core, "intake journal") {
 		return
 	}
 	var view eventsView
 	evs, err := core.RecentEvents(r.Context(), eventsPageLimit)
 	if err != nil {
-		log.Printf("events: %v", err)
-		view.Err = err.Error()
+		view.Err = inlineProblem(r, problemCoreReadFailed,
+			"intake journal unavailable", fmt.Errorf("read intake journal: %w", err))
 	} else {
 		view.Events = evs
 	}
diff --git a/cmd/mavweb/problems.go b/cmd/mavweb/problems.go
new file mode 100644
index 0000000..c947fc8
--- /dev/null
+++ b/cmd/mavweb/problems.go
@@ -0,0 +1,118 @@
+package main
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+)
+
+// problemCode is the stable, low-cardinality name a client can key on. The
+// request ID identifies one occurrence; the code identifies the class of
+// failure without exposing the wrapped implementation error.
+type problemCode string
+
+const (
+	problemMethodNotAllowed  problemCode = "request.method_not_allowed"
+	problemInvalidRequest    problemCode = "request.invalid"
+	problemPayloadTooLarge   problemCode = "request.payload_too_large"
+	problemUnauthorized      problemCode = "auth.unauthorized"
+	problemStepUpRequired    problemCode = "auth.step_up_required"
+	problemResourceNotFound  problemCode = "resource.not_found"
+	problemIntegrationOff    problemCode = "integration.disabled"
+	problemCoreUnavailable   problemCode = "core.unavailable"
+	problemCoreReadFailed    problemCode = "core.read_failed"
+	problemCoreWriteFailed   problemCode = "core.write_failed"
+	problemCoreChangeFailed  problemCode = "core.change_failed"
+	problemToolsChange       problemCode = "tools.change_failed"
+	problemRoutinesChange    problemCode = "routines.change_failed"
+	problemModelsUnavailable problemCode = "models.unavailable"
+	problemModelsForbidden   problemCode = "models.forbidden"
+	problemWebAuthnBegin     problemCode = "webauthn.begin_failed"
+	problemWebAuthnFinish    problemCode = "webauthn.finish_failed"
+	problemWebAuthnStepUp    problemCode = "webauthn.step_up_failed"
+	problemVoiceUnavailable  problemCode = "voice.unavailable"
+	problemVoiceTransport    problemCode = "voice.transport_failed"
+	problemVoiceResponse     problemCode = "voice.response_failed"
+)
+
+type requestIDKey struct{}
+
+// problemLogger is separate from the package-wide logger so the contract test
+// can capture exactly one problem line without redirecting unrelated output.
+var problemLogger = log.New(os.Stderr, "", log.LstdFlags)
+
+// problemResponse is the one non-success envelope returned by mavweb. Error is
+// deliberately a public message, never err.Error(). Code is stable across
+// occurrences; request_id joins this answer to the full server-side log line.
+type problemResponse struct {
+	Error     string      `json:"error"`
+	Code      problemCode `json:"code"`
+	RequestID string      `json:"request_id"`
+}
+
+// withRequestID mints the request identifier at the HTTP boundary. A caller's
+// X-Request-ID is ignored: accepting it would let an untrusted client forge a
+// link to another request's logs. The generated ID is also returned on success,
+// which lets an operator start from any surprising response, not errors alone.
+func withRequestID(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		id := rand.Text()
+		w.Header().Set("X-Request-ID", id)
+		ctx := context.WithValue(r.Context(), requestIDKey{}, id)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func requestIDFromContext(ctx context.Context) string {
+	id, _ := ctx.Value(requestIDKey{}).(string)
+	return id
+}
+
+func problemRequestID(r *http.Request) string {
+	id := requestIDFromContext(r.Context())
+	if id == "" {
+		id = rand.Text()
+	}
+	return id
+}
+
+func logProblem(r *http.Request, status int, code problemCode, public string, err error) string {
+	id := problemRequestID(r)
+	if err == nil {
+		err = errors.New(public)
+	}
+	problemLogger.Printf("mavweb problem request_id=%s code=%s status=%d method=%s path=%q: %v",
+		id, code, status, r.Method, r.URL.Path, err)
+	return id
+}
+
+// inlineProblem preserves a useful partial page when one panel fails, while
+// applying the same disclosure and correlation rules as an HTTP problem.
+func inlineProblem(r *http.Request, code problemCode, public string, err error) string {
+	id := logProblem(r, http.StatusOK, code, public, err)
+	return fmt.Sprintf("%s (code %s, request %s)", public, code, id)
+}
+
+// writeProblem is the only mavweb HTTP error writer. The wrapped error is
+// logged in full and only the explicit public message, stable code and request
+// ID cross the HTTP boundary.
+func writeProblem(w http.ResponseWriter, r *http.Request, status int, code problemCode, public string, err error) {
+	// Unit-level handlers and embedders may call a handler without installing
+	// the server middleware. They still get the same traceable contract.
+	id := logProblem(r, status, code, public, err)
+	w.Header().Set("X-Request-ID", id)
+
+	w.Header().Set("Content-Type", "application/problem+json; charset=utf-8")
+	w.Header().Set("Cache-Control", "no-store")
+	w.WriteHeader(status)
+	// A failed client connection leaves nowhere useful to report an encoder
+	// error; the full problem is already in the server log before this write.
+	_ = json.NewEncoder(w).Encode(problemResponse{
+		Error: public, Code: code, RequestID: id,
+	})
+}
diff --git a/cmd/mavweb/problems_test.go b/cmd/mavweb/problems_test.go
new file mode 100644
index 0000000..cf86344
--- /dev/null
+++ b/cmd/mavweb/problems_test.go
@@ -0,0 +1,135 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"io"
+	"log"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestWriteProblemSanitizesAndCorrelates(t *testing.T) {
+	var logs bytes.Buffer
+	old := problemLogger
+	problemLogger = logForTest(&logs)
+	t.Cleanup(func() { problemLogger = old })
+
+	const id = "TESTREQUESTID"
+	r := httptest.NewRequest(http.MethodPost, "/tools", nil)
+	r = r.WithContext(context.WithValue(r.Context(), requestIDKey{}, id))
+	w := httptest.NewRecorder()
+	internal := errors.New("dial unix /run/private/mavend.sock: bearer secret-token")
+	writeProblem(w, r, http.StatusBadGateway, problemToolsChange, "enable failed", internal)
+
+	if w.Code != http.StatusBadGateway {
+		t.Fatalf("status = %d, want 502", w.Code)
+	}
+	if got := w.Header().Get("X-Request-ID"); got != id {
+		t.Fatalf("X-Request-ID = %q, want %q", got, id)
+	}
+	if got := w.Header().Get("Content-Type"); !strings.HasPrefix(got, "application/problem+json") {
+		t.Fatalf("Content-Type = %q", got)
+	}
+	var got problemResponse
+	if err := json.Unmarshal(w.Body.Bytes(), &got); err != nil {
+		t.Fatalf("decode problem: %v", err)
+	}
+	if got.Error != "enable failed" || got.Code != problemToolsChange || got.RequestID != id {
+		t.Fatalf("problem = %+v", got)
+	}
+	if strings.Contains(w.Body.String(), "private") || strings.Contains(w.Body.String(), "secret-token") {
+		t.Fatalf("HTTP response disclosed the wrapped error: %s", w.Body.String())
+	}
+	for _, want := range []string{id, string(problemToolsChange), internal.Error()} {
+		if !strings.Contains(logs.String(), want) {
+			t.Errorf("server log missing %q: %s", want, logs.String())
+		}
+	}
+}
+
+func TestRequestIDMiddlewareMintsAndIgnoresCallerID(t *testing.T) {
+	var seen string
+	h := withRequestID(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		seen = requestIDFromContext(r.Context())
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	r := httptest.NewRequest(http.MethodGet, "/api/ping", nil)
+	r.Header.Set("X-Request-ID", "caller-chosen")
+	w := httptest.NewRecorder()
+	h.ServeHTTP(w, r)
+
+	if seen == "" || seen == "caller-chosen" {
+		t.Fatalf("request ID = %q; want a server-generated value", seen)
+	}
+	if got := w.Header().Get("X-Request-ID"); got != seen {
+		t.Fatalf("response request ID = %q, context ID = %q", got, seen)
+	}
+}
+
+func TestEcosystemPanelPropagatesRequestID(t *testing.T) {
+	const id = "WEBREQUESTCORRELATION"
+	var correlation, requester string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		correlation = r.Header.Get("X-Correlation-ID")
+		requester = r.Header.Get("X-Requested-By")
+		_, _ = io.WriteString(w, `[]`)
+	}))
+	defer srv.Close()
+	ctx := context.WithValue(context.Background(), requestIDKey{}, id)
+	var rows []ecoEntity
+	if got := getEco(ctx, srv.URL, "/entities", &rows); got != "" {
+		t.Fatalf("getEco error = %q", got)
+	}
+	if correlation != id || requester != "mavweb" {
+		t.Fatalf("correlation = %q, requester = %q", correlation, requester)
+	}
+}
+
+// The contract is architectural, not a convention people must remember. Keep
+// a syntax-level guard so a new handler cannot bypass writeProblem by adding
+// another http.Error call.
+func TestProductionHandlersUseOneProblemWriter(t *testing.T) {
+	entries, err := os.ReadDir(".")
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, entry := range entries {
+		name := entry.Name()
+		if entry.IsDir() || !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") {
+			continue
+		}
+		file, err := parser.ParseFile(token.NewFileSet(), filepath.Clean(name), nil, 0)
+		if err != nil {
+			t.Fatalf("parse %s: %v", name, err)
+		}
+		ast.Inspect(file, func(n ast.Node) bool {
+			call, ok := n.(*ast.CallExpr)
+			if !ok {
+				return true
+			}
+			sel, ok := call.Fun.(*ast.SelectorExpr)
+			if !ok || sel.Sel.Name != "Error" {
+				return true
+			}
+			pkg, ok := sel.X.(*ast.Ident)
+			if ok && pkg.Name == "http" {
+				t.Errorf("%s contains http.Error; use writeProblem", name)
+			}
+			return true
+		})
+	}
+}
+
+func logForTest(w io.Writer) *log.Logger {
+	return log.New(w, "", 0)
+}
diff --git a/cmd/mavweb/reminders.go b/cmd/mavweb/reminders.go
index b953ac6..6536680 100644
--- a/cmd/mavweb/reminders.go
+++ b/cmd/mavweb/reminders.go
@@ -3,7 +3,7 @@ package main
 import (
 	_ "embed"
 	"encoding/json"
-	"log"
+	"fmt"
 	"net/http"
 	"strings"
 
@@ -26,6 +26,7 @@ type reminderRow struct {
 	Created string
 	Fires   string
 	Status  string
+	Detail  string
 	Text    string
 }
 
@@ -50,10 +51,19 @@ func reminderText(payload string) string {
 func reminderRows(rs []ipc.Reminder) []reminderRow {
 	out := make([]reminderRow, 0, len(rs))
 	for _, r := range rs {
+		status := r.Status
+		detail := ""
+		if !r.DeliveryBlockedTs.IsZero() {
+			status = "blocked"
+			detail = r.DeliveryBlockedError
+		} else if r.DeliveryAttempts > 0 && !r.NextAttemptTs.IsZero() {
+			detail = "retry " + r.NextAttemptTs.Local().Format("02 Jan 15:04")
+		}
 		out = append(out, reminderRow{
 			Created: r.CreatedTs.Local().Format("02 Jan 15:04"),
 			Fires:   r.FireTs.Local().Format("02 Jan 15:04"),
-			Status:  r.Status,
+			Status:  status,
+			Detail:  detail,
 			Text:    reminderText(r.Payload),
 		})
 	}
@@ -61,13 +71,13 @@ func reminderRows(rs []ipc.Reminder) []reminderRow {
 }
 
 func handleReminders(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
-	if !requireCore(w, core, "reminders") {
+	if !requireCore(w, r, core, "reminders") {
 		return
 	}
 	reminders, err := core.ListReminders(r.Context(), 50)
 	if err != nil {
-		log.Printf("reminders: %v", err)
-		http.Error(w, "reminders error: "+err.Error(), http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+			"reminders unavailable", fmt.Errorf("list reminders: %w", err))
 		return
 	}
 	renderPage(w, remindersTmpl, map[string]any{"Reminders": reminderRows(reminders)})
diff --git a/cmd/mavweb/reminders.html b/cmd/mavweb/reminders.html
index e28ef22..7bdbb20 100644
--- a/cmd/mavweb/reminders.html
+++ b/cmd/mavweb/reminders.html
@@ -5,7 +5,7 @@
 {{range .Reminders}}<tr>
 <td class=hint>{{.Created}}</td>
 <td>{{.Fires}}</td>
-<td><span class="badge {{.Status}}">{{.Status}}</span></td>
+<td><span class="badge {{.Status}}">{{.Status}}</span>{{if .Detail}}<div class=hint>{{.Detail}}</div>{{end}}</td>
 <td class=text-max>{{.Text}}</td>
 </tr>{{end}}</table></div>
 {{else}}<div class=empty>
diff --git a/cmd/mavweb/reminders_test.go b/cmd/mavweb/reminders_test.go
index 0fa4384..3e5e16b 100644
--- a/cmd/mavweb/reminders_test.go
+++ b/cmd/mavweb/reminders_test.go
@@ -31,6 +31,19 @@ func TestReminderRowsUnwrapAndLocalise(t *testing.T) {
 	}
 }
 
+func TestReminderRowsExposeBlockedDelivery(t *testing.T) {
+	blocked := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+	rows := reminderRows([]ipc.Reminder{{
+		Status:               "pending",
+		Payload:              `{"text":"позвонить врачу"}`,
+		DeliveryBlockedTs:    blocked,
+		DeliveryBlockedError: "ntfy credentials rejected",
+	}})
+	if len(rows) != 1 || rows[0].Status != "blocked" || rows[0].Detail != "ntfy credentials rejected" {
+		t.Fatalf("blocked reminder is not visible: %+v", rows)
+	}
+}
+
 // A payload that is not the envelope is his own words, so it is shown as it is.
 func TestReminderTextKeepsPlainPayload(t *testing.T) {
 	for _, tc := range []struct{ in, want string }{
diff --git a/cmd/mavweb/routines.go b/cmd/mavweb/routines.go
index 1ca6db3..22f13b9 100644
--- a/cmd/mavweb/routines.go
+++ b/cmd/mavweb/routines.go
@@ -5,7 +5,6 @@ import (
 	_ "embed"
 	"errors"
 	"fmt"
-	"log"
 	"net/http"
 	"strconv"
 	"strings"
@@ -41,7 +40,7 @@ type routineView struct {
 // gated — it only ever removes a reason to speak, so the worst a weaker caller
 // can do is make maven quieter.
 func handleRoutines(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, session *webauthn.PasskeySession, requireStepUp bool) {
-	if !requireCore(w, core, "routines") {
+	if !requireCore(w, r, core, "routines") {
 		return
 	}
 	ctx := r.Context()
@@ -54,8 +53,8 @@ func handleRoutines(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, se
 	}
 	proposed, err := core.ListProposedRoutines(ctx)
 	if err != nil {
-		log.Printf("routines: list: %v", err)
-		http.Error(w, "routines error: "+err.Error(), http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+			"routines unavailable", fmt.Errorf("list proposed routines: %w", err))
 		return
 	}
 	renderPage(w, routinesTmpl, struct {
@@ -76,44 +75,45 @@ func applyRoutinePost(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI,
 	// already the step-up-gated surface for this table, and a second gated
 	// surface is a second thing to get wrong.
 	if action == "seed" {
-		if !stepUpGate(w, session, requireStepUp) {
+		if !stepUpGate(w, r, session, requireStepUp) {
 			return "", false
 		}
 		out, err := seedRoutineEvent(ctx, core, r)
 		if err != nil {
-			log.Printf("routines: seed: %v", err)
-			http.Error(w, "seed failed: "+err.Error(), http.StatusBadGateway)
+			writeProblem(w, r, http.StatusBadGateway, problemRoutinesChange,
+				"seed failed", fmt.Errorf("seed routine event: %w", err))
 			return "", false
 		}
 		return out, true
 	}
 
-	idStr := r.FormValue("id")
-	var rid int64
-	if n, _ := fmt.Sscanf(idStr, "%d", &rid); n != 1 {
-		http.Error(w, "invalid id", http.StatusBadRequest)
+	rid, err := strconv.ParseInt(strings.TrimSpace(r.FormValue("id")), 10, 64)
+	if err != nil || rid <= 0 {
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"invalid id", err)
 		return "", false
 	}
 	switch action {
 	case "accept":
-		if !stepUpGate(w, session, requireStepUp) {
+		if !stepUpGate(w, r, session, requireStepUp) {
 			return "", false
 		}
 		if err := acceptRoutine(ctx, core, rid); err != nil {
-			log.Printf("routines: accept %d: %v", rid, err)
-			http.Error(w, "accept failed: "+err.Error(), http.StatusBadGateway)
+			writeProblem(w, r, http.StatusBadGateway, problemRoutinesChange,
+				"accept failed", fmt.Errorf("accept routine %d: %w", rid, err))
 			return "", false
 		}
 		return "accepted routine — maven will remind you", true
 	case "dismiss":
 		if err := core.DismissProposedRoutine(ctx, rid); err != nil {
-			log.Printf("routines: dismiss %d: %v", rid, err)
-			http.Error(w, "dismiss failed: "+err.Error(), http.StatusBadGateway)
+			writeProblem(w, r, http.StatusBadGateway, problemRoutinesChange,
+				"dismiss failed", fmt.Errorf("dismiss routine %d: %w", rid, err))
 			return "", false
 		}
 		return "dismissed routine", true
 	default:
-		http.Error(w, "unknown action", http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"unknown action", nil)
 		return "", false
 	}
 }
diff --git a/cmd/mavweb/shell.go b/cmd/mavweb/shell.go
index 3e18a6e..4b19457 100644
--- a/cmd/mavweb/shell.go
+++ b/cmd/mavweb/shell.go
@@ -159,9 +159,10 @@ func renderPage(w http.ResponseWriter, t *template.Template, data any) {
 // requireCore answers whether the surface has a core to read. mavweb runs
 // without -core (voice-only), and every page that needs mavend says so with a
 // 503 naming itself rather than a blank error.
-func requireCore(w http.ResponseWriter, core ipc.CoreAPI, surface string) bool {
+func requireCore(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, surface string) bool {
 	if core == nil {
-		http.Error(w, surface+" disabled (no -core)", http.StatusServiceUnavailable)
+		writeProblem(w, r, http.StatusServiceUnavailable, problemCoreUnavailable,
+			surface+" disabled (no -core)", nil)
 		return false
 	}
 	return true
@@ -169,11 +170,12 @@ func requireCore(w http.ResponseWriter, core ipc.CoreAPI, surface string) bool {
 
 // stepUpGate reports whether the caller may proceed through the AuthStepUp
 // gate, writing the 403 itself when it may not. See stepUpOK for the policy.
-func stepUpGate(w http.ResponseWriter, session *webauthn.PasskeySession, requireStepUp bool) bool {
+func stepUpGate(w http.ResponseWriter, r *http.Request, session *webauthn.PasskeySession, requireStepUp bool) bool {
 	if stepUpOK(session, requireStepUp) {
 		return true
 	}
-	http.Error(w, "step-up required: assert a passkey first", http.StatusForbidden)
+	writeProblem(w, r, http.StatusForbidden, problemStepUpRequired,
+		"step-up required: assert a passkey first", nil)
 	return false
 }
 
diff --git a/cmd/mavweb/tasks.go b/cmd/mavweb/tasks.go
index 8122228..fb8ec7a 100644
--- a/cmd/mavweb/tasks.go
+++ b/cmd/mavweb/tasks.go
@@ -5,7 +5,6 @@ import (
 	_ "embed"
 	"errors"
 	"fmt"
-	"log"
 	"net/http"
 	"strconv"
 	"strings"
@@ -88,7 +87,7 @@ func rowOf(t ipc.Task) taskRow {
 // from something she read into work he owns. That review step is why derived
 // tasks are captured as candidates in the first place.
 func handleTasks(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
-	if !requireCore(w, core, "tasks") {
+	if !requireCore(w, r, core, "tasks") {
 		return
 	}
 	ctx := r.Context()
@@ -97,15 +96,14 @@ func handleTasks(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 		var err error
 		msg, err = applyTaskPost(ctx, core, r)
 		if err != nil {
-			log.Printf("tasks: %v", err)
-			errMsg = err.Error()
+			errMsg = inlineProblem(r, problemCoreChangeFailed, taskPublicMessage(err), err)
 		}
 	}
 
 	all, err := core.ListTasks(ctx, "")
 	if err != nil {
-		log.Printf("tasks: list: %v", err)
-		http.Error(w, "tasks error: "+err.Error(), http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+			"tasks unavailable", fmt.Errorf("list tasks: %w", err))
 		return
 	}
 	// Live rows are ordered by the same ranker the spoken list uses, so the page
@@ -162,6 +160,39 @@ func handleTasks(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
 	}{msg, errMsg, tasks.Stalls(live, now()), cands, open, resolved, resolvedTotal > len(resolved)})
 }
 
+// taskInputError is a form/domain refusal safe to show back to the owner. IPC,
+// storage and transport errors never use this type and therefore receive the
+// generic task failure text plus a request reference.
+type taskInputError struct{ message string }
+
+func (e *taskInputError) Error() string { return e.message }
+
+func taskInput(message string) error { return &taskInputError{message: message} }
+
+func taskInputf(format string, args ...any) error {
+	return &taskInputError{message: fmt.Sprintf(format, args...)}
+}
+
+type taskPartialError struct {
+	public string
+	err    error
+}
+
+func (e *taskPartialError) Error() string { return e.public + ": " + e.err.Error() }
+func (e *taskPartialError) Unwrap() error { return e.err }
+
+func taskPublicMessage(err error) string {
+	var input *taskInputError
+	if errors.As(err, &input) {
+		return input.message
+	}
+	var partial *taskPartialError
+	if errors.As(err, &partial) {
+		return partial.public
+	}
+	return "task update failed"
+}
+
 // applyTaskPost performs one write and returns the message to show. A bad
 // request returns an error, which the page renders inline rather than as a
 // bare 400 — this is a form surface, not an API.
@@ -170,7 +201,7 @@ func applyTaskPost(ctx context.Context, core ipc.CoreAPI, r *http.Request) (stri
 	if action == "add" {
 		text := strings.TrimSpace(r.FormValue("text"))
 		if text == "" {
-			return "", errors.New("empty task text")
+			return "", taskInput("empty task text")
 		}
 		req := ipc.CaptureTaskReq{Text: text, Source: "tap:web", Status: "open", Ts: now()}
 		wgt, err := formWeight(r)
@@ -198,7 +229,7 @@ func applyTaskPost(ctx context.Context, core ipc.CoreAPI, r *http.Request) (stri
 
 	id, err := strconv.ParseInt(r.FormValue("id"), 10, 64)
 	if err != nil {
-		return "", errors.New("invalid id")
+		return "", taskInput("invalid id")
 	}
 
 	if action == "promote" {
@@ -214,7 +245,7 @@ func applyTaskPost(ctx context.Context, core ipc.CoreAPI, r *http.Request) (stri
 		// is not editable here: that ladder is one-way and has its own buttons.
 		text := strings.TrimSpace(r.FormValue("text"))
 		if text == "" {
-			return "", errors.New("empty task text")
+			return "", taskInput("empty task text")
 		}
 		wgt, err := formWeight(r)
 		if err != nil {
@@ -230,9 +261,9 @@ func applyTaskPost(ctx context.Context, core ipc.CoreAPI, r *http.Request) (stri
 		case errors.Is(err, ipc.ErrTaskDuplicate):
 			// Naming the collision instead of merging: two live rows carry two
 			// provenances, and picking one is not the page's call.
-			return "", errors.New("another open task already says this — drop one of the two")
+			return "", taskInput("another open task already says this — drop one of the two")
 		case errors.Is(err, ipc.ErrTaskResolved):
-			return "", errors.New("a resolved task keeps the text it was finished under")
+			return "", taskInput("a resolved task keeps the text it was finished under")
 		default:
 			return "", err
 		}
@@ -247,7 +278,7 @@ func applyTaskPost(ctx context.Context, core ipc.CoreAPI, r *http.Request) (stri
 	case "drop":
 		status, msg = "dropped", "dropped task"
 	default:
-		return "", fmt.Errorf("unknown action %q", action)
+		return "", taskInputf("unknown action %q", action)
 	}
 	if err := core.SetTaskStatus(ctx, id, status, now(), "tap:web"); err != nil {
 		return "", statusWriteErr(err)
@@ -257,7 +288,7 @@ func applyTaskPost(ctx context.Context, core ipc.CoreAPI, r *http.Request) (stri
 
 // errNoDoneWhen — the refusal has to name what is missing, or the button looks
 // broken. The field it asks for arrives with the intake form (Vikunja #511).
-var errNoDoneWhen = errors.New("write a definition of done before confirming this candidate")
+var errNoDoneWhen = taskInput("write a definition of done before confirming this candidate")
 
 // statusWriteErr translates a SetTaskStatus failure into what the page says.
 func statusWriteErr(err error) error {
@@ -281,11 +312,11 @@ func statusWriteErr(err error) error {
 func promoteCandidate(ctx context.Context, core ipc.CoreAPI, r *http.Request, id int64) (string, error) {
 	doneWhen := strings.TrimSpace(r.FormValue("done_when"))
 	if doneWhen == "" {
-		return "", errors.New("write a definition of done — what has to be true for this to be finished")
+		return "", taskInput("write a definition of done — what has to be true for this to be finished")
 	}
 	text := strings.TrimSpace(r.FormValue("text"))
 	if text == "" {
-		return "", errors.New("empty task text")
+		return "", taskInput("empty task text")
 	}
 	due, err := formDue(r, now())
 	if err != nil {
@@ -326,7 +357,7 @@ func promoteCandidate(ctx context.Context, core ipc.CoreAPI, r *http.Request, id
 	if _, err := core.CreateReminder(ctx, fire, text, ""); err != nil {
 		// The task IS promoted; only the reminder failed. Saying "confirmed"
 		// and nothing else would leave him expecting a nudge that will not come.
-		return "", fmt.Errorf("confirmed, but the reminder did not save: %w", err)
+		return "", &taskPartialError{public: "task confirmed, but the reminder did not save", err: err}
 	}
 	return "confirmed, and maven will remind you that morning", nil
 }
@@ -343,15 +374,15 @@ func resolveBlocker(ctx context.Context, core ipc.CoreAPI, field string) (string
 	ref, err := core.ResolveEntity(ctx, name, []string{"person"})
 	switch {
 	case errors.Is(err, ipc.ErrNotImplemented):
-		return "", errors.New("no identity service here, so blocked-on cannot be stored — leave it empty")
+		return "", taskInput("no identity service here, so blocked-on cannot be stored — leave it empty")
 	case errors.Is(err, ipc.ErrNoEntity):
-		return "", fmt.Errorf("nexus does not know %q", name)
+		return "", taskInputf("nexus does not know %q", name)
 	case err != nil:
 		return "", fmt.Errorf("resolving %q: %w", name, err)
 	case ref.Ambiguous:
 		// Asking, not picking: a task blocked on the wrong person is a
 		// mistake nobody can see afterwards.
-		return "", fmt.Errorf("%q matches %s — say which", name, strings.Join(ref.Candidates, ", "))
+		return "", taskInputf("%q matches %s — say which", name, strings.Join(ref.Candidates, ", "))
 	}
 	return ref.ID, nil
 }
@@ -366,7 +397,7 @@ func formWeight(r *http.Request) (int, error) {
 	}
 	wgt, err := strconv.Atoi(v)
 	if err != nil || wgt < 0 {
-		return 0, fmt.Errorf("bad weight %q", v)
+		return 0, taskInputf("bad weight %q", v)
 	}
 	if wgt > tasks.MaxWeight {
 		wgt = tasks.MaxWeight
@@ -383,7 +414,7 @@ func formDue(r *http.Request, now time.Time) (*time.Time, error) {
 	}
 	due, err := time.ParseInLocation("2006-01-02", d, now.Location())
 	if err != nil {
-		return nil, fmt.Errorf("bad due date %q", d)
+		return nil, taskInputf("bad due date %q", d)
 	}
 	return &due, nil
 }
diff --git a/cmd/mavweb/tasks_test.go b/cmd/mavweb/tasks_test.go
index 3f86f1c..b2fe6c1 100644
--- a/cmd/mavweb/tasks_test.go
+++ b/cmd/mavweb/tasks_test.go
@@ -191,6 +191,24 @@ func TestHandleTasksRejectsBadPost(t *testing.T) {
 	}
 }
 
+func TestHandleTasksSanitizesCoreWriteFailure(t *testing.T) {
+	core := &fakeTaskCore{captureErr: fmt.Errorf("sqlite /private/maven.db: key material rejected")}
+	form := url.Values{"action": {"add"}, "text": {"что-то"}}
+	req := httptest.NewRequest(http.MethodPost, "/tasks", strings.NewReader(form.Encode()))
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	rec := httptest.NewRecorder()
+	handleTasks(rec, req, core)
+	body := rec.Body.String()
+	for _, want := range []string{"task update failed", string(problemCoreChangeFailed), "request "} {
+		if !strings.Contains(body, want) {
+			t.Errorf("sanitized task error missing %q: %s", want, body)
+		}
+	}
+	if strings.Contains(body, "/private/maven.db") || strings.Contains(body, "key material") {
+		t.Errorf("task page disclosed the core error: %s", body)
+	}
+}
+
 func TestHandleTasksNoCore(t *testing.T) {
 	rec := httptest.NewRecorder()
 	handleTasks(rec, httptest.NewRequest(http.MethodGet, "/tasks", nil), nil)
diff --git a/cmd/mavweb/tools.go b/cmd/mavweb/tools.go
index 5a445e9..6a96e52 100644
--- a/cmd/mavweb/tools.go
+++ b/cmd/mavweb/tools.go
@@ -3,8 +3,8 @@ package main
 import (
 	"cmp"
 	_ "embed"
+	"fmt"
 	"html/template"
-	"log"
 	"net/http"
 	"strings"
 	"time"
@@ -32,13 +32,13 @@ var toolsTmpl = parsePage("tools", toolsHTML, template.FuncMap{
 // shell-word parsing; the box owner controls this input, quote a wrapper script
 // if an arg needs spaces).
 func handleTools(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, session *webauthn.PasskeySession, requireStepUp bool) {
-	if !requireCore(w, core, "tools") {
+	if !requireCore(w, r, core, "tools") {
 		return
 	}
 	ctx := r.Context()
 	var msg string
 	if r.Method == http.MethodPost {
-		if !stepUpGate(w, session, requireStepUp) {
+		if !stepUpGate(w, r, session, requireStepUp) {
 			return
 		}
 		action := r.FormValue("action")
@@ -49,54 +49,59 @@ func handleTools(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, sessi
 			cmd := strings.Fields(r.FormValue("cmd"))
 			destructive := r.FormValue("destructive") != ""
 			if name == "" || len(cmd) == 0 {
-				http.Error(w, "name and cmd required", http.StatusBadRequest)
+				writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+					"name and cmd required", nil)
 				return
 			}
 			if err := core.EnableTool(ctx, name, cmd, destructive, scope, time.Now()); err != nil {
-				log.Printf("tools: enable %q: %v", name, err)
-				http.Error(w, "enable failed: "+err.Error(), http.StatusBadGateway)
+				writeProblem(w, r, http.StatusBadGateway, problemToolsChange,
+					"enable failed", fmt.Errorf("enable tool %q: %w", name, err))
 				return
 			}
 			msg = "enabled " + name
 		case "disable":
 			if name == "" {
-				http.Error(w, "name required", http.StatusBadRequest)
+				writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+					"name required", nil)
 				return
 			}
 			if err := core.DisableTool(ctx, name); err != nil {
-				log.Printf("tools: disable %q: %v", name, err)
-				http.Error(w, "disable failed: "+err.Error(), http.StatusBadGateway)
+				writeProblem(w, r, http.StatusBadGateway, problemToolsChange,
+					"disable failed", fmt.Errorf("disable tool %q: %w", name, err))
 				return
 			}
 			msg = "disabled " + name
 		case "dismiss":
 			if name == "" {
-				http.Error(w, "name required", http.StatusBadRequest)
+				writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+					"name required", nil)
 				return
 			}
 			if err := core.DeleteTool(ctx, name); err != nil {
-				log.Printf("tools: dismiss %q: %v", name, err)
-				http.Error(w, "dismiss failed: "+err.Error(), http.StatusBadGateway)
+				writeProblem(w, r, http.StatusBadGateway, problemToolsChange,
+					"dismiss failed", fmt.Errorf("dismiss tool %q: %w", name, err))
 				return
 			}
 			msg = "dismissed " + name
 		default:
-			http.Error(w, "unknown action", http.StatusBadRequest)
+			writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+				"unknown action", nil)
 			return
 		}
 	}
 	proposed, err1 := core.ListTools(ctx, "proposed")
 	enabled, err2 := core.ListTools(ctx, "enabled")
 	if err := cmp.Or(err1, err2); err != nil {
-		log.Printf("tools: %v", err)
-		http.Error(w, "core read failed", http.StatusBadGateway)
+		writeProblem(w, r, http.StatusBadGateway, problemCoreReadFailed,
+			"core read failed", fmt.Errorf("list tools: %w", err))
 		return
 	}
 	// MCP is off by default and an older core may not know the method at all,
 	// so a failure here renders an empty section rather than breaking the page.
 	servers, err := core.MCPServers(ctx)
 	if err != nil {
-		log.Printf("tools: mcp servers: %v", err)
+		logProblem(r, http.StatusOK, problemCoreReadFailed,
+			"MCP server status unavailable", fmt.Errorf("read MCP server status: %w", err))
 		servers = nil
 	}
 	// Enabled rows are shown grouped by capability domain (Vikunja #452). A
diff --git a/cmd/mavweb/voiceproxy.go b/cmd/mavweb/voiceproxy.go
index 9cb8964..1fd2531 100644
--- a/cmd/mavweb/voiceproxy.go
+++ b/cmd/mavweb/voiceproxy.go
@@ -46,24 +46,28 @@ func pushToTalk(pcm []byte) voice.Request {
 
 func handlePTT(w http.ResponseWriter, r *http.Request, voiceAddr string, session *webauthn.PasskeySession, requireStepUp bool) {
 	if r.Method != http.MethodPost {
-		http.Error(w, "POST only", http.StatusMethodNotAllowed)
+		writeProblem(w, r, http.StatusMethodNotAllowed, problemMethodNotAllowed,
+			"POST only", nil)
 		return
 	}
-	if !stepUpGate(w, session, requireStepUp) {
+	if !stepUpGate(w, r, session, requireStepUp) {
 		return
 	}
 	body, err := io.ReadAll(http.MaxBytesReader(w, r.Body, maxPTTAudioBytes))
 	if err != nil {
 		var tooLarge *http.MaxBytesError
 		if errors.As(err, &tooLarge) {
-			http.Error(w, "audio exceeds the ten-minute PTT limit", http.StatusRequestEntityTooLarge)
+			writeProblem(w, r, http.StatusRequestEntityTooLarge, problemPayloadTooLarge,
+				"audio exceeds the ten-minute PTT limit", err)
 			return
 		}
-		http.Error(w, "read audio", http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"read audio", fmt.Errorf("read PTT audio: %w", err))
 		return
 	}
 	if len(body) < 4 {
-		http.Error(w, "too short", 400)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"audio too short", nil)
 		return
 	}
 
@@ -72,36 +76,38 @@ func handlePTT(w http.ResponseWriter, r *http.Request, voiceAddr string, session
 	var d net.Dialer
 	tc, err := d.DialContext(r.Context(), "tcp", voiceAddr)
 	if err != nil {
-		log.Printf("ptt dial voice: %v", err)
-		http.Error(w, "voice unavailable", http.StatusServiceUnavailable)
+		writeProblem(w, r, http.StatusServiceUnavailable, problemVoiceUnavailable,
+			"voice unavailable", fmt.Errorf("dial voice service: %w", err))
 		return
 	}
 	defer tc.Close()
 
 	req := pushToTalk(body)
 	if err := writeFrame(tc, &req); err != nil {
-		log.Printf("ptt write: %v", err)
-		http.Error(w, err.Error(), 500)
+		writeProblem(w, r, http.StatusBadGateway, problemVoiceTransport,
+			"voice request failed", fmt.Errorf("write voice request: %w", err))
 		return
 	}
 
 	for {
 		resp, push, err := readOneFrame(tc)
 		if err != nil {
-			log.Printf("ptt read: %v", err)
-			http.Error(w, err.Error(), 500)
+			writeProblem(w, r, http.StatusBadGateway, problemVoiceTransport,
+				"voice response failed", fmt.Errorf("read voice response: %w", err))
 			return
 		}
 		if push != nil {
 			continue
 		}
 		if resp.Error != nil {
-			http.Error(w, resp.Error.Message, 500)
+			writeProblem(w, r, http.StatusBadGateway, problemVoiceResponse,
+				"voice turn failed", fmt.Errorf("voice RPC error: %s", resp.Error.Message))
 			return
 		}
 		var pttResp voice.PushToTalkResp
 		if err := json.Unmarshal(resp.Result, &pttResp); err != nil {
-			http.Error(w, err.Error(), 500)
+			writeProblem(w, r, http.StatusBadGateway, problemVoiceResponse,
+				"voice response failed", fmt.Errorf("decode voice response: %w", err))
 			return
 		}
 		w.Header().Set("Content-Type", "audio/l16;rate=16000;channels=1")
diff --git a/cmd/mavweb/webauthn.go b/cmd/mavweb/webauthn.go
index f1ef4a7..1233144 100644
--- a/cmd/mavweb/webauthn.go
+++ b/cmd/mavweb/webauthn.go
@@ -92,8 +92,8 @@ var passkeyTmpl = parsePage("passkey", passkeyPageHTML, nil)
 func (h *PasskeyHandle) RegisterBegin(w http.ResponseWriter, r *http.Request) {
 	opts, challenge, err := h.rp.CreationOptions([]byte("maven-user"), "maven user")
 	if err != nil {
-		log.Printf("webauthn: register begin: %v", err)
-		http.Error(w, err.Error(), http.StatusInternalServerError)
+		writeProblem(w, r, http.StatusInternalServerError, problemWebAuthnBegin,
+			"passkey registration could not start", fmt.Errorf("webauthn register begin: %w", err))
 		return
 	}
 	w.Header().Set("Content-Type", "application/json")
@@ -102,7 +102,8 @@ func (h *PasskeyHandle) RegisterBegin(w http.ResponseWriter, r *http.Request) {
 
 func (h *PasskeyHandle) RegisterFinish(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {
-		http.Error(w, "POST only", http.StatusMethodNotAllowed)
+		writeProblem(w, r, http.StatusMethodNotAllowed, problemMethodNotAllowed,
+			"POST only", nil)
 		return
 	}
 	var body struct {
@@ -110,7 +111,8 @@ func (h *PasskeyHandle) RegisterFinish(w http.ResponseWriter, r *http.Request) {
 		Credential map[string]any `json:"credential"`
 	}
 	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
-		http.Error(w, "bad request: "+err.Error(), http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"invalid registration request", fmt.Errorf("decode webauthn registration: %w", err))
 		return
 	}
 	save := func(id string, publicKey []byte, _ []byte, _ string) error {
@@ -118,8 +120,8 @@ func (h *PasskeyHandle) RegisterFinish(w http.ResponseWriter, r *http.Request) {
 	}
 	credID, err := h.rp.FinishRegistration(save, body.Challenge, body.Credential)
 	if err != nil {
-		log.Printf("webauthn: register finish: %v", err)
-		http.Error(w, err.Error(), http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemWebAuthnFinish,
+			"passkey registration failed", fmt.Errorf("webauthn register finish: %w", err))
 		return
 	}
 	log.Printf("webauthn: registered credential %s", credID)
@@ -140,8 +142,8 @@ func (h *PasskeyHandle) RegisterFinish(w http.ResponseWriter, r *http.Request) {
 func (h *PasskeyHandle) AssertBegin(w http.ResponseWriter, r *http.Request) {
 	opts, challenge, err := h.rp.AssertionOptions()
 	if err != nil {
-		log.Printf("webauthn: assert begin: %v", err)
-		http.Error(w, err.Error(), http.StatusInternalServerError)
+		writeProblem(w, r, http.StatusInternalServerError, problemWebAuthnBegin,
+			"passkey assertion could not start", fmt.Errorf("webauthn assert begin: %w", err))
 		return
 	}
 	w.Header().Set("Content-Type", "application/json")
@@ -150,7 +152,8 @@ func (h *PasskeyHandle) AssertBegin(w http.ResponseWriter, r *http.Request) {
 
 func (h *PasskeyHandle) AssertFinish(w http.ResponseWriter, r *http.Request) {
 	if r.Method != http.MethodPost {
-		http.Error(w, "POST only", http.StatusMethodNotAllowed)
+		writeProblem(w, r, http.StatusMethodNotAllowed, problemMethodNotAllowed,
+			"POST only", nil)
 		return
 	}
 	var body struct {
@@ -176,7 +179,8 @@ func (h *PasskeyHandle) AssertFinish(w http.ResponseWriter, r *http.Request) {
 		Explicit bool `json:"explicit"`
 	}
 	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
-		http.Error(w, "bad request: "+err.Error(), http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemInvalidRequest,
+			"invalid assertion request", fmt.Errorf("decode webauthn assertion: %w", err))
 		return
 	}
 
@@ -189,8 +193,8 @@ func (h *PasskeyHandle) AssertFinish(w http.ResponseWriter, r *http.Request) {
 
 	credID, err := h.rp.FinishAssertion(lookup, update, body.Challenge, body.Credential)
 	if err != nil {
-		log.Printf("webauthn: assert finish: %v", err)
-		http.Error(w, err.Error(), http.StatusBadRequest)
+		writeProblem(w, r, http.StatusBadRequest, problemWebAuthnFinish,
+			"passkey assertion failed", fmt.Errorf("webauthn assert finish: %w", err))
 		return
 	}
 
@@ -201,8 +205,8 @@ func (h *PasskeyHandle) AssertFinish(w http.ResponseWriter, r *http.Request) {
 		ctx, cancel := context.WithTimeout(r.Context(), 5*time.Second)
 		defer cancel()
 		if err := h.assertFn.AssertStepUp(ctx); err != nil {
-			log.Printf("webauthn: assert step-up: %v", err)
-			http.Error(w, "step-up assertion failed", http.StatusBadGateway)
+			writeProblem(w, r, http.StatusBadGateway, problemWebAuthnStepUp,
+				"step-up assertion failed", fmt.Errorf("assert step-up in core: %w", err))
 			return
 		}
 	}
diff --git a/deploy/README.md b/deploy/README.md
index 1d3f9ac..0c64634 100644
--- a/deploy/README.md
+++ b/deploy/README.md
@@ -11,6 +11,11 @@ dir and read-only models.
 cp deploy/db_key.env.example deploy/db_key.env
 printf 'MAVEN_DB_KEY=%s\n' "$(openssl rand 32 | base64 -w0)" > deploy/db_key.env
 
+# 1b. review the complete secret inventory. Copy homesrv values to
+# deploy/telegram.env, ambient enable/token values to .env, and workpc values
+# to the destinations named in the example. Live blocks reject empty secrets.
+cp deploy/telegram.env.example deploy/telegram.env
+
 # 2. build + start
 docker compose build
 docker compose up -d
diff --git a/deploy/cw2/serve.py b/deploy/cw2/serve.py
index 89da08c..c13e54c 100644
--- a/deploy/cw2/serve.py
+++ b/deploy/cw2/serve.py
@@ -20,6 +20,7 @@ every stutter on the way there.
 """
 
 import hmac
+import ipaddress
 import json
 import logging
 import os
@@ -71,6 +72,18 @@ def authorised(headers):
     return hmac.compare_digest(got, "Bearer " + TOKEN)
 
 
+def validate_listener_auth(host, token):
+    """Refuse a network listener without its bearer boundary."""
+    try:
+        loopback = ipaddress.ip_address(host).is_loopback
+    except ValueError:
+        loopback = host.casefold() == "localhost"
+    if not loopback and not token.strip():
+        raise ValueError(
+            f"CW2_TOKEN is required while CW2_HOST={host!r} is reachable from the network"
+        )
+
+
 class Handler(BaseHTTPRequestHandler):
     protocol_version = "HTTP/1.1"
 
@@ -142,8 +155,10 @@ class Handler(BaseHTTPRequestHandler):
 
 
 def main():
-    if not TOKEN:
-        log.warning("no CW2_TOKEN set: anything on the LAN can post audio here")
+    try:
+        validate_listener_auth(HOST, TOKEN)
+    except ValueError as exc:
+        raise SystemExit(str(exc)) from exc
     # Bind before loading, so a restart answers 503 rather than refusing the
     # connection. Both make Maven fall back, but only one of them says why.
     srv = ThreadingHTTPServer((HOST, PORT), Handler)
diff --git a/deploy/cw2/test_serve.py b/deploy/cw2/test_serve.py
new file mode 100644
index 0000000..d6493e7
--- /dev/null
+++ b/deploy/cw2/test_serve.py
@@ -0,0 +1,24 @@
+import unittest
+
+import serve
+
+
+class ListenerAuthTest(unittest.TestCase):
+    def test_network_listener_requires_token(self):
+        for host in ("0.0.0.0", "192.168.1.105", "::"):
+            for token in ("", "   "):
+                with self.subTest(host=host, token=token):
+                    with self.assertRaises(ValueError):
+                        serve.validate_listener_auth(host, token)
+
+    def test_loopback_listener_may_be_explicitly_unauthenticated(self):
+        for host in ("127.0.0.1", "::1", "localhost"):
+            with self.subTest(host=host):
+                serve.validate_listener_auth(host, "")
+
+    def test_network_listener_accepts_token(self):
+        serve.validate_listener_auth("0.0.0.0", "secret")
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/deploy/mavend.json b/deploy/mavend.json
index 349d163..8262054 100644
--- a/deploy/mavend.json
+++ b/deploy/mavend.json
@@ -31,14 +31,14 @@
     "rule — three things in series that have each failed once, and when they do",
     "a sev4 nudge has nowhere to go. ntfy shares none of them: it is reached",
     "directly, no relay.",
-    "It is not only a spare. The routing table sends sev3-away and away",
-    "reminders here and NOWHERE else, so with this block absent those two",
-    "routes hit a nil sink and vanish without a log or an outbox row.",
+    "It is the preferred away reach. Reminders fall back to Telegram in order,",
+    "and every missing reach is recorded in the outbox rather than disappearing.",
     "The credential is an ntfy access token, scoped write-only to this one",
     "topic, so a popped sink can push to it and cannot read it back. Set it in",
     "deploy/telegram.env beside the telegram secrets; that file is gitignored."
   ],
   "ntfy": {
+    "disabled": true,
     "base_url": "https://ntfy.kvmx.ru",
     "topic": "maven",
     "token": "${NTFY_TOKEN}"
@@ -76,7 +76,9 @@
     "resident model without saying so. Deleting this block restores exactly",
     "the behaviour homesrv had before it existed.",
     "Addressed by LAN address, not container name: mavgpud runs on another",
-    "machine and there is no shared docker network to name it on."
+    "machine and there is no shared docker network to name it on.",
+    "model_disabled keeps only this model arm dark until MAVEN_GPU_TOKEN is",
+    "provisioned; the independently authenticated STT arm below stays live."
   ],
   "//workstation.stt": [
     "CrisperWhisper 2.0 turbo on the same machine, a second service on port",
@@ -93,6 +95,7 @@
     "The token is what stops anything on the LAN posting audio to that port."
   ],
   "workstation": {
+    "model_disabled": true,
     "url": "http://192.168.1.105:8080",
     "token": "${MAVEN_GPU_TOKEN}",
     "probe": "15s",
diff --git a/deploy/telegram.env.example b/deploy/telegram.env.example
index 3717da7..439584f 100644
--- a/deploy/telegram.env.example
+++ b/deploy/telegram.env.example
@@ -16,6 +16,34 @@ NTFY_TOKEN=
 # the card. Any long random string; mint one with:
 #   openssl rand -hex 32
 # The same value goes in a file on workpc, named by token_file in
-# deploy/mavgpud.json. Unset here and every workstation turn falls back to the
-# resident model, because mavgpud answers 401 and Maven reads that as down.
+# deploy/mavgpud.json. Empty is valid only while workstation.model_disabled is
+# true; enabling the LAN model arm without it fails Maven's config validation.
 MAVEN_GPU_TOKEN=
+
+# Bearer token used by Maven when it sends audio to the workstation's
+# CrisperWhisper service. The matching CW2_TOKEN is installed on workpc; these
+# two values must be identical. Leaving both unset is only safe while that
+# remote STT service is bound to loopback or its STT block is disabled.
+MAVEN_STT_TOKEN=
+
+# Home Assistant is currently explicitly disabled in deploy/mavend.json. Keep
+# this name in the canonical inventory so enabling that block cannot turn into
+# a valid-looking configuration with an expanded-empty token.
+HA_TOKEN=
+
+# docker compose reads these from the repository-root `.env`, before it starts
+# containers; they are listed here even though their destination differs so
+# this remains the complete deployment inventory. Copy both lines to `.env`.
+# Enabling with an empty token fails startup; false is the explicit dark state.
+# MAVEN_AMBIENT_ENABLED=false
+# MAVEN_AMBIENT_TOKEN=
+
+# Workstation-side counterpart to MAVEN_STT_TOKEN. Install this line in the
+# EnvironmentFile named by deploy/mavgpud.service (currently
+# %h/Programs/cw2-service/cw2.env), not in homesrv's telegram.env.
+# CW2_TOKEN=
+
+# The encrypted database key has its own narrowly mounted file,
+# deploy/db_key.env, and its own generator in deploy/README.md. It is named
+# here so an operator auditing this one inventory sees every deployed secret.
+# MAVEN_DB_KEY=
diff --git a/docker-compose.yml b/docker-compose.yml
index 9d3f9d6..0d499db 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -97,15 +97,17 @@ services:
     <<: *image
     # voice.bind is 0.0.0.0:9100 in deploy/mavend.json so mavweb can reach it
     # cross-container. Verified 2026-07-06.
-    # -ambient-token turns on POST /api/ambient (Vikunja #126): the phone posts
-    # notification text, mavweb keeps only a meeting time. Empty ⇒ no route at
-    # all, which is what a missing MAVEN_AMBIENT_TOKEN gives. The value comes
-    # from the gitignored .env docker compose reads for interpolation, NOT from
-    # an env_file — flags are interpolated before any service env exists.
+    # -ambient-enabled turns on POST /api/ambient (Vikunja #126): the phone posts
+    # notification text, mavweb keeps only a meeting time. The explicit enabled
+    # flag prevents an unset token from looking like an intentional dark state.
+    # Both values come from the gitignored .env docker compose reads for
+    # interpolation, NOT from an env_file — flags are interpolated before any
+    # service env exists.
     # Weakness worth naming: mavweb takes this as a flag, so it is visible in
     # `ps` inside this container, unlike the zenmoney and IMAP secrets which are
     # read from files.
     command: ["mavweb", "-addr", ":9201", "-voice", "mavend:9100", "-core", "/run/maven/mavend.sock",
+              "-ambient-enabled", "${MAVEN_AMBIENT_ENABLED:-false}",
               "-ambient-token", "${MAVEN_AMBIENT_TOKEN:-}",
               "-nexus", "http://nexus:9740", "-praxis", "http://praxis:8989", "-hexis", "http://hexis:9741"]
     depends_on: [mavend]
diff --git a/docs/caveats/CLAUDE.md b/docs/caveats/CLAUDE.md
index a024518..a56d9fd 100644
--- a/docs/caveats/CLAUDE.md
+++ b/docs/caveats/CLAUDE.md
@@ -22,27 +22,26 @@ caveat is the pointer between them plus the trigger.
 
 Every entry below came from the 2026-08-10 deep audit
 (`docs/evals/2026-08-10-repo-audit.md`), except the last, which came from wiring
-the gate the audit asked for. Nine of the twenty findings are fixed and have no
+the gate the audit asked for. Twelve of the twenty findings are fixed and have no
 entry. The unauthenticated mavgpud proxy was V-673. The 20 reachable advisories
 in the toolchain and `x/text` were V-682. The missing analyzers were V-694, and
 what they now report is the baseline entry under V-701. The invalid STT and
 weather responses were V-675/V-676, the stuck TCP close was V-679, and the
 unbounded PTT path was V-688. The two unguarded
 invariants were V-692 and V-693, and their guards are described in
-`docs/routing.md`.
+`docs/routing.md`. The complete secret inventory and fail-closed integration
+validation were V-691. The atomic reminder transition was V-678. The traceable,
+sanitized mavweb problem contract was V-689.
 
 | limit | severity |
 | --- | --- |
 | [Anyone past the proxy can enroll a passkey](security.md#enrollment) | high |
 | [Passkey credentials are rewritten in place](security.md#credentials) | medium |
 | [Dialogue persistence errors are swallowed](storage.md#dialogue) | medium |
-| [The reminder transition is a lost update](storage.md#reminders) | medium |
 | [A recall miss scans two whole tables](storage.md#recall) | medium |
-| [mavweb errors cannot be traced](transport.md#errors) | medium |
 | [Fact enrichment is a 20-call serial waterfall](workers.md#enrichment) | medium |
 | [A suppressed nudge is phrased anyway](workers.md#nudges) | medium |
 | [Committed absolute paths pin the build to this box](config.md#paths) | medium |
-| [The env example omits deployed variables](config.md#secrets) | medium |
 | [The analyzers pass against a baseline, not zero](dependencies.md#baseline) | medium |
 | [Domain packages depend on store and IPC types](layering.md#dtos) | low |
 | [Eleven symbols are unreachable](layering.md#deadcode) | low |
diff --git a/docs/caveats/config.md b/docs/caveats/config.md
index 41ccd5b..8fdd67e 100644
--- a/docs/caveats/config.md
+++ b/docs/caveats/config.md
@@ -8,14 +8,3 @@ workstation model and Python paths. Vendoring hides the `go.mod` problem for an
 ordinary build. `-mod=mod`, `go mod tidy` and a fresh checkout all fail.
 Revisit when: anyone clones this repo elsewhere, or a `tidy` is needed.
 Workaround: build only from this checkout, with the vendor directory.
-
-## The env example omits deployed variables [#691] {#secrets}
-
-Costs: a fresh deploy can lose remote speech-to-text or ambient authentication
-and run on fallback behaviour with an apparently valid config. Three variables
-are referenced and undocumented: `MAVEN_STT_TOKEN`, `MAVEN_AMBIENT_TOKEN` and
-`CW2_TOKEN`. V-673 added `MAVEN_GPU_TOKEN` to the example.
-It is not silent. The loader logs which variables were unset and says whatever
-they configure is off. What is missing is a startup failure.
-Revisit when: the box is redeployed from scratch, or a new secret is added.
-Workaround: read that log line at startup.
diff --git a/docs/caveats/storage.md b/docs/caveats/storage.md
index 3f139dc..eab4d06 100644
--- a/docs/caveats/storage.md
+++ b/docs/caveats/storage.md
@@ -11,14 +11,6 @@ Revisit when: a restart is reported as losing context. Sooner if a turn starts
 reading dialogue rows back to him.
 Workaround: none. The failure is invisible from outside.
 
-## The reminder transition is a lost update [#678] {#reminders}
-
-Costs: a concurrent fire and cancel both succeed and the last writer wins.
-Medium today because cancellation has no surface. High the moment V-622 adds
-one, and V-622 does not describe this invariant.
-Revisit when: V-622 starts, whichever comes first.
-Workaround: none, but the window is small while nothing can cancel.
-
 ## A recall miss scans two whole tables [#681] {#recall}
 
 Costs: every missed recall reads all of `memory_vectors` and then decodes and
diff --git a/docs/caveats/transport.md b/docs/caveats/transport.md
deleted file mode 100644
index 911cad3..0000000
--- a/docs/caveats/transport.md
+++ /dev/null
@@ -1,12 +0,0 @@
-# Transport
-
-The HTTP and socket seams. What a client can do to them, and what a shutdown
-can do to us.
-
-## mavweb errors cannot be traced [#689] {#errors}
-
-Costs: some handlers return the raw internal error, which discloses internals.
-Others return a generic one with no identifier, which cannot be joined to its
-log line. There is no request-id middleware to join them.
-Revisit when: a reported UI failure cannot be found in the log.
-Workaround: read the log by timestamp.
diff --git a/docs/deployment.md b/docs/deployment.md
index 3b0ed05..58a7ba3 100644
--- a/docs/deployment.md
+++ b/docs/deployment.md
@@ -78,7 +78,10 @@ vocabulary size. CW2's 51897 tokens shift seven special token ids. So CW2 is its
 own transformers service on port 8081 (`deploy/cw2/serve.py`).
 `stt.HTTPTranscriber` posts raw PCM to it with a bearer token, because audio is
 the most sensitive thing that crosses this seam. The switch is `workstation.stt`
-in `deploy/mavend.json`, and deleting the block sends every utterance to mavsttd.
+in `deploy/mavend.json`. A LAN URL with an empty token fails config validation;
+`workstation.stt.disabled: true` is the STT-only dark state;
+`workstation.disabled: true` disables both remote arms. The model has its own
+`model_disabled` switch because CW2 can remain live without the model proxy.
 
 **mavgpud runs that service as a second child.** This is not an optimisation.
 CW2 is a ROCm process on the same card, so it registers on the KFD like any
@@ -208,6 +211,18 @@ rule.
 
 ## Web UI conventions
 
+Every HTTP response carries a server-generated `X-Request-ID`. Error responses
+use `application/problem+json` with three fields: a sanitized `error`, a stable
+low-cardinality `code`, and that `request_id`. `writeProblem` is the only error
+writer: it records the full wrapped error beside the same ID in the mavweb log,
+while implementation paths, transport messages and credentials never reach the
+browser. A page that can usefully degrade instead of failing keeps HTTP 200 and
+renders the same code/request reference beside its sanitized panel error.
+
+The `/ecosystem` panel uses its HTTP request ID as `X-Correlation-ID` on its
+direct Nexus, Praxis and Hexis reads. Calls routed through mavend retain
+mavend's action-scoped correlation contract instead.
+
 Server-rendered pages share `cmd/mavweb/static/ui.css` (served at `/ui.css`) and
 the shell partial in `cmd/mavweb/shell.html`. A page opens with
 `{{template "shellTop" "<page-key>"}}` and closes with `{{template "shellBottom"}}`,
diff --git a/docs/offload.md b/docs/offload.md
index f51fc1c..ee5f19e 100644
--- a/docs/offload.md
+++ b/docs/offload.md
@@ -113,8 +113,11 @@ read `/slots`, which returns other callers' prompts. mavgpud now reads
 network without one. Downgrading to loopback instead would look safe and take
 the model arm down. Maven sends the same token from `workstation.token`, on the
 completion and on the `/health` probe alike. An unsigned probe answers 401,
-which Pair reads as a busy card, so a missing token degrades to the resident
-model rather than breaking a turn. The proxy also
+which Pair reads as a busy card, but Maven now rejects a live LAN workstation
+block with a missing token at startup: fallback must describe a temporarily
+unavailable machine, not hide a broken secret source. `model_disabled: true`
+is the explicit resident-only state and does not take CW2 down with it. The
+proxy also
 allowlists the five paths Maven calls, so a leaked token buys the model API and
 not llama-server's admin surface.
 
diff --git a/docs/operations.md b/docs/operations.md
index 7b9dd63..4440ba4 100644
--- a/docs/operations.md
+++ b/docs/operations.md
@@ -67,14 +67,30 @@ Config path: `~/.config/maven/mavend.json`. Full example with all options.
 
 Omit the `embedder` block entirely to use the deterministic HashEmbedder floor (no ML, no ONNX runtime dependency). Useful for testing or low-resource setups.
 
-`${NTFY_TOKEN}` and the `${TELEGRAM_*}` vars are expanded from `deploy/telegram.env`, which is gitignored. Copy `deploy/telegram.env.example` and fill it in. Mint a scoped token rather than reusing an admin one. It needs write access to the `maven` topic and nothing else:
+`deploy/telegram.env.example` is the canonical inventory for every deployed
+secret, including values whose destination is the root `.env`, the workpc CW2
+environment file, or `deploy/db_key.env`. Copy values only to the destination
+named beside them; never commit the populated files. Maven expands the homesrv
+sink, workstation, and Home Assistant variables from `deploy/telegram.env`.
+
+Every written integration block is either explicitly disabled or live. A live
+Telegram, ntfy, LAN workstation model/STT, Home Assistant, ambient, CW2, or
+encrypted-database configuration with an empty credential fails startup. This
+keeps a missing env file from quietly becoming fallback behavior. The deployed
+ntfy is currently `disabled: true`, and the workstation model arm is
+`model_disabled: true`; the separately credentialed CW2 STT arm remains live.
+Remove a dark-state flag only after provisioning that arm's credential.
+
+Mint a scoped ntfy token rather than reusing an admin one. It needs write access
+to the `maven` topic and nothing else:
 
 ```sh
 ntfy access maven maven write-only
 ntfy token add --expires=never maven
 ```
 
-Deleting the `ntfy` block turns the reach off, and that is not a no-op. The routing table sends sev3-away nudges and away reminders to ntfy and nowhere else. With no sink wired they hit a nil and vanish, leaving no log line and no `delivery_attempts` row (V-649).
+`disabled: true` keeps a documented ntfy block dark. When enabled, reminders
+try ntfy and fall through to Telegram; delivery attempts record each reach.
 
 ## mavsttd — STT worker (optional, remote whisper.cpp)
 
diff --git a/internal/config/config.go b/internal/config/config.go
index 3f5e928..41d9e8a 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -332,12 +332,11 @@ func Load(path string) (*Config, error) {
 	// file committed to git.
 	expanded, missing := expandEnv(string(b))
 	if len(missing) > 0 {
-		// An unset variable expands to "", which every block reads as "not
-		// configured" and none of them complains about. That is the intended
-		// behaviour and it stays: CI parses this same file with no secrets
-		// present. What was missing is the line telling the operator which
-		// capability he just turned off by forgetting an env file.
-		log.Printf("config: %s references unset environment variables %v — those settings are empty, so whatever they configure is off", path, missing)
+		// Expansion happens before typed validation. A disabled block may carry
+		// empty placeholders; an enabled block that needs one of these values is
+		// rejected below. Log the names too so a failed deploy says which secret
+		// source was absent without ever printing a value.
+		log.Printf("config: %s references unset environment variables %v — expanded them to empty; enabled integrations will reject missing credentials", path, missing)
 	}
 	var c Config
 	if err := json.Unmarshal([]byte(expanded), &c); err != nil {
@@ -459,6 +458,12 @@ func (c *Config) validate() error {
 	if err := c.validateTelegram(); err != nil {
 		return err
 	}
+	if err := c.validateNtfy(); err != nil {
+		return err
+	}
+	if err := c.validateWorkstation(); err != nil {
+		return err
+	}
 	return nil
 }
 
@@ -468,16 +473,23 @@ func (c *Config) validate() error {
 // answers nothing — the failure is invisible from the chat. Same shape as
 // validateNetScan: fail the config rather than the turn.
 func (c *Config) validateTelegram() error {
-	if c.Telegram == nil || !c.Telegram.Intake {
+	if c.Telegram == nil || c.Telegram.Disabled {
 		return nil
 	}
-	// An unset ${TELEGRAM_*} expands to empty, and the daemon already reads an
-	// empty token or chat id as telegram not being wired at all. Validating a
-	// block that wires nothing would fail a box that merely has no bot.
-	if c.Telegram.BotToken == "" || c.Telegram.ChatID == "" {
+	if err := telegramsink.Validate(*c.Telegram); err != nil {
+		return err
+	}
+	if c.Telegram.Intake {
+		return telegramsink.ValidateIntakeChatID(c.Telegram.ChatID)
+	}
+	return nil
+}
+
+func (c *Config) validateNtfy() error {
+	if c.Ntfy == nil {
 		return nil
 	}
-	return telegramsink.ValidateIntakeChatID(c.Telegram.ChatID)
+	return ntfysink.Validate(*c.Ntfy)
 }
 
 // DBEncryptionKey resolves the at-rest encryption key: DBKeyEnv (if set) wins
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index 75750e1..7008e47 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -435,10 +435,21 @@ func TestNormaliseDropsAddresslessWorkstation(t *testing.T) {
 	}
 }
 
+func TestModelDisabledKeepsLiveSTT(t *testing.T) {
+	p := writeConfig(t, `{"workstation":{"model_disabled":true,"stt":{"url":"http://192.168.1.105:8081/transcribe","token":"secret"}}}`)
+	c, err := Load(p)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if c.Workstation == nil || c.Workstation.Stt == nil || !c.Workstation.ModelDisabled {
+		t.Fatalf("model-only dark state did not preserve STT: %+v", c.Workstation)
+	}
+}
+
 // The health endpoint defaults to the supervisor's, not llama-server's: mavgpud
 // answers 503 while the card is held, and that refusal is the whole signal.
 func TestNormaliseFillsWorkstationDefaults(t *testing.T) {
-	c := &Config{Workstation: &WorkstationConfig{URL: "http://192.168.1.105:8080/"}}
+	c := &Config{Workstation: &WorkstationConfig{URL: "http://192.168.1.105:8080/", Token: "secret"}}
 	c.applyDefaults()
 	if c.Workstation == nil {
 		t.Fatal("dropped a usable workstation block")
@@ -460,6 +471,7 @@ func TestNormaliseKeepsExplicitWorkstationHealth(t *testing.T) {
 	c := &Config{Workstation: &WorkstationConfig{
 		URL:    "http://192.168.1.105:8080",
 		Health: "http://192.168.1.105:9000/ready",
+		Token:  "secret",
 	}}
 	c.applyDefaults()
 	if got, want := c.Workstation.Health, "http://192.168.1.105:9000/ready"; got != want {
@@ -467,6 +479,112 @@ func TestNormaliseKeepsExplicitWorkstationHealth(t *testing.T) {
 	}
 }
 
+func TestWorkstationLANEndpointsRequireSecrets(t *testing.T) {
+	for _, tc := range []struct {
+		name string
+		body string
+	}{
+		{"model", `{"workstation":{"url":"http://192.168.1.105:8080"}}`},
+		{"stt", `{"workstation":{"url":"http://127.0.0.1:8080","stt":{"url":"http://192.168.1.105:8081/transcribe"}}}`},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			if _, err := Load(writeConfig(t, tc.body)); err == nil {
+				t.Fatal("Load accepted an enabled LAN endpoint with no secret")
+			}
+		})
+	}
+}
+
+func TestWorkstationDisabledAllowsEmptySecrets(t *testing.T) {
+	p := writeConfig(t, `{"workstation":{"disabled":true,"url":"http://192.168.1.105:8080","stt":{"url":"http://192.168.1.105:8081/transcribe"}}}`)
+	c, err := Load(p)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if c.Workstation != nil {
+		t.Fatalf("disabled workstation survived normalisation: %+v", c.Workstation)
+	}
+}
+
+func TestWorkstationArmsMayBeDisabledIndependently(t *testing.T) {
+	modelOff := writeConfig(t, `{"workstation":{"model_disabled":true,"url":"http://192.168.1.105:8080","stt":{"url":"http://127.0.0.1:8081/transcribe"}}}`)
+	if _, err := Load(modelOff); err != nil {
+		t.Fatalf("Load model-disabled config: %v", err)
+	}
+
+	sttOff := writeConfig(t, `{"workstation":{"url":"http://127.0.0.1:8080","stt":{"disabled":true,"url":"http://192.168.1.105:8081/transcribe"}}}`)
+	c, err := Load(sttOff)
+	if err != nil {
+		t.Fatalf("Load STT-disabled config: %v", err)
+	}
+	if c.Workstation == nil || c.Workstation.Stt != nil {
+		t.Fatalf("STT-only dark state changed model arm: %+v", c.Workstation)
+	}
+}
+
+func TestWorkstationLoopbackMayRunWithoutSecret(t *testing.T) {
+	p := writeConfig(t, `{"workstation":{"url":"http://127.0.0.1:8080","stt":{"url":"http://localhost:8081/transcribe"}}}`)
+	if _, err := Load(p); err != nil {
+		t.Fatalf("Load loopback development endpoints: %v", err)
+	}
+}
+
+func TestTelegramLiveBlockRequiresBothSecrets(t *testing.T) {
+	for _, body := range []string{
+		`{"telegram":{"chat_id":"42"}}`,
+		`{"telegram":{"bot_token":"token"}}`,
+	} {
+		if _, err := Load(writeConfig(t, body)); err == nil {
+			t.Fatalf("Load accepted enabled Telegram block: %s", body)
+		}
+	}
+}
+
+func TestTelegramDisabledAllowsEmptySecrets(t *testing.T) {
+	if _, err := Load(writeConfig(t, `{"telegram":{"disabled":true}}`)); err != nil {
+		t.Fatalf("Load disabled Telegram: %v", err)
+	}
+}
+
+func TestNtfyLiveBlockRequiresSecret(t *testing.T) {
+	p := writeConfig(t, `{"ntfy":{"base_url":"https://ntfy.example","topic":"maven"}}`)
+	if _, err := Load(p); err == nil {
+		t.Fatal("Load accepted enabled ntfy block with no credential")
+	}
+}
+
+func TestNtfyDisabledAllowsEmptySecret(t *testing.T) {
+	p := writeConfig(t, `{"ntfy":{"disabled":true,"base_url":"https://ntfy.example","topic":"maven"}}`)
+	if _, err := Load(p); err != nil {
+		t.Fatalf("Load disabled ntfy: %v", err)
+	}
+}
+
+func TestSmartHomeLiveBlockRequiresSecret(t *testing.T) {
+	p := writeConfig(t, `{"smarthome":{"enabled":true,"provider":"homeassistant","url":"http://192.168.1.50:8123"}}`)
+	if _, err := Load(p); err == nil {
+		t.Fatal("Load accepted enabled Home Assistant block with no token")
+	}
+}
+
+func TestSmartHomeDisabledAllowsEmptySecret(t *testing.T) {
+	p := writeConfig(t, `{"smarthome":{"enabled":false,"provider":"homeassistant","url":"http://192.168.1.50:8123"}}`)
+	if _, err := Load(p); err != nil {
+		t.Fatalf("Load disabled Home Assistant: %v", err)
+	}
+}
+
+func TestConfiguredDBKeyEnvCannotBeEmpty(t *testing.T) {
+	t.Setenv("MAVEN_TEST_DB_KEY", "")
+	c := &Config{DBKeyEnv: "MAVEN_TEST_DB_KEY"}
+	if _, err := c.DBEncryptionKey(); err == nil {
+		t.Fatal("configured empty database key did not fail startup resolution")
+	}
+	if key, err := (&Config{}).DBEncryptionKey(); err != nil || key != nil {
+		t.Fatalf("explicit plaintext config = (%v, %v), want (nil, nil)", key, err)
+	}
+}
+
 func TestTelegramIntakeRefusesNamedChat(t *testing.T) {
 	// The push half accepts an @channelusername and the intake half cannot use
 	// one, so a box with both boots clean and answers nothing. Refuse the
diff --git a/internal/config/deployconfig_test.go b/internal/config/deployconfig_test.go
index e888ba7..090bf55 100644
--- a/internal/config/deployconfig_test.go
+++ b/internal/config/deployconfig_test.go
@@ -3,6 +3,7 @@ package config
 import (
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 )
 
@@ -14,14 +15,20 @@ import (
 // a config change and a code change have to agree here or the suite is red.
 //
 // The ${VAR} expansions come from a gitignored deploy/telegram.env that is not
-// present in CI. An unset var expands to the empty string, which is exactly the
-// "not configured" state every block already has to handle, so the parse is
-// still meaningful without the secrets.
+// present in CI. Live blocks reject empty secrets; this test supplies inert
+// Telegram values and verifies that every credential-less block is explicitly
+// disabled.
 func TestDeployConfigLoads(t *testing.T) {
 	path := filepath.Join("..", "..", "deploy", "mavend.json")
 	if _, err := os.Stat(path); err != nil {
 		t.Skipf("no deploy config at %s: %v", path, err)
 	}
+	// Live blocks fail on expanded-empty credentials. CI provides inert values
+	// so this test exercises the committed shape; explicitly disabled blocks
+	// (ntfy, workstation and Home Assistant) require none.
+	t.Setenv("TELEGRAM_BOT_TOKEN", "test-token")
+	t.Setenv("TELEGRAM_CHAT_ID", "-1001234567890")
+	t.Setenv("MAVEN_STT_TOKEN", "test-token")
 	cfg, err := Load(path)
 	if err != nil {
 		t.Fatalf("Load(%s): %v", path, err)
@@ -46,11 +53,10 @@ func TestDeployConfigLoads(t *testing.T) {
 		t.Error("router threshold did not get its default")
 	}
 
-	// The second reach (V-649). Deleting this block is how you turn ntfy off,
-	// so its absence has to be loud: sev3-away nudges and away reminders route
-	// to ntfy and to nothing else, and a nil sink drops them with no log and no
-	// outbox row. The token is a ${VAR} that CI cannot resolve, so this checks
-	// the wiring and not the credential.
+	// The second reach (V-649). The token is a ${VAR} that CI cannot resolve, so
+	// the committed deployment makes the dark state explicit. Removing disabled
+	// without provisioning a credential makes runtime wiring fail startup; it
+	// can never silently publish anonymously.
 	if cfg.Ntfy == nil {
 		t.Fatal("deploy config has no ntfy block — sev3-away and away reminders " +
 			"would have nowhere to land, and would vanish silently rather than fail")
@@ -58,4 +64,47 @@ func TestDeployConfigLoads(t *testing.T) {
 	if cfg.Ntfy.BaseURL == "" || cfg.Ntfy.Topic == "" {
 		t.Errorf("ntfy block is incomplete: base_url=%q topic=%q", cfg.Ntfy.BaseURL, cfg.Ntfy.Topic)
 	}
+	if !cfg.Ntfy.Disabled {
+		t.Fatal("deploy ntfy reach has no checked-in credential and must remain explicitly disabled")
+	}
+	if cfg.Workstation == nil || !cfg.Workstation.ModelDisabled || cfg.Workstation.Stt == nil {
+		t.Fatalf("deploy must disable only its uncredentialed model arm and retain authenticated STT: %+v", cfg.Workstation)
+	}
+}
+
+func TestCanonicalDeployEnvExampleNamesEverySecret(t *testing.T) {
+	path := filepath.Join("..", "..", "deploy", "telegram.env.example")
+	b, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("read %s: %v", path, err)
+	}
+	example := string(b)
+	references := map[string]bool{
+		// These two live outside ${...}: DBKeyEnv names an environment variable
+		// as JSON data, while the separately deployed Python child reads its own
+		// environment directly.
+		"CW2_TOKEN":    true,
+		"MAVEN_DB_KEY": true,
+	}
+	for _, source := range []string{
+		filepath.Join("..", "..", "deploy", "mavend.json"),
+		filepath.Join("..", "..", "docker-compose.yml"),
+	} {
+		raw, err := os.ReadFile(source)
+		if err != nil {
+			t.Fatalf("read deploy source %s: %v", source, err)
+		}
+		_ = os.Expand(string(raw), func(expr string) string {
+			// Compose supports ${NAME:-default}; os.Expand deliberately hands the
+			// full braced expression to this callback.
+			name, _, _ := strings.Cut(expr, ":-")
+			references[name] = true
+			return ""
+		})
+	}
+	for name := range references {
+		if !strings.Contains(example, name+"=") {
+			t.Errorf("canonical deploy env example omits %s", name)
+		}
+	}
 }
diff --git a/internal/config/workstation.go b/internal/config/workstation.go
index 6b34d2a..c6f153f 100644
--- a/internal/config/workstation.go
+++ b/internal/config/workstation.go
@@ -1,6 +1,8 @@
 package config
 
 import (
+	"fmt"
+	"net"
 	"net/url"
 	"strings"
 	"time"
@@ -18,6 +20,13 @@ import (
 // Only the prompt crosses the LAN, and the workstation is not "the box". The
 // rules in CLAUDE.md about what may leave still apply.
 type WorkstationConfig struct {
+	// Disabled keeps both written workpc arms explicitly dark. ModelDisabled is
+	// the narrower switch: CW2 STT may remain live while the large-model
+	// supervisor has no provisioned client token.
+	Disabled bool `json:"disabled,omitempty"`
+
+	ModelDisabled bool `json:"model_disabled,omitempty"`
+
 	// URL — where mavgpud listens, e.g. "http://192.168.1.105:8080". Empty ⇒
 	// the whole block is normalised to nil and nothing probes anything.
 	URL string `json:"url,omitempty"`
@@ -30,8 +39,8 @@ type WorkstationConfig struct {
 	// Token — the bearer credential mavgpud requires, expanded from the
 	// environment like every other secret here. It is what stops anything on
 	// the LAN spending the card, so a URL that is not loopback needs one.
-	// Wrong or missing reads as a workstation that is down, and Maven falls
-	// back to the resident model.
+	// A missing token on a LAN URL fails config validation. Loopback development
+	// endpoints may omit it.
 	Token string `json:"token,omitempty"`
 
 	// Probe — how often admission is re-checked. 0 ⇒ DefaultWorkstationProbe.
@@ -60,6 +69,10 @@ type WorkstationConfig struct {
 // the ggml-small.bin homesrv loads
 // (docs/evals/2026-08-09-crisperwhisper2-russian-wer.md).
 type WorkstationSttConfig struct {
+	// Disabled keeps the written CW2 endpoint dark without also disabling the
+	// independently authenticated model supervisor.
+	Disabled bool `json:"disabled,omitempty"`
+
 	// URL — the transcribe endpoint, e.g.
 	// "http://192.168.1.105:8081/transcribe". Empty ⇒ the block is normalised
 	// to nil and mavsttd takes every turn.
@@ -97,29 +110,85 @@ const (
 // model: an unconfigured workstation is the default deploy and must be
 // indistinguishable from today.
 func (c *Config) normaliseWorkstation() {
-	if c.Workstation != nil && strings.TrimSpace(c.Workstation.URL) == "" {
+	if c.Workstation != nil && c.Workstation.Disabled {
 		c.Workstation = nil
 	}
 	if c.Workstation == nil {
 		return
 	}
 	w := c.Workstation
-	if strings.TrimSpace(w.Health) == "" {
-		w.Health = strings.TrimRight(w.URL, "/") + "/health"
+	// Preserve the historical empty-block meaning. A live STT sub-block makes
+	// the parent non-empty; in that case omitting the model URL is an error
+	// unless model_disabled states the operator's intent.
+	if !w.ModelDisabled && strings.TrimSpace(w.URL) == "" &&
+		(w.Stt == nil || w.Stt.Disabled || strings.TrimSpace(w.Stt.URL) == "") {
+		c.Workstation = nil
+		return
 	}
-	if w.Probe <= 0 {
-		w.Probe = Duration(DefaultWorkstationProbe)
-	}
-	if w.Timeout <= 0 {
-		w.Timeout = Duration(DefaultWorkstationTimeout)
+	if !w.ModelDisabled {
+		if strings.TrimSpace(w.Health) == "" {
+			w.Health = strings.TrimRight(w.URL, "/") + "/health"
+		}
+		if w.Probe <= 0 {
+			w.Probe = Duration(DefaultWorkstationProbe)
+		}
+		if w.Timeout <= 0 {
+			w.Timeout = Duration(DefaultWorkstationTimeout)
+		}
 	}
 	normaliseWorkstationStt(w)
+	if w.ModelDisabled && w.Stt == nil {
+		c.Workstation = nil
+	}
+}
+
+// validateWorkstation rejects a live LAN endpoint without its bearer secret.
+// Loopback remains useful for local development without manufacturing a secret;
+// malformed or non-HTTP endpoints are rejected before any probe starts.
+func (c *Config) validateWorkstation() error {
+	if c.Workstation == nil {
+		return nil
+	}
+	w := c.Workstation
+	if !w.ModelDisabled {
+		if err := validateWorkstationEndpoint("workstation.url", w.URL, w.Token); err != nil {
+			return err
+		}
+		if err := validateWorkstationEndpoint("workstation.health", w.Health, w.Token); err != nil {
+			return err
+		}
+	}
+	if w.Stt != nil {
+		if err := validateWorkstationEndpoint("workstation.stt.url", w.Stt.URL, w.Stt.Token); err != nil {
+			return err
+		}
+		if err := validateWorkstationEndpoint("workstation.stt.health", w.Stt.Health, w.Stt.Token); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func validateWorkstationEndpoint(name, raw, token string) error {
+	u, err := url.Parse(raw)
+	if err != nil || u.Host == "" || (u.Scheme != "http" && u.Scheme != "https") {
+		return fmt.Errorf("%s must be an absolute http(s) URL", name)
+	}
+	host := strings.TrimSpace(u.Hostname())
+	loopback := strings.EqualFold(host, "localhost")
+	if ip := net.ParseIP(host); ip != nil {
+		loopback = ip.IsLoopback()
+	}
+	if !loopback && strings.TrimSpace(token) == "" {
+		return fmt.Errorf("%s is not loopback, so its token is required while enabled", name)
+	}
+	return nil
 }
 
 // normaliseWorkstationStt applies the speech-to-text block's defaults. No
 // address, no remote: mavsttd then takes every utterance, which is today.
 func normaliseWorkstationStt(w *WorkstationConfig) {
-	if w.Stt != nil && strings.TrimSpace(w.Stt.URL) == "" {
+	if w.Stt != nil && (w.Stt.Disabled || strings.TrimSpace(w.Stt.URL) == "") {
 		w.Stt = nil
 	}
 	if w.Stt == nil {
diff --git a/internal/delivery/channel.go b/internal/delivery/channel.go
index 8da5d20..ce7e891 100644
--- a/internal/delivery/channel.go
+++ b/internal/delivery/channel.go
@@ -20,7 +20,8 @@
 //
 //   - reminders are a SEPARATE class — two delivery paths. reminders bypass
 //     the restraint gate ("wake me 7" fires in quiet hours; that's the point).
-//     snooze still applies. voice when present, ntfy when away. fire once.
+//     snooze still applies. voice when present; when away, try ntfy then
+//     telegram as alternatives and stop after the first success. fire once.
 //
 // Architecture mirrors the loop's gather/pure split: the routing table is a
 // PURE function of (severity, presence); the Dispatcher holds the impure Sinks
@@ -43,6 +44,12 @@ import (
 // to import the voice package.
 var ErrVoiceNoSession = errors.New("delivery: voice: no live session")
 
+// ErrPermanent is the class of transport failures that waiting cannot repair:
+// a revoked credential or an endpoint that refuses this sender. Dispatchers
+// may still try a different reach for the same message, but the failed reach
+// must not be put on an automatic retry clock until its configuration changes.
+var ErrPermanent = errors.New("delivery: permanent failure")
+
 // Channel — one delivery transport. Drop is an explicit no-op (the routing
 // table chose to suppress, which is a decision, not a failure — "a missed
 // water nudge is noise"). a nil Sink for a wired channel is a daemon config
@@ -91,8 +98,11 @@ func ChannelsFor(sev loop.Severity, presence store.Bucket) []Channel {
 
 // ChannelsForReminder — reminders are a SEPARATE class that bypasses the gate.
 // "wake me 7" fires in quiet hours; that's the point. presence still routes
-// reachability: voice when present, ntfy when away. fires once — no repeat
-// (repeat-til-ack is a sev4 ops-hard behavior, not a reminder behavior).
+// reachability: voice when present, then an ordered ntfy→telegram alternative
+// chain when away. The dispatcher stops after the first successful alternative,
+// so a reminder still fires once rather than being broadcast on both channels.
+// There is no repeat (repeat-til-ack is a sev4 ops-hard behavior, not a reminder
+// behavior).
 //
 // reminders don't carry a Severity — they're user-stated future intent, not
 // loop-derived insistence. the routing is presence-only: reachability without
@@ -100,7 +110,7 @@ func ChannelsFor(sev loop.Severity, presence store.Bucket) []Channel {
 // per-reminder override, not a table entry.
 func ChannelsForReminder(presence store.Bucket) []Channel {
 	if presence == store.Away {
-		return []Channel{ChannelNtfy}
+		return []Channel{ChannelNtfy, ChannelTelegram}
 	}
 	return []Channel{ChannelVoice}
 }
diff --git a/internal/delivery/dispatcher.go b/internal/delivery/dispatcher.go
index 085e362..832903d 100644
--- a/internal/delivery/dispatcher.go
+++ b/internal/delivery/dispatcher.go
@@ -22,13 +22,25 @@ type NudgeRecorder interface {
 	RecordNudge(ctx context.Context, rule, channel, message string, ts time.Time) (int64, error)
 }
 
-// ReminderCompleter — the seam the store implements. For one-shot reminders:
-// pending → fired after successful delivery. For recurring reminders (with
-// cron): reschedule after successful delivery. A failed send does NOT mark or
-// reschedule it (it stays pending; the next tick re-delivers).
+// ReminderCompleter — the seam the store implements. Every original represented
+// by one external delivery is completed in one transaction. That matters for a
+// collapsed catch-up bundle: partially firing the originals would make the
+// next tick repeat a presentation that the user already received.
 type ReminderCompleter interface {
-	MarkReminder(ctx context.Context, id int64, status string) error
-	RescheduleReminder(ctx context.Context, id int64, now time.Time) error
+	CompleteReminderDelivery(ctx context.Context, originals []store.Reminder, now time.Time) error
+}
+
+// DurableReminderCompleter closes the successful outbox attempt and advances
+// every reminder occurrence in one local transaction. The external send and
+// local commit cannot be one transaction, but the local half must be: a crash
+// between `attempt=sent` and `reminder=fired` otherwise strands the reminder in
+// a permanently suppressed state.
+type DurableReminderCompleter interface {
+	CompleteSuccessfulReminderAttempt(ctx context.Context, attemptID int64, originals []store.Reminder, now time.Time) error
+}
+
+type ReminderBlocker interface {
+	BlockReminderDelivery(ctx context.Context, originals []store.Reminder, now time.Time, reason string) error
 }
 
 // Outbox — the durable delivery ledger. Begin is recorded BEFORE the external
@@ -39,7 +51,7 @@ type ReminderCompleter interface {
 // disabled (existing send/record behavior, unchanged — test scenarios that
 // don't care about crash recovery).
 type Outbox interface {
-	BeginDeliveryAttempt(ctx context.Context, kind, rule string, reminderID int64, channel, bodyHash string, now time.Time) (int64, error)
+	BeginDeliveryAttempt(ctx context.Context, kind, rule string, reminderID int64, deliveryGroup, channel, bodyHash string, now time.Time) (int64, error)
 	CompleteDeliveryAttempt(ctx context.Context, id int64, status string, now time.Time) error
 }
 
@@ -57,11 +69,11 @@ func bodyHash(channel Channel, body string) string {
 // on one attempt shouldn't block a nudge/reminder actually reaching the user
 // — but it does mean this attempt can't be reconciled after a crash, so it's
 // logged. Returns 0 (no-op id) when unrecorded.
-func (d *Dispatcher) beginOutbox(ctx context.Context, kind, rule string, reminderID int64, channel Channel, body string, now time.Time) int64 {
+func (d *Dispatcher) beginOutbox(ctx context.Context, kind, rule string, reminderID int64, deliveryGroup string, channel Channel, body string, now time.Time) int64 {
 	if d.cfg.Outbox == nil {
 		return 0
 	}
-	id, err := d.cfg.Outbox.BeginDeliveryAttempt(ctx, kind, rule, reminderID, string(channel), bodyHash(channel, body), now)
+	id, err := d.cfg.Outbox.BeginDeliveryAttempt(ctx, kind, rule, reminderID, deliveryGroup, string(channel), bodyHash(channel, body), now)
 	if err != nil {
 		log.Printf("dispatcher: outbox begin failed (send proceeds untracked): %v", err)
 		return 0
@@ -69,16 +81,37 @@ func (d *Dispatcher) beginOutbox(ctx context.Context, kind, rule string, reminde
 	return id
 }
 
+// beginReminderOutbox is stricter than the nudge helper above. A reminder may
+// be retried indefinitely, so sending it without the durable attempt row would
+// reopen an unobservable duplicate window after a crash. A configured but
+// unhealthy outbox therefore blocks this transport attempt; a deliberately nil
+// outbox still supports small isolated test/development wiring.
+func (d *Dispatcher) beginReminderOutbox(ctx context.Context, reminderID int64, deliveryGroup string, channel Channel, body string, now time.Time) (int64, error) {
+	if d.cfg.Outbox == nil {
+		return 0, nil
+	}
+	id, err := d.cfg.Outbox.BeginDeliveryAttempt(
+		ctx, "reminder", "", reminderID, deliveryGroup,
+		string(channel), bodyHash(channel, body), now,
+	)
+	if err != nil {
+		return 0, fmt.Errorf("begin reminder delivery attempt: %w", err)
+	}
+	return id, nil
+}
+
 // completeOutbox records the sink's outcome for a prior beginOutbox call.
 // id==0 means either tracking is disabled or the begin failed — nothing to
 // complete either way.
-func (d *Dispatcher) completeOutbox(ctx context.Context, id int64, status string, now time.Time) {
+func (d *Dispatcher) completeOutbox(ctx context.Context, id int64, status string, now time.Time) error {
 	if id == 0 || d.cfg.Outbox == nil {
-		return
+		return nil
 	}
 	if err := d.cfg.Outbox.CompleteDeliveryAttempt(ctx, id, status, now); err != nil {
 		log.Printf("dispatcher: outbox complete failed: %v", err)
+		return err
 	}
+	return nil
 }
 
 // PhrasedNudge — the phraser module's output for a nudge. the phraser (the
@@ -155,7 +188,7 @@ func (d *Dispatcher) DispatchNudge(ctx context.Context, pn PhrasedNudge, now tim
 			// the same afterwards. no nudges row: that table feeds the
 			// ignored_rate signal, and a nudge nobody could see must not
 			// count as ignored.
-			id := d.beginOutbox(ctx, "nudge", c.Rule.Name, 0, ch, pn.Summary, now)
+			id := d.beginOutbox(ctx, "nudge", c.Rule.Name, 0, "", ch, pn.Summary, now)
 			d.completeOutbox(ctx, id, store.DeliveryDropped, now)
 			log.Printf("dispatcher: dropped %s (sev%d, presence=%s) — routing table suppressed it",
 				c.Rule.Name, c.Severity, c.State.Presence)
@@ -176,7 +209,7 @@ func (d *Dispatcher) DispatchNudge(ctx context.Context, pn PhrasedNudge, now tim
 		if sink == nil {
 			continue
 		}
-		attemptID := d.beginOutbox(ctx, "nudge", c.Rule.Name, 0, ch, messageForChannel(s), now)
+		attemptID := d.beginOutbox(ctx, "nudge", c.Rule.Name, 0, "", ch, messageForChannel(s), now)
 		if err := safeSend(ctx, sink, s); err != nil {
 			if errors.Is(err, ErrSinkPanicked) {
 				// one broken sink must not eat the other channels for this
@@ -226,14 +259,17 @@ func (d *Dispatcher) DispatchNudge(ctx context.Context, pn PhrasedNudge, now tim
 }
 
 // DispatchReminder — routes a phrased reminder. reminders bypass the gate and
-// fire once (pending → fired after successful delivery). voice when present,
-// ntfy when away. no repeat (reminders fire once). marks the reminder fired
-// only if at least one channel succeeded — a failed send leaves it pending
-// for the next tick to re-deliver.
+// fire once (pending → fired after successful delivery). Voice is preferred
+// when present; if it has no live session, delivery falls back to the ordered
+// away alternatives. Away delivery tries ntfy, then telegram, and stops after
+// the first success. A failed or unwired alternative falls through to the next
+// one. If every selected alternative fails, the reminder stays pending and an
+// error is returned for the tick's retry path.
 func (d *Dispatcher) DispatchReminder(ctx context.Context, pr PhrasedReminder, now time.Time) ([]Dispatch, error) {
 	rd := pr.Decision
 	channels := ChannelsForReminder(rd.State.Presence)
-	var out []Dispatch
+	var failures []error
+	allPermanent := true
 	for i := 0; i < len(channels); i++ {
 		ch := channels[i]
 		s := Sendable{
@@ -245,62 +281,103 @@ func (d *Dispatcher) DispatchReminder(ctx context.Context, pr PhrasedReminder, n
 			Ts:         now,
 		}
 		s = minimalForAway(s)
-		sink := d.sinkFor(ch)
-		if sink == nil {
+		reminderID, deliveryGroup := reminderDeliveryIdentity(rd.Reminder)
+		attemptID, err := d.beginReminderOutbox(ctx, reminderID, deliveryGroup, ch, messageForChannel(s), now)
+		if err != nil {
+			allPermanent = false
+			failures = append(failures, err)
+			log.Printf("dispatcher: reminder %d delivery via %s withheld: %v", rd.Reminder.ID, ch, err)
+			continue
+		}
+		sink := d.sinkFor(ch)
+		if sink == nil {
+			d.completeOutbox(ctx, attemptID, store.DeliveryFailed, now)
+			err := fmt.Errorf("%s sink is not configured", ch)
+			failures = append(failures, err)
+			log.Printf("dispatcher: reminder %d delivery via %s failed: %v", rd.Reminder.ID, ch, err)
+			if ch == ChannelVoice {
+				channels = ChannelsForReminder(store.Away)
+				failures = nil
+				allPermanent = true
+				i = -1
+			}
 			continue
 		}
-		attemptID := d.beginOutbox(ctx, "reminder", "", rd.Reminder.ID, ch, messageForChannel(s), now)
 		if err := safeSend(ctx, sink, s); err != nil {
-			if errors.Is(err, ErrSinkPanicked) {
-				d.completeOutbox(ctx, attemptID, store.DeliveryFailed, now)
-				continue
+			d.completeOutbox(ctx, attemptID, store.DeliveryFailed, now)
+			failures = append(failures, fmt.Errorf("send %s: %w", ch, err))
+			if !errors.Is(err, ErrPermanent) {
+				allPermanent = false
 			}
 			if errors.Is(err, ErrVoiceNoSession) {
-				// presence guess was wrong — reroute reminder to the away
-				// channel (ntfy). voice is the only present channel, so nothing
-				// has been sent yet.
-				d.completeOutbox(ctx, attemptID, store.DeliveryFailed, now)
+				// Presence was stale. Voice is the only present alternative, so
+				// nothing has been sent and it is safe to start the away chain.
 				log.Printf("dispatcher: no live voice session for reminder %d, rerouting to away channels", rd.Reminder.ID)
 				channels = ChannelsForReminder(store.Away)
+				failures = nil
+				allPermanent = true
 				i = -1
 				continue
 			}
-			d.completeOutbox(ctx, attemptID, store.DeliveryFailed, now)
-			return out, fmt.Errorf("send %s: %w", ch, err)
+			log.Printf("dispatcher: reminder %d delivery via %s failed: %v", rd.Reminder.ID, ch, err)
+			continue
 		}
-		d.completeOutbox(ctx, attemptID, store.DeliverySent, now)
-		out = append(out, Dispatch{Sendable: s})
-	}
-	if d.cfg.Reminders != nil && len(out) > 0 {
-		// ID=0 is a synthetic digest reminder; it's not in the DB. Complete
-		// the collapsed originals it stands in for instead — only now, after
-		// a successful send, so a failed digest leaves them all pending.
+		out := []Dispatch{{Sendable: s}}
+		originals := []store.Reminder{rd.Reminder}
 		if rd.Reminder.ID == 0 {
-			for _, orig := range rd.Reminder.Collapsed {
-				if err := d.completeReminder(ctx, orig, now); err != nil {
-					return out, err
-				}
+			originals = rd.Reminder.Collapsed
+		}
+		if durable, ok := d.cfg.Reminders.(DurableReminderCompleter); ok && attemptID != 0 {
+			if err := durable.CompleteSuccessfulReminderAttempt(ctx, attemptID, originals, now); err != nil {
+				return out, fmt.Errorf("commit successful reminder delivery: %w", err)
+			}
+			return out, nil
+		}
+		if err := d.completeOutbox(ctx, attemptID, store.DeliverySent, now); err != nil {
+			// The external sink accepted the reminder, but its durable outcome is
+			// ambiguous. Do not complete the reminder row: startup reconciliation
+			// will mark the attempt unknown and DueReminders will hold the exact
+			// occurrence for operator resolution rather than sending a duplicate.
+			return out, fmt.Errorf("record successful reminder delivery: %w", err)
+		}
+		if d.cfg.Reminders != nil {
+			if err := d.cfg.Reminders.CompleteReminderDelivery(ctx, originals, now); err != nil {
+				return out, fmt.Errorf("complete reminder delivery: %w", err)
+			}
+		}
+		return out, nil
+	}
+	if len(failures) == 0 {
+		failures = append(failures, errors.New("no delivery alternatives selected"))
+		allPermanent = false
+	}
+	joined := errors.Join(failures...)
+	if allPermanent && d.cfg.Reminders != nil {
+		originals := []store.Reminder{rd.Reminder}
+		if rd.Reminder.ID == 0 {
+			originals = rd.Reminder.Collapsed
+		}
+		if blocker, ok := d.cfg.Reminders.(ReminderBlocker); ok {
+			if err := blocker.BlockReminderDelivery(ctx, originals, now, joined.Error()); err != nil {
+				return nil, fmt.Errorf("block permanently undeliverable reminder %d: %w", rd.Reminder.ID, err)
 			}
-		} else if err := d.completeReminder(ctx, rd.Reminder, now); err != nil {
-			return out, err
 		}
 	}
-	return out, nil
+	return nil, fmt.Errorf("deliver reminder %d: %w", rd.Reminder.ID, joined)
 }
 
-// completeReminder — post-delivery bookkeeping for one reminder: recurring
-// (cron set) reschedules, one-shot marks fired.
-func (d *Dispatcher) completeReminder(ctx context.Context, r store.Reminder, now time.Time) error {
-	if r.Cron != "" {
-		if err := d.cfg.Reminders.RescheduleReminder(ctx, r.ID, now); err != nil {
-			return fmt.Errorf("reschedule reminder %d: %w", r.ID, err)
-		}
-		return nil
+// reminderDeliveryIdentity gives the outbox both a human-readable real row id
+// and the exact occurrence key used for crash suppression. A collapsed digest
+// has synthetic ID zero, so its first original is the representative; the
+// shared delivery group still identifies every original atomically.
+func reminderDeliveryIdentity(r store.Reminder) (int64, string) {
+	if r.ID != 0 {
+		return r.ID, r.DeliveryGroup
 	}
-	if err := d.cfg.Reminders.MarkReminder(ctx, r.ID, "fired"); err != nil {
-		return fmt.Errorf("mark reminder %d fired: %w", r.ID, err)
+	if len(r.Collapsed) == 0 {
+		return 0, ""
 	}
-	return nil
+	return r.Collapsed[0].ID, r.Collapsed[0].DeliveryGroup
 }
 
 // RepeatUnacked — the daemon calls this each tick to re-send un-acked sev4
@@ -340,7 +417,7 @@ func (d *Dispatcher) RepeatUnacked(ctx context.Context, keys []string, now time.
 			Ts:             now,
 		}
 		s = minimalForAway(s)
-		attemptID := d.beginOutbox(ctx, "nudge", key, 0, ChannelTelegram, messageForChannel(s), now)
+		attemptID := d.beginOutbox(ctx, "nudge", key, 0, "", ChannelTelegram, messageForChannel(s), now)
 		if err := safeSend(ctx, d.cfg.Telegram, s); err != nil {
 			d.completeOutbox(ctx, attemptID, store.DeliveryFailed, now)
 			if errors.Is(err, ErrSinkPanicked) {
diff --git a/internal/delivery/dispatcher_test.go b/internal/delivery/dispatcher_test.go
index bf1f776..83b7bf9 100644
--- a/internal/delivery/dispatcher_test.go
+++ b/internal/delivery/dispatcher_test.go
@@ -3,6 +3,7 @@ package delivery
 import (
 	"context"
 	"errors"
+	"fmt"
 	"testing"
 	"time"
 
@@ -61,9 +62,22 @@ type fakeReminderCompleter struct {
 		status string
 	}
 	rescheduled []int64
+	blocked     []int64
+	blockReason string
 	err         error
 }
 
+func (f *fakeReminderCompleter) BlockReminderDelivery(_ context.Context, originals []store.Reminder, _ time.Time, reason string) error {
+	if f.err != nil {
+		return f.err
+	}
+	for _, r := range originals {
+		f.blocked = append(f.blocked, r.ID)
+	}
+	f.blockReason = reason
+	return nil
+}
+
 func (f *fakeReminderCompleter) MarkReminder(_ context.Context, id int64, status string) error {
 	if f.err != nil {
 		return f.err
@@ -83,6 +97,23 @@ func (f *fakeReminderCompleter) RescheduleReminder(_ context.Context, id int64,
 	return nil
 }
 
+func (f *fakeReminderCompleter) CompleteReminderDelivery(_ context.Context, originals []store.Reminder, _ time.Time) error {
+	if f.err != nil {
+		return f.err
+	}
+	for _, r := range originals {
+		if r.Cron != "" {
+			f.rescheduled = append(f.rescheduled, r.ID)
+			continue
+		}
+		f.marked = append(f.marked, struct {
+			id     int64
+			status string
+		}{r.ID, store.ReminderFired})
+	}
+	return nil
+}
+
 type fakeAck struct {
 	acked    map[string]bool
 	lastSent map[string]time.Time
@@ -152,10 +183,10 @@ func TestChannelsForReminderPresentVoice(t *testing.T) {
 	}
 }
 
-func TestChannelsForReminderAwayNtfy(t *testing.T) {
+func TestChannelsForReminderAwayAlternatives(t *testing.T) {
 	got := ChannelsForReminder(store.Away)
-	if len(got) != 1 || got[0] != ChannelNtfy {
-		t.Fatalf("reminder away: want [ntfy], got %v", got)
+	if len(got) != 2 || got[0] != ChannelNtfy || got[1] != ChannelTelegram {
+		t.Fatalf("reminder away: want [ntfy telegram], got %v", got)
 	}
 }
 
@@ -353,8 +384,9 @@ func TestDispatchReminderPresentVoice(t *testing.T) {
 
 func TestDispatchReminderAwayNtfy(t *testing.T) {
 	ntfy := &fakeSink{}
+	telegram := &fakeSink{}
 	rc := &fakeReminderCompleter{}
-	d := NewDispatcher(Config{Ntfy: ntfy, Reminders: rc})
+	d := NewDispatcher(Config{Ntfy: ntfy, Telegram: telegram, Reminders: rc})
 
 	rd := loop.ReminderDecision{
 		Reminder: store.Reminder{ID: 7, Status: "pending"},
@@ -369,6 +401,9 @@ func TestDispatchReminderAwayNtfy(t *testing.T) {
 	if len(out) != 1 || out[0].Sendable.Channel != ChannelNtfy {
 		t.Fatalf("want 1 ntfy, got %+v", out)
 	}
+	if len(telegram.sends) != 0 {
+		t.Fatalf("ntfy succeeded; telegram must not receive a duplicate, got %d sends", len(telegram.sends))
+	}
 	// away channel gets summary, not body
 	if ntfy.sends[0].Summary != "wake up" {
 		t.Fatalf("ntfy summary: want 'wake up', got %q", ntfy.sends[0].Summary)
@@ -378,6 +413,203 @@ func TestDispatchReminderAwayNtfy(t *testing.T) {
 	}
 }
 
+func TestDispatchReminderAwayNtfyFailureFallsBackToTelegram(t *testing.T) {
+	ntfy := &fakeSink{err: errors.New("ntfy unavailable")}
+	telegram := &fakeSink{}
+	rc := &fakeReminderCompleter{}
+	ob := &fakeOutbox{}
+	d := NewDispatcher(Config{Ntfy: ntfy, Telegram: telegram, Reminders: rc, Outbox: ob})
+
+	out, err := d.DispatchReminder(context.Background(), PhrasedReminder{
+		Decision: loop.ReminderDecision{
+			Reminder: store.Reminder{ID: 8, Status: "pending"},
+			State:    loop.State{Now: refNow(), Presence: store.Away},
+		},
+		Body: "full medication detail", Summary: "take medication",
+	}, refNow())
+	if err != nil {
+		t.Fatalf("dispatch: %v", err)
+	}
+	if len(out) != 1 || out[0].Sendable.Channel != ChannelTelegram || len(telegram.sends) != 1 {
+		t.Fatalf("want one telegram fallback, got out=%+v sends=%d", out, len(telegram.sends))
+	}
+	if got := messageForChannel(telegram.sends[0]); got != "take medication" {
+		t.Fatalf("telegram fallback must retain the minimal away body, got %q", got)
+	}
+	if len(rc.marked) != 1 || rc.marked[0].id != 8 || rc.marked[0].status != "fired" {
+		t.Fatalf("successful fallback must complete the reminder, got %+v", rc.marked)
+	}
+	if len(ob.attempts) != 2 || ob.attempts[0].channel != "ntfy" || ob.attempts[0].status != store.DeliveryFailed ||
+		ob.attempts[1].channel != "telegram" || ob.attempts[1].status != store.DeliverySent {
+		t.Fatalf("want ntfy failed then telegram sent attempts, got %+v", ob.attempts)
+	}
+}
+
+func TestDispatchReminderAwayNilNtfyFallsBackVisibly(t *testing.T) {
+	telegram := &fakeSink{}
+	rc := &fakeReminderCompleter{}
+	ob := &fakeOutbox{}
+	d := NewDispatcher(Config{Telegram: telegram, Reminders: rc, Outbox: ob})
+
+	out, err := d.DispatchReminder(context.Background(), PhrasedReminder{
+		Decision: loop.ReminderDecision{
+			Reminder: store.Reminder{ID: 9, Status: "pending"},
+			State:    loop.State{Now: refNow(), Presence: store.Away},
+		},
+		Body: "full detail", Summary: "short reminder",
+	}, refNow())
+	if err != nil {
+		t.Fatalf("dispatch: %v", err)
+	}
+	if len(out) != 1 || out[0].Sendable.Channel != ChannelTelegram || len(telegram.sends) != 1 {
+		t.Fatalf("want one telegram fallback, got out=%+v sends=%d", out, len(telegram.sends))
+	}
+	if len(ob.attempts) != 2 || ob.attempts[0].channel != "ntfy" || ob.attempts[0].status != store.DeliveryFailed ||
+		ob.attempts[1].channel != "telegram" || ob.attempts[1].status != store.DeliverySent {
+		t.Fatalf("nil ntfy must leave a failed row before telegram succeeds, got %+v", ob.attempts)
+	}
+	if len(rc.marked) != 1 || rc.marked[0].id != 9 {
+		t.Fatalf("successful fallback must complete the reminder, got %+v", rc.marked)
+	}
+}
+
+func TestDispatchReminderAwayAllAlternativesFailStaysPending(t *testing.T) {
+	ntfy := &fakeSink{err: errors.New("ntfy unavailable")}
+	telegram := &fakeSink{err: errors.New("telegram unavailable")}
+	rc := &fakeReminderCompleter{}
+	ob := &fakeOutbox{}
+	d := NewDispatcher(Config{Ntfy: ntfy, Telegram: telegram, Reminders: rc, Outbox: ob})
+
+	out, err := d.DispatchReminder(context.Background(), PhrasedReminder{
+		Decision: loop.ReminderDecision{
+			Reminder: store.Reminder{ID: 10, Status: "pending"},
+			State:    loop.State{Now: refNow(), Presence: store.Away},
+		},
+		Body: "full detail", Summary: "short reminder",
+	}, refNow())
+	if err == nil {
+		t.Fatal("all alternatives failed: want an error")
+	}
+	if len(out) != 0 || len(rc.marked) != 0 || len(rc.rescheduled) != 0 {
+		t.Fatalf("failed reminder must stay pending, got out=%+v marked=%+v rescheduled=%+v", out, rc.marked, rc.rescheduled)
+	}
+	if len(ob.attempts) != 2 || ob.attempts[0].status != store.DeliveryFailed || ob.attempts[1].status != store.DeliveryFailed {
+		t.Fatalf("want two failed attempts, got %+v", ob.attempts)
+	}
+}
+
+func TestDispatchReminderAllPermanentAlternativesBlockGroup(t *testing.T) {
+	permanent := fmt.Errorf("%w: credentials rejected", ErrPermanent)
+	ntfy := &fakeSink{err: permanent}
+	telegram := &fakeSink{err: permanent}
+	rc := &fakeReminderCompleter{}
+	d := NewDispatcher(Config{Ntfy: ntfy, Telegram: telegram, Reminders: rc})
+	now := refNow()
+	originals := []store.Reminder{
+		{ID: 21, Status: store.ReminderPending, NextFireTs: now, DeliveryGroup: "reminder:permanent"},
+		{ID: 22, Status: store.ReminderPending, NextFireTs: now, DeliveryGroup: "reminder:permanent"},
+	}
+
+	_, err := d.DispatchReminder(context.Background(), PhrasedReminder{
+		Decision: loop.ReminderDecision{
+			Reminder: store.Reminder{ID: 0, Status: store.ReminderPending, Collapsed: originals},
+			State:    loop.State{Now: now, Presence: store.Away},
+		}, Body: "details", Summary: "two reminders",
+	}, now)
+	if err == nil || !errors.Is(err, ErrPermanent) {
+		t.Fatalf("permanent alternatives error = %v", err)
+	}
+	if len(ntfy.sends) != 0 || len(telegram.sends) != 0 {
+		// fakeSink records only successes, so this also asserts neither was
+		// mistaken for a successful delivery.
+		t.Fatalf("permanent failure produced successful sends: ntfy=%d telegram=%d", len(ntfy.sends), len(telegram.sends))
+	}
+	if len(rc.blocked) != 2 || rc.blocked[0] != 21 || rc.blocked[1] != 22 || rc.blockReason == "" {
+		t.Fatalf("permanent bundle was not durably blocked: ids=%v reason=%q", rc.blocked, rc.blockReason)
+	}
+}
+
+func TestDispatchReminderWithUnrecordableOutboxDoesNotSend(t *testing.T) {
+	telegram := &fakeSink{}
+	rc := &fakeReminderCompleter{}
+	ob := &fakeOutbox{beginErr: errors.New("database unavailable")}
+	d := NewDispatcher(Config{Telegram: telegram, Reminders: rc, Outbox: ob})
+
+	out, err := d.DispatchReminder(context.Background(), PhrasedReminder{
+		Decision: loop.ReminderDecision{
+			Reminder: store.Reminder{ID: 11, Status: "pending", DeliveryGroup: "reminder:11"},
+			State:    loop.State{Now: refNow(), Presence: store.Away},
+		},
+		Body: "full detail", Summary: "short reminder",
+	}, refNow())
+	if err == nil {
+		t.Fatal("unrecordable reminder attempt must be withheld")
+	}
+	if len(out) != 0 || len(telegram.sends) != 0 || len(rc.marked) != 0 {
+		t.Fatalf("unrecordable reminder escaped durable boundary: out=%+v sends=%d completed=%+v", out, len(telegram.sends), rc.marked)
+	}
+}
+
+func TestDispatchReminderOutboxCompletionAmbiguityDoesNotCompleteOccurrence(t *testing.T) {
+	telegram := &fakeSink{}
+	rc := &fakeReminderCompleter{}
+	ob := &fakeOutbox{completeErr: errors.New("database unavailable after send")}
+	d := NewDispatcher(Config{Telegram: telegram, Reminders: rc, Outbox: ob})
+
+	out, err := d.DispatchReminder(context.Background(), PhrasedReminder{
+		Decision: loop.ReminderDecision{
+			Reminder: store.Reminder{ID: 12, Status: store.ReminderPending, DeliveryGroup: "reminder:12"},
+			State:    loop.State{Now: refNow(), Presence: store.Away},
+		},
+		Body: "full detail", Summary: "short reminder",
+	}, refNow())
+	if err == nil {
+		t.Fatal("ambiguous outbox completion must surface an error")
+	}
+	if len(out) != 1 || out[0].Sendable.Channel != ChannelTelegram || len(telegram.sends) != 1 {
+		t.Fatalf("the accepted external send must be reported once: out=%+v sends=%d", out, len(telegram.sends))
+	}
+	if len(rc.marked) != 0 || len(rc.rescheduled) != 0 {
+		t.Fatalf("ambiguous accepted send completed the occurrence: marked=%+v rescheduled=%+v", rc.marked, rc.rescheduled)
+	}
+	if len(ob.attempts) != 2 || ob.attempts[1].status != store.DeliveryPending {
+		t.Fatalf("accepted send should remain pending for startup reconciliation: %+v", ob.attempts)
+	}
+}
+
+func TestDispatchReminderCollapsedOutboxUsesRealIDAndSharedGroup(t *testing.T) {
+	telegram := &fakeSink{}
+	rc := &fakeReminderCompleter{}
+	ob := &fakeOutbox{}
+	d := NewDispatcher(Config{Telegram: telegram, Reminders: rc, Outbox: ob})
+	now := refNow()
+	originals := []store.Reminder{
+		{ID: 81, Status: store.ReminderPending, NextFireTs: now, DeliveryGroup: "reminder:bundle"},
+		{ID: 82, Status: store.ReminderPending, NextFireTs: now, DeliveryGroup: "reminder:bundle"},
+	}
+
+	if _, err := d.DispatchReminder(context.Background(), PhrasedReminder{
+		Decision: loop.ReminderDecision{
+			Reminder: store.Reminder{ID: 0, Status: store.ReminderPending, Collapsed: originals},
+			State:    loop.State{Now: now, Presence: store.Away},
+		},
+		Body: "two reminders", Summary: "two reminders",
+	}, now); err != nil {
+		t.Fatalf("dispatch: %v", err)
+	}
+	if len(ob.attempts) != 2 {
+		t.Fatalf("attempts=%d, want nil-ntfy plus telegram", len(ob.attempts))
+	}
+	for _, a := range ob.attempts {
+		if a.reminderID != 81 || a.deliveryGroup != "reminder:bundle" {
+			t.Fatalf("synthetic ID escaped into outbox: %+v", a)
+		}
+	}
+	if len(rc.marked) != 2 || rc.marked[0].id != 81 || rc.marked[1].id != 82 {
+		t.Fatalf("collapsed completion did not cover originals: %+v", rc.marked)
+	}
+}
+
 func TestDispatchReminderFailedSendNotMarkedFired(t *testing.T) {
 	// a failed send must not mark the reminder fired — it stays pending for
 	// the next tick to re-deliver. same instinct as "record after success."
@@ -486,11 +718,12 @@ func TestDispatchNudgeVoiceNoSessionSev2Drops(t *testing.T) {
 }
 
 func TestDispatchReminderVoiceNoSessionRoutesNtfy(t *testing.T) {
-	// present reminder → [voice]. voice has no session → away = ntfy.
+	// present reminder → [voice]. voice has no session → away starts at ntfy.
 	voice := &fakeSink{err: ErrVoiceNoSession}
 	ntfy := &fakeSink{}
+	telegram := &fakeSink{}
 	rc := &fakeReminderCompleter{}
-	d := NewDispatcher(Config{Voice: voice, Ntfy: ntfy, Reminders: rc})
+	d := NewDispatcher(Config{Voice: voice, Ntfy: ntfy, Telegram: telegram, Reminders: rc})
 
 	rd := loop.ReminderDecision{
 		Reminder: store.Reminder{ID: 99, Status: "pending"},
@@ -505,6 +738,9 @@ func TestDispatchReminderVoiceNoSessionRoutesNtfy(t *testing.T) {
 	if len(ntfy.sends) != 1 || len(out) != 1 || out[0].Sendable.Channel != ChannelNtfy {
 		t.Fatalf("reminder voice-no-session: want 1 ntfy, got ntfy=%d out=%+v", len(ntfy.sends), out)
 	}
+	if len(telegram.sends) != 0 {
+		t.Fatalf("successful ntfy fallback must stop before telegram, got %d sends", len(telegram.sends))
+	}
 	if len(rc.marked) != 1 || rc.marked[0].status != "fired" {
 		t.Fatalf("rerouted reminder must be marked fired: %+v", rc.marked)
 	}
@@ -641,6 +877,7 @@ func TestDispatchRecurringReminderReschedules(t *testing.T) {
 type outboxAttempt struct {
 	kind, rule      string
 	reminderID      int64
+	deliveryGroup   string
 	channel, hash   string
 	status          string
 	begunAt, doneAt time.Time
@@ -659,13 +896,13 @@ type fakeOutbox struct {
 	completeErr error
 }
 
-func (f *fakeOutbox) BeginDeliveryAttempt(_ context.Context, kind, rule string, reminderID int64, channel, hash string, now time.Time) (int64, error) {
+func (f *fakeOutbox) BeginDeliveryAttempt(_ context.Context, kind, rule string, reminderID int64, deliveryGroup, channel, hash string, now time.Time) (int64, error) {
 	if f.beginErr != nil {
 		return 0, f.beginErr
 	}
 	f.nextID++
 	f.attempts = append(f.attempts, &outboxAttempt{
-		kind: kind, rule: rule, reminderID: reminderID, channel: channel, hash: hash,
+		kind: kind, rule: rule, reminderID: reminderID, deliveryGroup: deliveryGroup, channel: channel, hash: hash,
 		status: "pending", begunAt: now,
 	})
 	return f.nextID, nil
@@ -985,8 +1222,8 @@ func TestPanicInReminderSinkResolvesTheAttempt(t *testing.T) {
 		},
 		Body: "звонок", Summary: "звонок",
 	}, refNow())
-	if err != nil {
-		t.Fatalf("a panicking sink must not fail the dispatch: %v", err)
+	if err == nil {
+		t.Fatal("a panicking sole reminder sink must report delivery failure")
 	}
 	if len(out) != 0 {
 		t.Fatalf("nothing was delivered, want no dispatches, got %+v", out)
diff --git a/internal/delivery/durability_test.go b/internal/delivery/durability_test.go
index 5f3e00b..0d265e1 100644
--- a/internal/delivery/durability_test.go
+++ b/internal/delivery/durability_test.go
@@ -122,7 +122,7 @@ func TestCrashBetweenBeginAndCompleteBecomesUnknown(t *testing.T) {
 	sink := &fakeSink{}
 
 	// the crash: intent recorded, no completion.
-	id, err := st.BeginDeliveryAttempt(ctx, "nudge", "disk_low", 0, "telegram", "hash", refNow())
+	id, err := st.BeginDeliveryAttempt(ctx, "nudge", "disk_low", 0, "", "telegram", "hash", refNow())
 	if err != nil {
 		t.Fatalf("begin: %v", err)
 	}
@@ -172,7 +172,7 @@ func TestUnknownIsNeverResolvedToSentOrFailed(t *testing.T) {
 	st := openTestStore(t)
 	ctx := context.Background()
 
-	id, err := st.BeginDeliveryAttempt(ctx, "nudge", "disk_low", 0, "telegram", "hash", refNow())
+	id, err := st.BeginDeliveryAttempt(ctx, "nudge", "disk_low", 0, "", "telegram", "hash", refNow())
 	if err != nil {
 		t.Fatalf("begin: %v", err)
 	}
diff --git a/internal/delivery/ntfysink/ntfysink.go b/internal/delivery/ntfysink/ntfysink.go
index 5942951..b0a4c66 100644
--- a/internal/delivery/ntfysink/ntfysink.go
+++ b/internal/delivery/ntfysink/ntfysink.go
@@ -37,6 +37,12 @@ import (
 // the credential lives in the daemon's config (or a systemd credential),
 // never in the binary.
 type Config struct {
+	// Disabled keeps a written endpoint explicitly dark. This is distinct from
+	// an expanded-empty credential: the latter is a configuration error, while
+	// this flag records an operator decision to use another delivery reach until
+	// credentials are provisioned.
+	Disabled bool `json:"disabled,omitempty"`
+
 	// BaseURL — the ntfy server, no trailing path. Required.
 	BaseURL string `json:"base_url"`
 
@@ -71,23 +77,45 @@ type Sink struct {
 	hc  *http.Client
 }
 
-// New validates the config and builds the sink. BaseURL and Topic are
-// required; auth is optional (but deny-all servers reject unauthed publishes).
-func New(cfg Config) (*Sink, error) {
-	if cfg.BaseURL == "" {
-		return nil, fmt.Errorf("ntfysink: BaseURL is required")
+// Validate checks one configuration without constructing a client. A disabled
+// block is the only state in which credentials may be empty. Maven's ntfy
+// reach is private, and accepting an accidental anonymous configuration turns
+// a missing environment variable into an endless 403 retry loop.
+func Validate(cfg Config) error {
+	if cfg.Disabled {
+		return nil
+	}
+	if strings.TrimSpace(cfg.BaseURL) == "" {
+		return fmt.Errorf("ntfysink: BaseURL is required while enabled")
 	}
 	if _, err := url.Parse(cfg.BaseURL); err != nil {
-		return nil, fmt.Errorf("ntfysink: bad BaseURL: %w", err)
+		return fmt.Errorf("ntfysink: bad BaseURL: %w", err)
 	}
-	if cfg.Topic == "" {
-		return nil, fmt.Errorf("ntfysink: Topic is required")
+	if strings.TrimSpace(cfg.Topic) == "" {
+		return fmt.Errorf("ntfysink: Topic is required while enabled")
 	}
 	// Refuse rather than pick. Two credentials configured means someone
 	// intended one of them, and guessing which would send the other nowhere
 	// and leave a working config that is not the one they wrote.
-	if cfg.Token != "" && cfg.Username != "" {
-		return nil, fmt.Errorf("ntfysink: set Token or Username, not both")
+	if strings.TrimSpace(cfg.Token) != "" && (strings.TrimSpace(cfg.Username) != "" || cfg.Password != "") {
+		return fmt.Errorf("ntfysink: set Token or Username/Password, not both")
+	}
+	if strings.TrimSpace(cfg.Token) == "" {
+		if strings.TrimSpace(cfg.Username) == "" || cfg.Password == "" {
+			return fmt.Errorf("ntfysink: Token or Username/Password is required while enabled")
+		}
+	}
+	return nil
+}
+
+// New validates the config and builds the sink. Disabled configs belong at the
+// daemon wiring boundary and cannot accidentally become live sinks.
+func New(cfg Config) (*Sink, error) {
+	if cfg.Disabled {
+		return nil, fmt.Errorf("ntfysink: config is disabled")
+	}
+	if err := Validate(cfg); err != nil {
+		return nil, err
 	}
 	to := cfg.Timeout
 	if to == 0 {
@@ -127,6 +155,10 @@ func (s *Sink) Send(ctx context.Context, d delivery.Sendable) error {
 	defer resp.Body.Close()
 	if resp.StatusCode/100 != 2 {
 		rb, _ := io.ReadAll(io.LimitReader(resp.Body, 512))
+		if resp.StatusCode == http.StatusUnauthorized || resp.StatusCode == http.StatusForbidden {
+			return fmt.Errorf("%w: ntfysink: credentials rejected (%d): %s",
+				delivery.ErrPermanent, resp.StatusCode, strings.TrimSpace(string(rb)))
+		}
 		return fmt.Errorf("ntfysink: ntfy returned %d: %s", resp.StatusCode, strings.TrimSpace(string(rb)))
 	}
 	return nil
diff --git a/internal/delivery/ntfysink/ntfysink_test.go b/internal/delivery/ntfysink/ntfysink_test.go
index f7a0172..5fb1991 100644
--- a/internal/delivery/ntfysink/ntfysink_test.go
+++ b/internal/delivery/ntfysink/ntfysink_test.go
@@ -2,6 +2,7 @@ package ntfysink
 
 import (
 	"context"
+	"errors"
 	"io"
 	"net/http"
 	"net/http/httptest"
@@ -81,6 +82,10 @@ func reminderSendable(summary string) delivery.Sendable {
 	}
 }
 
+func tokenConfig(baseURL string) Config {
+	return Config{BaseURL: baseURL, Topic: "maven", Token: "scoped-write-token"}
+}
+
 // ----------------------------- config ---------------------------------------
 
 func TestNewRejectsEmptyBaseURL(t *testing.T) {
@@ -98,7 +103,7 @@ func TestNewRejectsEmptyTopic(t *testing.T) {
 }
 
 func TestNewDefaultTimeout(t *testing.T) {
-	s, err := New(Config{BaseURL: "http://localhost:8085", Topic: "maven"})
+	s, err := New(tokenConfig("http://localhost:8085"))
 	if err != nil {
 		t.Fatalf("New: %v", err)
 	}
@@ -107,6 +112,26 @@ func TestNewDefaultTimeout(t *testing.T) {
 	}
 }
 
+func TestNewRejectsAnonymousPublishing(t *testing.T) {
+	_, err := New(Config{BaseURL: "http://localhost:8085", Topic: "maven"})
+	if err == nil {
+		t.Fatal("New accepted a topic with no credential")
+	}
+	if !strings.Contains(err.Error(), "required while enabled") {
+		t.Fatalf("error should identify the enabled reach: %v", err)
+	}
+}
+
+func TestValidateAllowsEmptyCredentialOnlyWhenDisabled(t *testing.T) {
+	cfg := Config{Disabled: true, BaseURL: "http://localhost:8085", Topic: "maven"}
+	if err := Validate(cfg); err != nil {
+		t.Fatalf("Validate disabled config: %v", err)
+	}
+	if _, err := New(cfg); err == nil {
+		t.Fatal("New built a live sink from a disabled config")
+	}
+}
+
 // ----------------------------- send shape ----------------------------------
 
 func TestSendPostsToTopicPath(t *testing.T) {
@@ -114,7 +139,7 @@ func TestSendPostsToTopicPath(t *testing.T) {
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
 
-	sink, err := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, err := New(tokenConfig(srv.URL))
 	if err != nil {
 		t.Fatalf("New: %v", err)
 	}
@@ -137,7 +162,7 @@ func TestSendBodyIsSummaryNotFullBody(t *testing.T) {
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
 
-	sink, _ := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, _ := New(tokenConfig(srv.URL))
 	if err := sink.Send(context.Background(), nudgeSendable(loop.Sev3, "cert expiring soon")); err != nil {
 		t.Fatalf("Send: %v", err)
 	}
@@ -155,7 +180,7 @@ func TestSendNeverSendsTheBodyWhenSummaryEmpty(t *testing.T) {
 	defer srv.Close()
 
 	s := nudgeSendable(loop.Sev3, "")
-	sink, _ := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, _ := New(tokenConfig(srv.URL))
 	if err := sink.Send(context.Background(), s); err != nil {
 		t.Fatalf("Send: %v", err)
 	}
@@ -173,7 +198,7 @@ func TestSendNeverSendsAnEmptyMessage(t *testing.T) {
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
 
-	sink, _ := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, _ := New(tokenConfig(srv.URL))
 	s := nudgeSendable(loop.Sev3, "")
 	s.Body = ""
 	s.RuleName = ""
@@ -209,18 +234,18 @@ func TestSendSetsBasicAuth(t *testing.T) {
 	}
 }
 
-func TestSendNoAuthWhenUsernameEmpty(t *testing.T) {
+func TestTokenConfigSendsBearerAuth(t *testing.T) {
 	rs := newRecordingServer(t, 200, "")
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
 
-	sink, _ := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, _ := New(tokenConfig(srv.URL))
 	if err := sink.Send(context.Background(), nudgeSendable(loop.Sev3, "down")); err != nil {
 		t.Fatalf("Send: %v", err)
 	}
 	_, _, _, auth, _, _ := rs.snapshot()
-	if auth != "" {
-		t.Fatalf("want no auth header, got %q", auth)
+	if auth != "Bearer scoped-write-token" {
+		t.Fatalf("want bearer auth header, got %q", auth)
 	}
 }
 
@@ -260,7 +285,7 @@ func TestSendTitleIsMaven(t *testing.T) {
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
 
-	sink, _ := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, _ := New(tokenConfig(srv.URL))
 	if err := sink.Send(context.Background(), nudgeSendable(loop.Sev3, "down")); err != nil {
 		t.Fatalf("Send: %v", err)
 	}
@@ -277,7 +302,7 @@ func TestPrioritySev3IsHigh(t *testing.T) {
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
 
-	sink, _ := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, _ := New(tokenConfig(srv.URL))
 	_ = sink.Send(context.Background(), nudgeSendable(loop.Sev3, "cert"))
 	_, _, _, _, _, prio := rs.snapshot()
 	if prio != "4" {
@@ -290,7 +315,7 @@ func TestPrioritySev4IsMax(t *testing.T) {
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
 
-	sink, _ := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, _ := New(tokenConfig(srv.URL))
 	_ = sink.Send(context.Background(), nudgeSendable(loop.Sev4, "down"))
 	_, _, _, _, _, prio := rs.snapshot()
 	if prio != "5" {
@@ -303,7 +328,7 @@ func TestPriorityReminderIsHigh(t *testing.T) {
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
 
-	sink, _ := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, _ := New(tokenConfig(srv.URL))
 	_ = sink.Send(context.Background(), reminderSendable("wake up"))
 	_, _, _, _, _, prio := rs.snapshot()
 	if prio != "4" {
@@ -318,7 +343,7 @@ func TestSendReturnsErrorOnNon2xx(t *testing.T) {
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
 
-	sink, _ := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, _ := New(tokenConfig(srv.URL))
 	err := sink.Send(context.Background(), nudgeSendable(loop.Sev3, "down"))
 	if err == nil {
 		t.Fatal("want error on 403")
@@ -326,6 +351,24 @@ func TestSendReturnsErrorOnNon2xx(t *testing.T) {
 	if !strings.Contains(err.Error(), "403") {
 		t.Fatalf("error should mention status 403, got: %v", err)
 	}
+	if !errors.Is(err, delivery.ErrPermanent) {
+		t.Fatalf("403 = %v; want delivery.ErrPermanent", err)
+	}
+}
+
+func TestSendServerFailureRemainsRetryable(t *testing.T) {
+	rs := newRecordingServer(t, http.StatusServiceUnavailable, `{"error":"temporarily unavailable"}`)
+	srv := httptest.NewServer(rs.handler())
+	defer srv.Close()
+
+	sink, _ := New(tokenConfig(srv.URL))
+	err := sink.Send(context.Background(), nudgeSendable(loop.Sev3, "down"))
+	if err == nil {
+		t.Fatal("want error on 503")
+	}
+	if errors.Is(err, delivery.ErrPermanent) {
+		t.Fatalf("503 was marked permanent: %v", err)
+	}
 }
 
 func TestSendContextCancelReturnsError(t *testing.T) {
@@ -333,7 +376,7 @@ func TestSendContextCancelReturnsError(t *testing.T) {
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
 
-	sink, _ := New(Config{BaseURL: srv.URL, Topic: "maven"})
+	sink, _ := New(tokenConfig(srv.URL))
 	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Nanosecond)
 	defer cancel()
 	err := sink.Send(ctx, nudgeSendable(loop.Sev3, "down"))
@@ -343,7 +386,9 @@ func TestSendContextCancelReturnsError(t *testing.T) {
 }
 
 func TestSendConnectionRefusedReturnsError(t *testing.T) {
-	sink, _ := New(Config{BaseURL: "http://127.0.0.1:1", Topic: "maven", Timeout: time.Second})
+	cfg := tokenConfig("http://127.0.0.1:1")
+	cfg.Timeout = time.Second
+	sink, _ := New(cfg)
 	err := sink.Send(context.Background(), nudgeSendable(loop.Sev3, "down"))
 	if err == nil {
 		t.Fatal("want error on connection refused")
diff --git a/internal/delivery/telegramsink/telegramsink.go b/internal/delivery/telegramsink/telegramsink.go
index b4016ee..eb1d828 100644
--- a/internal/delivery/telegramsink/telegramsink.go
+++ b/internal/delivery/telegramsink/telegramsink.go
@@ -51,6 +51,11 @@ const DefaultTimeout = 10 * time.Second
 // config file; the bot token + chat id live in the daemon's config (or a
 // systemd credential), never in the binary.
 type Config struct {
+	// Disabled keeps a written Telegram block explicitly dark. A present block
+	// is otherwise live, so an expanded-empty credential is a configuration
+	// error rather than an implicit opt-out.
+	Disabled bool `json:"disabled,omitempty"`
+
 	// BotToken — the telegram bot token from BotFather. required. sent in the
 	// URL path (the only place telegram accepts it), not in the body.
 	BotToken string `json:"bot_token"`
@@ -91,27 +96,47 @@ type Sink struct {
 	base string // resolved BaseURL, no trailing slash
 }
 
-// New validates the config and builds the sink. BotToken and ChatID are
-// required; Proxy and BaseURL are optional.
-func New(cfg Config) (*Sink, error) {
-	if cfg.BotToken == "" {
-		return nil, fmt.Errorf("telegramsink: BotToken is required")
+// Validate checks one configuration without constructing a client. A disabled
+// block is valid and intentionally carries no credentials; every live block
+// must carry both secrets and valid endpoint URLs.
+func Validate(cfg Config) error {
+	if cfg.Disabled {
+		return nil
 	}
-	if cfg.ChatID == "" {
-		return nil, fmt.Errorf("telegramsink: ChatID is required")
+	if strings.TrimSpace(cfg.BotToken) == "" {
+		return fmt.Errorf("telegramsink: BotToken is required while enabled")
+	}
+	if strings.TrimSpace(cfg.ChatID) == "" {
+		return fmt.Errorf("telegramsink: ChatID is required while enabled")
 	}
 	base := cfg.BaseURL
 	if base == "" {
 		base = DefaultBaseURL
 	}
 	if _, err := url.Parse(base); err != nil {
-		return nil, fmt.Errorf("telegramsink: bad BaseURL: %w", err)
+		return fmt.Errorf("telegramsink: bad BaseURL: %w", err)
 	}
 	if cfg.Proxy != "" {
 		if _, err := url.Parse(cfg.Proxy); err != nil {
-			return nil, fmt.Errorf("telegramsink: bad Proxy: %w", err)
+			return fmt.Errorf("telegramsink: bad Proxy: %w", err)
 		}
 	}
+	return nil
+}
+
+// New validates the config and builds the sink. Disabled configs belong at the
+// wiring boundary and cannot accidentally become live sinks.
+func New(cfg Config) (*Sink, error) {
+	if cfg.Disabled {
+		return nil, fmt.Errorf("telegramsink: config is disabled")
+	}
+	if err := Validate(cfg); err != nil {
+		return nil, err
+	}
+	base := cfg.BaseURL
+	if base == "" {
+		base = DefaultBaseURL
+	}
 	to := cfg.Timeout
 	if to == 0 {
 		to = DefaultTimeout
@@ -192,7 +217,11 @@ func (s *Sink) Send(ctx context.Context, d delivery.Sendable) error {
 	var tr telegramResp
 	jsonErr := json.Unmarshal(rb, &tr)
 	if jsonErr == nil && !tr.Ok {
-		return fmt.Errorf("telegramsink: telegram returned error %d: %s", tr.ErrorCode, strings.TrimSpace(tr.Description))
+		err := fmt.Errorf("telegramsink: telegram returned error %d: %s", tr.ErrorCode, strings.TrimSpace(tr.Description))
+		if tr.ErrorCode == http.StatusUnauthorized || tr.ErrorCode == http.StatusForbidden {
+			return fmt.Errorf("%w: %v", delivery.ErrPermanent, err)
+		}
+		return err
 	}
 	if resp.StatusCode/100 != 2 {
 		return fmt.Errorf("telegramsink: telegram returned %d: %s", resp.StatusCode, snippet(rb))
diff --git a/internal/delivery/telegramsink/telegramsink_test.go b/internal/delivery/telegramsink/telegramsink_test.go
index d806fc4..22fb9eb 100644
--- a/internal/delivery/telegramsink/telegramsink_test.go
+++ b/internal/delivery/telegramsink/telegramsink_test.go
@@ -106,6 +106,16 @@ func TestNewRejectsEmptyChatID(t *testing.T) {
 	}
 }
 
+func TestValidateAllowsEmptySecretsOnlyWhenDisabled(t *testing.T) {
+	cfg := Config{Disabled: true}
+	if err := Validate(cfg); err != nil {
+		t.Fatalf("Validate disabled config: %v", err)
+	}
+	if _, err := New(cfg); err == nil {
+		t.Fatal("New built a live sink from a disabled config")
+	}
+}
+
 func TestNewDefaultTimeout(t *testing.T) {
 	s, err := New(Config{BotToken: "123:abc", ChatID: "42"})
 	if err != nil {
@@ -289,6 +299,9 @@ func TestSendReturnsErrorOnTelegramError(t *testing.T) {
 	if !strings.Contains(err.Error(), "401") {
 		t.Fatalf("error should mention error_code 401, got: %v", err)
 	}
+	if !errors.Is(err, delivery.ErrPermanent) {
+		t.Fatalf("revoked bot credential must be permanent, got: %v", err)
+	}
 }
 
 // A relay that is up but cannot reach api.telegram.org answers 200 with a page
@@ -525,9 +538,9 @@ func TestSendRoutesThroughProxyWhenConfigured(t *testing.T) {
 // ----------------------------- reminder same shape --------------------------
 
 func TestReminderSendUsesSamePath(t *testing.T) {
-	// reminders away route to ntfy, not telegram — but if the daemon ever
-	// routes a reminder via telegram (per-reminder override), the sink must
-	// accept KindReminder undamaged. exercises the kind-agnostic contract.
+	// Telegram is the second away alternative for reminders. If ntfy is
+	// unavailable and the dispatcher falls through, the sink must accept
+	// KindReminder undamaged. exercises the kind-agnostic contract.
 	rs := newRecordingServer(t, 200, "")
 	srv := httptest.NewServer(rs.handler())
 	defer srv.Close()
diff --git a/internal/ipc/api.go b/internal/ipc/api.go
index db90185..cdf8074 100644
--- a/internal/ipc/api.go
+++ b/internal/ipc/api.go
@@ -63,14 +63,15 @@ type Nudge struct {
 // DeliveryAttempt — one row of the delivery outbox. Times are formatted by the
 // reader; Completed is nil while the attempt is still pending.
 type DeliveryAttempt struct {
-	ID         int64      `json:"id"`
-	Kind       string     `json:"kind"`
-	Rule       string     `json:"rule,omitempty"`
-	ReminderID int64      `json:"reminder_id,omitempty"`
-	Channel    string     `json:"channel"`
-	Status     string     `json:"status"`
-	Created    time.Time  `json:"created"`
-	Completed  *time.Time `json:"completed,omitempty"`
+	ID            int64      `json:"id"`
+	Kind          string     `json:"kind"`
+	Rule          string     `json:"rule,omitempty"`
+	ReminderID    int64      `json:"reminder_id,omitempty"`
+	DeliveryGroup string     `json:"delivery_group,omitempty"`
+	Channel       string     `json:"channel"`
+	Status        string     `json:"status"`
+	Created       time.Time  `json:"created"`
+	Completed     *time.Time `json:"completed,omitempty"`
 }
 
 // Note — a recall/preference item; ranked by embedding cosine on query.
@@ -85,13 +86,18 @@ type Note struct {
 
 // Reminder — user-stated future intent; fires once or recurring (if cron set).
 type Reminder struct {
-	ID         int64     `json:"id"`
-	CreatedTs  time.Time `json:"created_ts"`
-	FireTs     time.Time `json:"fire_ts"`
-	NextFireTs time.Time `json:"next_fire_ts"`
-	Payload    string    `json:"payload"`
-	Status     string    `json:"status"` // pending|fired|cancelled
-	Cron       string    `json:"cron"`
+	ID                   int64     `json:"id"`
+	CreatedTs            time.Time `json:"created_ts"`
+	FireTs               time.Time `json:"fire_ts"`
+	NextFireTs           time.Time `json:"next_fire_ts"`
+	Payload              string    `json:"payload"`
+	Status               string    `json:"status"` // pending|fired|cancelled
+	Cron                 string    `json:"cron"`
+	DeliveryGroup        string    `json:"delivery_group,omitempty"`
+	DeliveryAttempts     int       `json:"delivery_attempts,omitempty"`
+	NextAttemptTs        time.Time `json:"next_attempt_ts,omitempty"`
+	DeliveryBlockedTs    time.Time `json:"delivery_blocked_ts,omitempty"`
+	DeliveryBlockedError string    `json:"delivery_blocked_error,omitempty"`
 }
 
 // Presence — the read the phraser / delivery modules need to decide channel
diff --git a/internal/ipc/maperr_test.go b/internal/ipc/maperr_test.go
index 6ff31fb..e08c384 100644
--- a/internal/ipc/maperr_test.go
+++ b/internal/ipc/maperr_test.go
@@ -42,8 +42,9 @@ var mapErrPairs = []struct {
 // and fails TestMapErrCoversEveryStoreSentinel, which is the point: whether a
 // module can branch on an error is a decision, not a default.
 var unmappedStoreErrors = map[string]string{
-	"ErrKeyLen":  "unlock path — the key never crosses CoreAPI",
-	"ErrDecrypt": "unlock path — the key never crosses CoreAPI",
+	"ErrKeyLen":         "unlock path — the key never crosses CoreAPI",
+	"ErrDecrypt":        "unlock path — the key never crosses CoreAPI",
+	"ErrReminderPhrase": "daemon-internal delivery-state validation; modules neither cache reminder presentations nor branch on this verdict",
 
 	"ErrToolCmd": "write-side validation of an allowlist mutation; the caller is the owner at a step-up, not a module branching on the verdict",
 
diff --git a/internal/ipc/storeapi.go b/internal/ipc/storeapi.go
index a0fe3f2..5c7aebb 100644
--- a/internal/ipc/storeapi.go
+++ b/internal/ipc/storeapi.go
@@ -149,7 +149,7 @@ func (a *storeAPI) DeliveryAttempts(ctx context.Context, status string, n int) (
 	return mapRows(as, err, func(at store.DeliveryAttempt) DeliveryAttempt {
 		out := DeliveryAttempt{
 			ID: at.ID, Kind: at.Kind, Rule: at.Rule, ReminderID: at.ReminderID,
-			Channel: at.Channel, Status: at.Status, Created: at.Created,
+			DeliveryGroup: at.DeliveryGroup, Channel: at.Channel, Status: at.Status, Created: at.Created,
 		}
 		if at.HasComplete {
 			t := at.Completed
@@ -352,13 +352,18 @@ func toTool(t store.Tool) Tool {
 
 func toReminder(r store.Reminder) Reminder {
 	return Reminder{
-		ID:         r.ID,
-		CreatedTs:  r.CreatedTs,
-		FireTs:     r.FireTs,
-		NextFireTs: r.NextFireTs,
-		Payload:    r.Payload,
-		Status:     r.Status,
-		Cron:       r.Cron,
+		ID:                   r.ID,
+		CreatedTs:            r.CreatedTs,
+		FireTs:               r.FireTs,
+		NextFireTs:           r.NextFireTs,
+		Payload:              r.Payload,
+		Status:               r.Status,
+		Cron:                 r.Cron,
+		DeliveryGroup:        r.DeliveryGroup,
+		DeliveryAttempts:     r.DeliveryAttempts,
+		NextAttemptTs:        r.NextAttemptTs,
+		DeliveryBlockedTs:    r.DeliveryBlockedTs,
+		DeliveryBlockedError: r.DeliveryBlockedError,
 	}
 }
 
diff --git a/internal/loop/gather.go b/internal/loop/gather.go
index de5db82..2a756c8 100644
--- a/internal/loop/gather.go
+++ b/internal/loop/gather.go
@@ -12,6 +12,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"sort"
 	"time"
 
 	"github.com/kami/maven/internal/calendar"
@@ -258,16 +259,62 @@ func readFact(ctx context.Context, s *store.Store, key string) (store.Fact, bool
 }
 
 // collapseReminders — when multiple reminders are due at once (e.g. after
-// the daemon was offline), collapse them into a single digest reminder to
-// avoid a burst of individual notifications. The synthetic digest (ID=0)
-// carries the originals in Collapsed; the dispatcher completes them (mark
-// fired / reschedule) only after the digest actually delivers, preserving
-// the "failed send leaves the reminder pending" invariant.
-// When 0 or 1 reminders are due, returns them unchanged.
+// the daemon was offline), collapse them into digest reminders to avoid a
+// burst of individual notifications. A previously phrased delivery group is
+// kept intact and separate from newly-due reminders: otherwise one new row
+// joining a failed bundle would force the old bundle through the model again.
+// The synthetic digest (ID=0) carries the originals in Collapsed; the
+// dispatcher completes them only after the digest actually delivers.
 func collapseReminders(due []store.Reminder) []store.Reminder {
 	if len(due) <= 1 {
 		return due
 	}
+
+	// Every reminder without a delivery group is part of the new bundle for
+	// this tick. Persisted groups each retain their own bundle identity.
+	const ungrouped = "\x00"
+	type reminderGroup struct {
+		key       string
+		reminders []store.Reminder
+	}
+	var groups []reminderGroup
+	byKey := make(map[string]int)
+	for _, r := range due {
+		key := r.DeliveryGroup
+		if key == "" {
+			key = ungrouped
+		}
+		i, ok := byKey[key]
+		if !ok {
+			i = len(groups)
+			byKey[key] = i
+			groups = append(groups, reminderGroup{key: key})
+		}
+		groups[i].reminders = append(groups[i].reminders, r)
+	}
+	// DueReminders was ordered globally. Grouping can move rows together, so
+	// restore earliest-first ordering between the resulting deliveries.
+	sort.SliceStable(groups, func(i, j int) bool {
+		a := groups[i].reminders[0]
+		b := groups[j].reminders[0]
+		if a.NextFireTs.Equal(b.NextFireTs) {
+			return a.ID < b.ID
+		}
+		return a.NextFireTs.Before(b.NextFireTs)
+	})
+
+	out := make([]store.Reminder, 0, len(groups))
+	for _, group := range groups {
+		if len(group.reminders) == 1 {
+			out = append(out, group.reminders[0])
+			continue
+		}
+		out = append(out, collapseReminderGroup(group.reminders))
+	}
+	return out
+}
+
+func collapseReminderGroup(due []store.Reminder) store.Reminder {
 	// Build a summary payload.
 	var items []string
 	earliest := due[0].FireTs
@@ -294,11 +341,11 @@ func collapseReminders(due []store.Reminder) []store.Reminder {
 
 	// Return a single synthetic digest reminder. ID=0 signals "digest" to
 	// the dispatcher, which completes the Collapsed originals on success.
-	return []store.Reminder{{
+	return store.Reminder{
 		ID:        0,
 		FireTs:    earliest,
 		Payload:   string(digestPayload),
-		Status:    "pending",
+		Status:    store.ReminderPending,
 		Collapsed: due,
-	}}
+	}
 }
diff --git a/internal/loop/gather_test.go b/internal/loop/gather_test.go
index b4bc97c..d839e31 100644
--- a/internal/loop/gather_test.go
+++ b/internal/loop/gather_test.go
@@ -47,3 +47,36 @@ func TestGatherStateLoadsPrefixFamilies(t *testing.T) {
 		t.Fatal("the rule must fire on a gathered per-monitor fact")
 	}
 }
+
+func TestCollapseRemindersKeepsPersistedBundleSeparateFromNewDueRows(t *testing.T) {
+	now := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+	due := []store.Reminder{
+		{ID: 1, FireTs: now, NextFireTs: now, Payload: "one", DeliveryGroup: "reminder:old", PhraseBody: "old bundle"},
+		{ID: 2, FireTs: now.Add(time.Second), NextFireTs: now.Add(time.Second), Payload: "two", DeliveryGroup: "reminder:old", PhraseBody: "old bundle"},
+		{ID: 3, FireTs: now.Add(2 * time.Second), NextFireTs: now.Add(2 * time.Second), Payload: "three"},
+	}
+
+	got := collapseReminders(due)
+	if len(got) != 2 {
+		t.Fatalf("deliveries = %d, want old bundle plus new reminder: %+v", len(got), got)
+	}
+	if got[0].ID != 0 || len(got[0].Collapsed) != 2 || got[0].Collapsed[0].ID != 1 || got[0].Collapsed[1].ID != 2 {
+		t.Fatalf("old persisted bundle was changed: %+v", got[0])
+	}
+	if got[1].ID != 3 || len(got[1].Collapsed) != 0 {
+		t.Fatalf("new reminder joined the old phrase: %+v", got[1])
+	}
+}
+
+func TestCollapseRemindersMakesOneBundleForNewDueRows(t *testing.T) {
+	now := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+	due := []store.Reminder{
+		{ID: 1, FireTs: now, NextFireTs: now, Payload: "one"},
+		{ID: 2, FireTs: now, NextFireTs: now, Payload: "two"},
+		{ID: 3, FireTs: now, NextFireTs: now, Payload: "three"},
+	}
+	got := collapseReminders(due)
+	if len(got) != 1 || got[0].ID != 0 || len(got[0].Collapsed) != 3 {
+		t.Fatalf("new reminders did not collapse together: %+v", got)
+	}
+}
diff --git a/internal/store/delivery.go b/internal/store/delivery.go
index 4c016c7..710be9c 100644
--- a/internal/store/delivery.go
+++ b/internal/store/delivery.go
@@ -28,14 +28,16 @@ const (
 // send happens, so a crash between "sent externally" and "recorded" leaves a
 // trace instead of silence. kind is "nudge" or "reminder"; rule is set for
 // nudges, reminderID for reminders (the other left at its zero value).
+// deliveryGroup is the exact persisted reminder occurrence or collapsed
+// bundle; it is empty for nudges and legacy reminder attempts.
 // bodyHash is an opaque caller-computed key (e.g. sha256 of channel+body) —
 // stored for post-crash operator triage, not enforced as a uniqueness
 // constraint (a rule/reminder legitimately re-sends across ticks).
-func (s *Store) BeginDeliveryAttempt(ctx context.Context, kind, rule string, reminderID int64, channel, bodyHash string, now time.Time) (int64, error) {
+func (s *Store) BeginDeliveryAttempt(ctx context.Context, kind, rule string, reminderID int64, deliveryGroup, channel, bodyHash string, now time.Time) (int64, error) {
 	res, err := s.db.ExecContext(ctx,
-		`INSERT INTO delivery_attempts (kind, rule, reminder_id, channel, body_hash, status, created_ts)
-		 VALUES (?, ?, ?, ?, ?, 'pending', ?)`,
-		kind, rule, reminderID, channel, bodyHash, now.UnixMilli())
+		`INSERT INTO delivery_attempts (kind, rule, reminder_id, delivery_group, channel, body_hash, status, created_ts)
+		 VALUES (?, ?, ?, ?, ?, ?, 'pending', ?)`,
+		kind, rule, reminderID, deliveryGroup, channel, bodyHash, now.UnixMilli())
 	if err != nil {
 		return 0, fmt.Errorf("begin delivery attempt: %w", err)
 	}
@@ -90,15 +92,16 @@ func (s *Store) ReconcileStaleDeliveryAttempts(ctx context.Context, now time.Tim
 
 // DeliveryAttempt — one row of the outbox, as a reader sees it.
 type DeliveryAttempt struct {
-	ID          int64
-	Kind        string // nudge|reminder
-	Rule        string // set for nudges
-	ReminderID  int64  // set for reminders
-	Channel     string
-	Status      string // one of the Delivery* constants
-	Created     time.Time
-	Completed   time.Time // zero while pending
-	HasComplete bool
+	ID            int64
+	Kind          string // nudge|reminder
+	Rule          string // set for nudges
+	ReminderID    int64  // set for reminders
+	DeliveryGroup string // exact reminder occurrence/bundle; empty for nudges and legacy rows
+	Channel       string
+	Status        string // one of the Delivery* constants
+	Created       time.Time
+	Completed     time.Time // zero while pending
+	HasComplete   bool
 }
 
 // ListDeliveryAttempts returns recent attempts, newest first. An empty status
@@ -117,7 +120,7 @@ func (s *Store) ListDeliveryAttempts(ctx context.Context, status string, limit i
 	if limit <= 0 {
 		limit = 50
 	}
-	q := `SELECT id, kind, rule, reminder_id, channel, status, created_ts, completed_ts
+	q := `SELECT id, kind, rule, reminder_id, delivery_group, channel, status, created_ts, completed_ts
 	        FROM delivery_attempts`
 	args := []any{}
 	if status != "" {
@@ -138,7 +141,7 @@ func (s *Store) ListDeliveryAttempts(ctx context.Context, status string, limit i
 		var a DeliveryAttempt
 		var created int64
 		var completed *int64
-		if err := rows.Scan(&a.ID, &a.Kind, &a.Rule, &a.ReminderID, &a.Channel, &a.Status, &created, &completed); err != nil {
+		if err := rows.Scan(&a.ID, &a.Kind, &a.Rule, &a.ReminderID, &a.DeliveryGroup, &a.Channel, &a.Status, &created, &completed); err != nil {
 			return nil, fmt.Errorf("list delivery attempts: scan: %w", err)
 		}
 		a.Created = time.UnixMilli(created)
diff --git a/internal/store/delivery_test.go b/internal/store/delivery_test.go
index d261448..936b911 100644
--- a/internal/store/delivery_test.go
+++ b/internal/store/delivery_test.go
@@ -15,7 +15,7 @@ func TestDroppedDeliveryAttemptRoundTrips(t *testing.T) {
 	ctx := context.Background()
 	now := time.Now()
 
-	id, err := s.BeginDeliveryAttempt(ctx, "nudge", "water", 0, "drop", "abc123", now)
+	id, err := s.BeginDeliveryAttempt(ctx, "nudge", "water", 0, "", "drop", "abc123", now)
 	if err != nil {
 		t.Fatalf("BeginDeliveryAttempt: %v", err)
 	}
@@ -40,21 +40,21 @@ func TestListDeliveryAttempts(t *testing.T) {
 	s := newTestStore(t)
 	base := time.Date(2026, 8, 4, 9, 0, 0, 0, time.UTC)
 
-	sent, err := s.BeginDeliveryAttempt(ctx, "nudge", "water", 0, "telegram", "h1", base)
+	sent, err := s.BeginDeliveryAttempt(ctx, "nudge", "water", 0, "", "telegram", "h1", base)
 	if err != nil {
 		t.Fatal(err)
 	}
 	if err := s.CompleteDeliveryAttempt(ctx, sent, DeliverySent, base.Add(time.Second)); err != nil {
 		t.Fatal(err)
 	}
-	dropped, err := s.BeginDeliveryAttempt(ctx, "nudge", "care", 0, "telegram", "h2", base.Add(time.Minute))
+	dropped, err := s.BeginDeliveryAttempt(ctx, "nudge", "care", 0, "", "telegram", "h2", base.Add(time.Minute))
 	if err != nil {
 		t.Fatal(err)
 	}
 	if err := s.CompleteDeliveryAttempt(ctx, dropped, DeliveryDropped, base.Add(time.Minute)); err != nil {
 		t.Fatal(err)
 	}
-	if _, err := s.BeginDeliveryAttempt(ctx, "reminder", "", 7, "voice", "h3", base.Add(2*time.Minute)); err != nil {
+	if _, err := s.BeginDeliveryAttempt(ctx, "reminder", "", 7, "reminder:test", "voice", "h3", base.Add(2*time.Minute)); err != nil {
 		t.Fatal(err)
 	}
 
diff --git a/internal/store/migrations.go b/internal/store/migrations.go
index 3381064..7862e98 100644
--- a/internal/store/migrations.go
+++ b/internal/store/migrations.go
@@ -351,6 +351,29 @@ ALTER TABLE reminders ADD COLUMN next_fire_ts INTEGER;`, // #2
 		source     TEXT    NOT NULL DEFAULT '',
 		encoder_id TEXT    NOT NULL DEFAULT ''
 	);`,
+	// #25 — durable reminder delivery state (V-651). A reminder can remain
+	// pending for a long time when every reachable transport is unhealthy. The
+	// phrased text belongs to that delivery occurrence, so retaining it here
+	// avoids spending the resident model again on every retry and across daemon
+	// restarts. next_attempt_ts makes transport failures wait on a bounded
+	// exponential backoff instead of retrying at the tick rate. delivery_group
+	// keeps the originals of a collapsed catch-up bundle together; a reminder
+	// that becomes due later must not make the old bundle get re-phrased.
+	`ALTER TABLE reminders ADD COLUMN delivery_group TEXT NOT NULL DEFAULT '';
+	 ALTER TABLE reminders ADD COLUMN phrase_body TEXT NOT NULL DEFAULT '';
+	 ALTER TABLE reminders ADD COLUMN phrase_summary TEXT NOT NULL DEFAULT '';
+	 ALTER TABLE reminders ADD COLUMN phrase_mood TEXT NOT NULL DEFAULT '';
+	 ALTER TABLE reminders ADD COLUMN delivery_attempts INTEGER NOT NULL DEFAULT 0 CHECK (delivery_attempts >= 0);
+	 ALTER TABLE reminders ADD COLUMN next_attempt_ts INTEGER;
+	 ALTER TABLE delivery_attempts ADD COLUMN delivery_group TEXT NOT NULL DEFAULT '';
+	 ALTER TABLE reminders ADD COLUMN delivery_blocked_ts INTEGER;
+	 ALTER TABLE reminders ADD COLUMN delivery_blocked_error TEXT NOT NULL DEFAULT '';
+	 CREATE INDEX IF NOT EXISTS idx_reminders_due
+	   ON reminders (next_fire_ts, next_attempt_ts)
+	   WHERE status = 'pending';
+	 CREATE INDEX IF NOT EXISTS idx_delivery_attempts_reminder_group
+	   ON delivery_attempts (delivery_group, status)
+	   WHERE kind = 'reminder' AND delivery_group <> '';`,
 }
 
 // migrate applies every migration with a number greater than the DB's current
diff --git a/internal/store/reminders.go b/internal/store/reminders.go
index f7b67df..46705f7 100644
--- a/internal/store/reminders.go
+++ b/internal/store/reminders.go
@@ -22,6 +22,20 @@ type Reminder struct {
 	Status     string    // pending | fired | cancelled
 	Cron       string    // cron expression, empty for one-shot
 
+	// DeliveryGroup and Phrase* are the durable presentation for this exact
+	// occurrence. A collapsed catch-up bundle stores the same group and phrase
+	// on every original reminder, so a retry (including after restart) says the
+	// same thing without asking the model again. Rescheduling a recurring
+	// reminder clears them for its next occurrence.
+	DeliveryGroup        string
+	PhraseBody           string
+	PhraseSummary        string
+	PhraseMood           string
+	DeliveryAttempts     int
+	NextAttemptTs        time.Time
+	DeliveryBlockedTs    time.Time
+	DeliveryBlockedError string
+
 	// Collapsed — set only on a synthetic digest reminder (ID=0): the original
 	// due reminders it stands in for. Not persisted. The dispatcher completes
 	// (marks fired / reschedules) each of these after the digest delivers.
@@ -62,18 +76,35 @@ const (
 	ReminderPending   = "pending"
 	ReminderFired     = "fired"
 	ReminderCancelled = "cancelled"
+
+	// ReminderRetryBase and ReminderRetryMax bound the retry cadence. Attempts
+	// continue indefinitely because a reminder must not disappear during a
+	// long transport outage; only the delay stops growing.
+	ReminderRetryBase = time.Minute
+	ReminderRetryMax  = time.Hour
 )
 
 var (
 	ErrReminderNotFound = errors.New("store: reminder not found")
 	ErrReminderState    = errors.New("store: reminder not in a mutable state")
+	ErrReminderPhrase   = errors.New("store: reminder delivery phrase invalid")
 )
 
+const reminderColumns = `id, created_ts, fire_ts, next_fire_ts, payload, status, cron,
+	 delivery_group, phrase_body, phrase_summary, phrase_mood, delivery_attempts, next_attempt_ts,
+	 delivery_blocked_ts, delivery_blocked_error`
+
 func scanReminder(sc scanner) (Reminder, error) {
 	var r Reminder
 	var created, fire, nextFire int64
 	var cron *string
-	if err := sc.Scan(&r.ID, &created, &fire, &nextFire, &r.Payload, &r.Status, &cron); err != nil {
+	var nextAttempt *int64
+	var blocked *int64
+	if err := sc.Scan(
+		&r.ID, &created, &fire, &nextFire, &r.Payload, &r.Status, &cron,
+		&r.DeliveryGroup, &r.PhraseBody, &r.PhraseSummary, &r.PhraseMood,
+		&r.DeliveryAttempts, &nextAttempt, &blocked, &r.DeliveryBlockedError,
+	); err != nil {
 		return Reminder{}, err
 	}
 	r.CreatedTs = time.UnixMilli(created).UTC()
@@ -82,6 +113,12 @@ func scanReminder(sc scanner) (Reminder, error) {
 	if cron != nil {
 		r.Cron = *cron
 	}
+	if nextAttempt != nil {
+		r.NextAttemptTs = time.UnixMilli(*nextAttempt).UTC()
+	}
+	if blocked != nil {
+		r.DeliveryBlockedTs = time.UnixMilli(*blocked).UTC()
+	}
 	return r, nil
 }
 
@@ -111,11 +148,20 @@ func (s *Store) CreateReminder(ctx context.Context, fire time.Time, payload, cro
 // DueReminders returns pending reminders with next_fire_ts <= now, oldest first.
 // This is the predicate input from the loop side: `next_fire_ts <= now AND status='pending'`.
 func (s *Store) DueReminders(ctx context.Context, now time.Time) ([]Reminder, error) {
-	rows, err := s.db.QueryContext(ctx, `
-		SELECT id, created_ts, fire_ts, next_fire_ts, payload, status, cron
+	rows, err := s.db.QueryContext(ctx, `SELECT `+reminderColumns+`
 		  FROM reminders
 		 WHERE status = 'pending' AND next_fire_ts <= ?
-		 ORDER BY next_fire_ts ASC`, now.UnixMilli())
+		   AND (next_attempt_ts IS NULL OR next_attempt_ts <= ?)
+		   AND delivery_blocked_ts IS NULL
+		   AND NOT EXISTS (
+		       SELECT 1
+		         FROM delivery_attempts AS attempt
+		        WHERE attempt.kind = 'reminder'
+		          AND attempt.delivery_group = reminders.delivery_group
+		          AND reminders.delivery_group <> ''
+		          AND attempt.status IN ('pending', 'sent', 'unknown')
+		   )
+		 ORDER BY next_fire_ts ASC, id ASC`, now.UnixMilli(), now.UnixMilli())
 	if err != nil {
 		return nil, fmt.Errorf("due reminders: %w", err)
 	}
@@ -140,8 +186,7 @@ func (s *Store) DueReminders(ctx context.Context, now time.Time) ([]Reminder, er
 // for next year stayed on it. Bounding by fire time drops what is out of range
 // instead of what is old.
 func (s *Store) PendingReminders(ctx context.Context, from, to time.Time) ([]Reminder, error) {
-	rows, err := s.db.QueryContext(ctx, `
-		SELECT id, created_ts, fire_ts, next_fire_ts, payload, status, cron
+	rows, err := s.db.QueryContext(ctx, `SELECT `+reminderColumns+`
 		  FROM reminders
 		 WHERE status = ? AND next_fire_ts >= ? AND next_fire_ts < ?
 		 ORDER BY next_fire_ts ASC, id ASC`,
@@ -164,29 +209,42 @@ func (s *Store) PendingReminders(ctx context.Context, from, to time.Time) ([]Rem
 // MarkReminder sets a reminder's status. Only valid transitions: pending→fired,
 // pending→cancelled. Anything else is a programming error.
 func (s *Store) MarkReminder(ctx context.Context, id int64, status string) error {
-	if status != "fired" && status != "cancelled" {
+	if status != ReminderFired && status != ReminderCancelled {
 		return fmt.Errorf("%w: %s", ErrReminderState, status)
 	}
-	// pending → fired|cancelled only.
+	// The old read-then-write transition allowed two callers to both observe
+	// pending and both report success. Keeping the source state in the UPDATE
+	// predicate makes pending → fired|cancelled one atomic contest (V-678).
+	res, err := s.db.ExecContext(ctx,
+		"UPDATE reminders SET status = ? WHERE id = ? AND status = ?",
+		status, id, ReminderPending)
+	if err != nil {
+		return err
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("mark reminder: rows affected: %w", err)
+	}
+	if n == 1 {
+		return nil
+	}
+
+	// Preserve the public distinction between a missing id and a completed
+	// state without weakening the atomic transition above.
 	var current string
-	err := s.db.QueryRowContext(ctx, "SELECT status FROM reminders WHERE id = ?", id).Scan(&current)
+	err = s.db.QueryRowContext(ctx, "SELECT status FROM reminders WHERE id = ?", id).Scan(&current)
 	if errors.Is(err, sql.ErrNoRows) {
 		return ErrReminderNotFound
 	}
 	if err != nil {
 		return err
 	}
-	if current != "pending" {
-		return fmt.Errorf("%w: currently %s", ErrReminderState, current)
-	}
-	_, err = s.db.ExecContext(ctx, "UPDATE reminders SET status = ? WHERE id = ?", status, id)
-	return err
+	return fmt.Errorf("%w: currently %s", ErrReminderState, current)
 }
 
 // ListReminders returns the n most recent reminders, newest first.
 func (s *Store) ListReminders(ctx context.Context, n int) ([]Reminder, error) {
-	rows, err := s.db.QueryContext(ctx, `
-		SELECT id, created_ts, fire_ts, next_fire_ts, payload, status, cron
+	rows, err := s.db.QueryContext(ctx, `SELECT `+reminderColumns+`
 		  FROM reminders ORDER BY created_ts DESC, id DESC LIMIT ?`, n)
 	if err != nil {
 		return nil, fmt.Errorf("list reminders: %w", err)
@@ -203,6 +261,352 @@ func (s *Store) ListReminders(ctx context.Context, n int) ([]Reminder, error) {
 	return out, rows.Err()
 }
 
+// HasDeliveryPhrase reports whether this occurrence already has a durable
+// presentation. Summary may intentionally be empty (the delivery boundary has
+// a generic privacy-preserving fallback), so Body is the readiness marker.
+func (r Reminder) HasDeliveryPhrase() bool {
+	return r.DeliveryGroup != "" && r.PhraseBody != ""
+}
+
+// ReminderRetryDelay returns the delay after attempt (one-based). It grows
+// exponentially from one minute and stays at one hour; retries do not stop.
+func ReminderRetryDelay(attempt int) time.Duration {
+	if attempt <= 1 {
+		return ReminderRetryBase
+	}
+	delay := ReminderRetryBase
+	for i := 1; i < attempt && delay < ReminderRetryMax; i++ {
+		if delay >= ReminderRetryMax/2 {
+			return ReminderRetryMax
+		}
+		delay *= 2
+	}
+	if delay > ReminderRetryMax {
+		return ReminderRetryMax
+	}
+	return delay
+}
+
+// CacheReminderPhrase stores one presentation on every original represented
+// by a reminder delivery. For a collapsed bundle, originals contains every
+// row in Reminder.Collapsed and group is shared across all of them.
+//
+// The occurrence timestamp and empty-body predicates keep this from attaching
+// an old phrase to a recurring reminder's next occurrence or overwriting a
+// phrase another delivery already claimed. The transaction prevents a partial
+// bundle cache: after a crash either every original can reconstruct the bundle
+// or none can.
+func (s *Store) CacheReminderPhrase(
+	ctx context.Context,
+	originals []Reminder,
+	group, body, summary, mood string,
+) error {
+	if len(originals) == 0 || group == "" || body == "" {
+		return ErrReminderPhrase
+	}
+	if mood == "" {
+		mood = "neutral"
+	}
+	tx, err := s.db.BeginTx(ctx, nil)
+	if err != nil {
+		return fmt.Errorf("cache reminder phrase: begin: %w", err)
+	}
+	defer tx.Rollback()
+
+	seen := make(map[int64]struct{}, len(originals))
+	for _, r := range originals {
+		if r.ID <= 0 || r.NextFireTs.IsZero() {
+			return ErrReminderPhrase
+		}
+		if _, ok := seen[r.ID]; ok {
+			return ErrReminderPhrase
+		}
+		seen[r.ID] = struct{}{}
+		res, err := tx.ExecContext(ctx, `
+			UPDATE reminders
+			   SET delivery_group = ?, phrase_body = ?, phrase_summary = ?, phrase_mood = ?
+			 WHERE id = ? AND status = ? AND next_fire_ts = ? AND phrase_body = ''`,
+			group, body, summary, mood, r.ID, ReminderPending, r.NextFireTs.UnixMilli())
+		if err != nil {
+			return fmt.Errorf("cache reminder phrase %d: %w", r.ID, err)
+		}
+		n, err := res.RowsAffected()
+		if err != nil {
+			return fmt.Errorf("cache reminder phrase %d: rows affected: %w", r.ID, err)
+		}
+		if n != 1 {
+			return fmt.Errorf("%w: reminder %d is no longer an unphrased pending occurrence", ErrReminderState, r.ID)
+		}
+	}
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("cache reminder phrase: commit: %w", err)
+	}
+	return nil
+}
+
+// ScheduleReminderRetry moves every still-pending original into a retry wait.
+// Terminal rows are skipped: cancellation winning while a send was in flight
+// must not be resurrected. A recurring row whose occurrence changed is skipped
+// for the same reason. All remaining originals get their own persisted attempt
+// count; normally a collapsed bundle keeps those counts in lockstep.
+func (s *Store) ScheduleReminderRetry(ctx context.Context, originals []Reminder, now time.Time) error {
+	if len(originals) == 0 {
+		return ErrReminderNotFound
+	}
+	tx, err := s.db.BeginTx(ctx, nil)
+	if err != nil {
+		return fmt.Errorf("schedule reminder retry: begin: %w", err)
+	}
+	defer tx.Rollback()
+
+	seen := make(map[int64]struct{}, len(originals))
+	for _, expected := range originals {
+		if expected.ID <= 0 || expected.NextFireTs.IsZero() {
+			return ErrReminderNotFound
+		}
+		if _, ok := seen[expected.ID]; ok {
+			continue
+		}
+		seen[expected.ID] = struct{}{}
+
+		var status string
+		var nextFire int64
+		var attempts int
+		var blocked *int64
+		err := tx.QueryRowContext(ctx,
+			`SELECT status, next_fire_ts, delivery_attempts, delivery_blocked_ts FROM reminders WHERE id = ?`,
+			expected.ID).Scan(&status, &nextFire, &attempts, &blocked)
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrReminderNotFound
+		}
+		if err != nil {
+			return fmt.Errorf("schedule reminder retry %d: read: %w", expected.ID, err)
+		}
+		if status != ReminderPending || nextFire != expected.NextFireTs.UnixMilli() || blocked != nil {
+			continue
+		}
+		if expected.DeliveryGroup != "" {
+			var ambiguous int
+			if err := tx.QueryRowContext(ctx, `
+				SELECT EXISTS (
+					SELECT 1 FROM delivery_attempts
+					 WHERE kind = 'reminder' AND delivery_group = ?
+					   AND status IN ('pending', 'sent', 'unknown')
+				)`, expected.DeliveryGroup).Scan(&ambiguous); err != nil {
+				return fmt.Errorf("schedule reminder retry %d: inspect outbox: %w", expected.ID, err)
+			}
+			if ambiguous != 0 {
+				// The sink may have accepted this presentation. Leave the reminder
+				// pending but ineligible for automatic retry; operator resolution
+				// must not be replaced with a guessed duplicate.
+				continue
+			}
+		}
+
+		attempts++
+		nextAttempt := now.Add(ReminderRetryDelay(attempts)).UnixMilli()
+		res, err := tx.ExecContext(ctx, `
+			UPDATE reminders
+			   SET delivery_attempts = ?, next_attempt_ts = ?
+			 WHERE id = ? AND status = ? AND next_fire_ts = ? AND delivery_attempts = ?`,
+			attempts, nextAttempt, expected.ID, ReminderPending, nextFire, attempts-1)
+		if err != nil {
+			return fmt.Errorf("schedule reminder retry %d: %w", expected.ID, err)
+		}
+		n, err := res.RowsAffected()
+		if err != nil {
+			return fmt.Errorf("schedule reminder retry %d: rows affected: %w", expected.ID, err)
+		}
+		if n != 1 {
+			return fmt.Errorf("%w: reminder %d changed concurrently", ErrReminderState, expected.ID)
+		}
+	}
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("schedule reminder retry: commit: %w", err)
+	}
+	return nil
+}
+
+// BlockReminderDelivery records a permanent transport/configuration refusal on
+// every original represented by one presentation. Blocked rows stay pending and
+// visible, but never retry automatically. UnblockReminderDelivery is the
+// deliberate recovery path after credentials or policy are repaired.
+func (s *Store) BlockReminderDelivery(ctx context.Context, originals []Reminder, now time.Time, reason string) error {
+	if len(originals) == 0 || strings.TrimSpace(reason) == "" {
+		return ErrReminderState
+	}
+	tx, err := s.db.BeginTx(ctx, nil)
+	if err != nil {
+		return fmt.Errorf("block reminder delivery: begin: %w", err)
+	}
+	defer tx.Rollback()
+	seen := make(map[int64]struct{}, len(originals))
+	for _, expected := range originals {
+		if expected.ID <= 0 || expected.NextFireTs.IsZero() {
+			return ErrReminderNotFound
+		}
+		if _, ok := seen[expected.ID]; ok {
+			continue
+		}
+		seen[expected.ID] = struct{}{}
+		res, err := tx.ExecContext(ctx, `
+			UPDATE reminders
+			   SET delivery_blocked_ts = ?, delivery_blocked_error = ?, next_attempt_ts = NULL
+			 WHERE id = ? AND status = ? AND next_fire_ts = ?`,
+			now.UnixMilli(), reason, expected.ID, ReminderPending, expected.NextFireTs.UnixMilli())
+		if err != nil {
+			return fmt.Errorf("block reminder %d: %w", expected.ID, err)
+		}
+		if err := requireOneReminderRow(res, expected.ID); err != nil {
+			return err
+		}
+	}
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("block reminder delivery: commit: %w", err)
+	}
+	return nil
+}
+
+func (s *Store) UnblockReminderDelivery(ctx context.Context, id int64) error {
+	res, err := s.db.ExecContext(ctx, `
+		UPDATE reminders
+		   SET delivery_blocked_ts = NULL, delivery_blocked_error = '', next_attempt_ts = NULL
+		 WHERE id = ? AND status = ? AND delivery_blocked_ts IS NOT NULL`, id, ReminderPending)
+	if err != nil {
+		return fmt.Errorf("unblock reminder %d: %w", id, err)
+	}
+	return requireOneReminderRow(res, id)
+}
+
+// CompleteReminderDelivery applies the bookkeeping for every original covered
+// by one successful external send in a single transaction. One-shot reminders
+// become fired; recurring reminders advance to their next occurrence and shed
+// the old presentation/retry state. The all-or-nothing boundary prevents a
+// collapsed digest from becoming half-fired and then being repeated.
+func (s *Store) CompleteReminderDelivery(ctx context.Context, originals []Reminder, now time.Time) error {
+	return s.completeReminderDeliveryIn(ctx, 0, originals, now, time.Local)
+}
+
+// CompleteSuccessfulReminderAttempt atomically closes a definitely successful
+// external attempt and advances every reminder occurrence it represented. If
+// this transaction cannot commit, the attempt remains pending; startup then
+// reconciles it to unknown, and the occurrence is held from automatic replay.
+func (s *Store) CompleteSuccessfulReminderAttempt(ctx context.Context, attemptID int64, originals []Reminder, now time.Time) error {
+	if attemptID <= 0 {
+		return fmt.Errorf("complete reminder delivery: invalid attempt id %d", attemptID)
+	}
+	return s.completeReminderDeliveryIn(ctx, attemptID, originals, now, time.Local)
+}
+
+func (s *Store) completeReminderDeliveryIn(ctx context.Context, attemptID int64, originals []Reminder, now time.Time, loc *time.Location) error {
+	if len(originals) == 0 {
+		return ErrReminderNotFound
+	}
+	tx, err := s.db.BeginTx(ctx, nil)
+	if err != nil {
+		return fmt.Errorf("complete reminder delivery: begin: %w", err)
+	}
+	defer tx.Rollback()
+	if attemptID != 0 {
+		res, err := tx.ExecContext(ctx,
+			`UPDATE delivery_attempts SET status = ?, completed_ts = ? WHERE id = ? AND status = ?`,
+			DeliverySent, now.UnixMilli(), attemptID, DeliveryPending)
+		if err != nil {
+			return fmt.Errorf("complete reminder delivery attempt %d: %w", attemptID, err)
+		}
+		n, err := res.RowsAffected()
+		if err != nil {
+			return fmt.Errorf("complete reminder delivery attempt %d: rows affected: %w", attemptID, err)
+		}
+		if n != 1 {
+			return fmt.Errorf("complete reminder delivery attempt %d: not pending", attemptID)
+		}
+	}
+
+	seen := make(map[int64]struct{}, len(originals))
+	for _, expected := range originals {
+		if expected.ID <= 0 || expected.NextFireTs.IsZero() {
+			return ErrReminderNotFound
+		}
+		if _, ok := seen[expected.ID]; ok {
+			return fmt.Errorf("%w: duplicate reminder %d in one delivery", ErrReminderState, expected.ID)
+		}
+		seen[expected.ID] = struct{}{}
+
+		row := tx.QueryRowContext(ctx, `SELECT `+reminderColumns+` FROM reminders WHERE id = ?`, expected.ID)
+		current, err := scanReminder(row)
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrReminderNotFound
+		}
+		if err != nil {
+			return fmt.Errorf("complete reminder %d: read: %w", expected.ID, err)
+		}
+		if current.Status != ReminderPending || !current.NextFireTs.Equal(expected.NextFireTs) {
+			return fmt.Errorf("%w: reminder %d occurrence changed", ErrReminderState, expected.ID)
+		}
+		if expected.DeliveryGroup != "" && current.DeliveryGroup != expected.DeliveryGroup {
+			return fmt.Errorf("%w: reminder %d delivery group changed", ErrReminderState, expected.ID)
+		}
+
+		if current.Cron == "" {
+			if err := completeOneShotReminderTx(ctx, tx, current); err != nil {
+				return err
+			}
+			continue
+		}
+		next, err := nextReminderOccurrence(current, now, loc)
+		if err != nil {
+			return err
+		}
+		if next.IsZero() {
+			if err := completeOneShotReminderTx(ctx, tx, current); err != nil {
+				return err
+			}
+			continue
+		}
+		res, err := tx.ExecContext(ctx, `
+			UPDATE reminders
+			   SET next_fire_ts = ?, delivery_group = '', phrase_body = '',
+			       phrase_summary = '', phrase_mood = '', delivery_attempts = 0,
+			       next_attempt_ts = NULL, delivery_blocked_ts = NULL,
+			       delivery_blocked_error = ''
+			 WHERE id = ? AND status = ? AND next_fire_ts = ?`,
+			next.UnixMilli(), current.ID, ReminderPending, current.NextFireTs.UnixMilli())
+		if err != nil {
+			return fmt.Errorf("complete recurring reminder %d: %w", current.ID, err)
+		}
+		if err := requireOneReminderRow(res, current.ID); err != nil {
+			return err
+		}
+	}
+
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("complete reminder delivery: commit: %w", err)
+	}
+	return nil
+}
+
+func completeOneShotReminderTx(ctx context.Context, tx *sql.Tx, r Reminder) error {
+	res, err := tx.ExecContext(ctx,
+		`UPDATE reminders SET status = ? WHERE id = ? AND status = ? AND next_fire_ts = ?`,
+		ReminderFired, r.ID, ReminderPending, r.NextFireTs.UnixMilli())
+	if err != nil {
+		return fmt.Errorf("complete reminder %d: %w", r.ID, err)
+	}
+	return requireOneReminderRow(res, r.ID)
+}
+
+func requireOneReminderRow(res sql.Result, id int64) error {
+	n, err := res.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("complete reminder %d: rows affected: %w", id, err)
+	}
+	if n != 1 {
+		return fmt.Errorf("%w: reminder %d changed concurrently", ErrReminderState, id)
+	}
+	return nil
+}
+
 // RescheduleReminder computes the next fire time for a recurring reminder and
 // updates next_fire_ts. Returns ErrReminderState if the reminder is not
 // recurring or not pending. If the schedule yields no further fire time at all,
@@ -229,8 +633,7 @@ func (s *Store) RescheduleReminder(ctx context.Context, id int64, now time.Time)
 }
 
 func (s *Store) rescheduleReminderIn(ctx context.Context, id int64, now time.Time, loc *time.Location) error {
-	row := s.db.QueryRowContext(ctx, `
-		SELECT id, created_ts, fire_ts, next_fire_ts, payload, status, cron
+	row := s.db.QueryRowContext(ctx, `SELECT `+reminderColumns+`
 		  FROM reminders WHERE id = ?`, id)
 	r, err := scanReminder(row)
 	if err != nil {
@@ -243,9 +646,38 @@ func (s *Store) rescheduleReminderIn(ctx context.Context, id int64, now time.Tim
 		return fmt.Errorf("%w: currently %s", ErrReminderState, r.Status)
 	}
 
+	next, err := nextReminderOccurrence(r, now, loc)
+	if err != nil {
+		return err
+	}
+	if next.IsZero() {
+		return s.MarkReminder(ctx, id, ReminderFired)
+	}
+	res, err := s.db.ExecContext(ctx, `
+		UPDATE reminders
+		   SET next_fire_ts = ?, delivery_group = '', phrase_body = '',
+		       phrase_summary = '', phrase_mood = '', delivery_attempts = 0,
+		       next_attempt_ts = NULL, delivery_blocked_ts = NULL,
+		       delivery_blocked_error = ''
+		 WHERE id = ? AND status = ? AND next_fire_ts = ?`,
+		next.UnixMilli(), id, ReminderPending, r.NextFireTs.UnixMilli())
+	if err != nil {
+		return err
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		return fmt.Errorf("reschedule reminder: rows affected: %w", err)
+	}
+	if n != 1 {
+		return fmt.Errorf("%w: reminder %d changed concurrently", ErrReminderState, id)
+	}
+	return nil
+}
+
+func nextReminderOccurrence(r Reminder, now time.Time, loc *time.Location) (time.Time, error) {
 	sched, err := cron.ParseStandard(r.Cron)
 	if err != nil {
-		return fmt.Errorf("parse cron %q: %w", r.Cron, err)
+		return time.Time{}, fmt.Errorf("parse cron %q: %w", r.Cron, err)
 	}
 	// Next is strictly after the time it is given, so the last fire cannot be
 	// returned again and no fudge minute is needed. The bound stops a schedule
@@ -255,9 +687,7 @@ func (s *Store) rescheduleReminderIn(ctx context.Context, id int64, now time.Tim
 		next = sched.Next(next)
 	}
 	if next.IsZero() || !next.After(now) {
-		_, err = s.db.ExecContext(ctx, "UPDATE reminders SET status = 'fired' WHERE id = ?", id)
-		return err
+		return time.Time{}, nil
 	}
-	_, err = s.db.ExecContext(ctx, "UPDATE reminders SET next_fire_ts = ? WHERE id = ?", next.UnixMilli(), id)
-	return err
+	return next, nil
 }
diff --git a/internal/store/reminders_delivery_test.go b/internal/store/reminders_delivery_test.go
new file mode 100644
index 0000000..02fa400
--- /dev/null
+++ b/internal/store/reminders_delivery_test.go
@@ -0,0 +1,417 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"path/filepath"
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestReminderPhraseAndRetrySurviveRestart(t *testing.T) {
+	ctx := context.Background()
+	path := filepath.Join(t.TempDir(), "reminders.db")
+	now := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+
+	s, err := Open(ctx, path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	id, err := s.CreateReminder(ctx, now.Add(-time.Minute), `{"text":"позвонить маме"}`, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	due, err := s.DueReminders(ctx, now)
+	if err != nil || len(due) != 1 {
+		t.Fatalf("initial due reminders = %d, err=%v", len(due), err)
+	}
+	if err := s.CacheReminderPhrase(ctx, due, "reminder:one", "Позвони маме.", "Позвони маме", "warm"); err != nil {
+		t.Fatalf("cache phrase: %v", err)
+	}
+	if err := s.ScheduleReminderRetry(ctx, due, now); err != nil {
+		t.Fatalf("schedule retry: %v", err)
+	}
+	if err := s.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	s, err = Open(ctx, path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = s.Close() })
+	if got, err := s.DueReminders(ctx, now.Add(30*time.Second)); err != nil || len(got) != 0 {
+		t.Fatalf("during retry wait: got %d due, err=%v", len(got), err)
+	}
+	due, err = s.DueReminders(ctx, now.Add(ReminderRetryBase))
+	if err != nil || len(due) != 1 {
+		t.Fatalf("at retry time: got %d due, err=%v", len(due), err)
+	}
+	r := due[0]
+	if r.ID != id || r.DeliveryGroup != "reminder:one" || r.PhraseBody != "Позвони маме." ||
+		r.PhraseSummary != "Позвони маме" || r.PhraseMood != "warm" {
+		t.Fatalf("persisted delivery presentation = %+v", r)
+	}
+	if r.DeliveryAttempts != 1 {
+		t.Fatalf("attempts = %d, want 1", r.DeliveryAttempts)
+	}
+	if want := now.Add(ReminderRetryBase); !r.NextAttemptTs.Equal(want) {
+		t.Fatalf("next attempt = %s, want %s", r.NextAttemptTs, want)
+	}
+}
+
+func TestReminderRetryDelayIsExponentialAndBounded(t *testing.T) {
+	wants := []time.Duration{
+		time.Minute, 2 * time.Minute, 4 * time.Minute, 8 * time.Minute,
+		16 * time.Minute, 32 * time.Minute, time.Hour, time.Hour, time.Hour,
+	}
+	for i, want := range wants {
+		if got := ReminderRetryDelay(i + 1); got != want {
+			t.Errorf("attempt %d delay = %s, want %s", i+1, got, want)
+		}
+	}
+}
+
+func TestCollapsedReminderRetryStateMovesTogether(t *testing.T) {
+	s := newTestStore(t)
+	ctx := context.Background()
+	now := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+	for _, text := range []string{"полить цветы", "позвонить врачу"} {
+		if _, err := s.CreateReminder(ctx, now.Add(-time.Minute), text, ""); err != nil {
+			t.Fatal(err)
+		}
+	}
+	originals, err := s.DueReminders(ctx, now)
+	if err != nil || len(originals) != 2 {
+		t.Fatalf("due originals = %d, err=%v", len(originals), err)
+	}
+	if err := s.CacheReminderPhrase(ctx, originals, "reminder:bundle", "У тебя два напоминания.", "Два напоминания", "neutral"); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.ScheduleReminderRetry(ctx, originals, now); err != nil {
+		t.Fatal(err)
+	}
+
+	rows, err := s.ListReminders(ctx, 10)
+	if err != nil || len(rows) != 2 {
+		t.Fatalf("list = %d, err=%v", len(rows), err)
+	}
+	for _, r := range rows {
+		if r.DeliveryGroup != "reminder:bundle" || r.PhraseBody != "У тебя два напоминания." || r.DeliveryAttempts != 1 {
+			t.Errorf("bundle original did not move with group: %+v", r)
+		}
+		if !r.NextAttemptTs.Equal(now.Add(time.Minute)) {
+			t.Errorf("next attempt = %s, want %s", r.NextAttemptTs, now.Add(time.Minute))
+		}
+	}
+}
+
+func TestRecurringReminderClearsDeliveryStateForNextOccurrence(t *testing.T) {
+	s := newTestStore(t)
+	ctx := context.Background()
+	loc := time.FixedZone("MSK", 3*60*60)
+	fire := time.Date(2026, 8, 13, 9, 0, 0, 0, loc)
+	id, err := s.CreateReminder(ctx, fire, `{"text":"стендап"}`, "0 9 * * *")
+	if err != nil {
+		t.Fatal(err)
+	}
+	due, err := s.DueReminders(ctx, fire)
+	if err != nil || len(due) != 1 {
+		t.Fatalf("due = %d, err=%v", len(due), err)
+	}
+	if err := s.CacheReminderPhrase(ctx, due, "reminder:occurrence", "Пора на стендап.", "Стендап", "neutral"); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.ScheduleReminderRetry(ctx, due, fire); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.rescheduleReminderIn(ctx, id, fire.Add(time.Minute), loc); err != nil {
+		t.Fatalf("reschedule: %v", err)
+	}
+
+	rows, err := s.ListReminders(ctx, 1)
+	if err != nil || len(rows) != 1 {
+		t.Fatalf("list = %d, err=%v", len(rows), err)
+	}
+	r := rows[0]
+	if r.Status != ReminderPending || r.DeliveryGroup != "" || r.PhraseBody != "" ||
+		r.PhraseSummary != "" || r.PhraseMood != "" || r.DeliveryAttempts != 0 || !r.NextAttemptTs.IsZero() {
+		t.Fatalf("next occurrence retained old delivery state: %+v", r)
+	}
+	want := time.Date(2026, 8, 14, 9, 0, 0, 0, loc)
+	if !r.NextFireTs.Equal(want) {
+		t.Fatalf("next fire = %s, want %s", r.NextFireTs.In(loc), want)
+	}
+}
+
+func TestReminderTerminalTransitionHasExactlyOneWinner(t *testing.T) {
+	s := newTestStore(t)
+	ctx := context.Background()
+	now := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+
+	for iteration := 0; iteration < 40; iteration++ {
+		id, err := s.CreateReminder(ctx, now, "race", "")
+		if err != nil {
+			t.Fatal(err)
+		}
+		start := make(chan struct{})
+		var wg sync.WaitGroup
+		errs := make([]error, 2)
+		statuses := []string{ReminderFired, ReminderCancelled}
+		for i := range statuses {
+			wg.Add(1)
+			go func(i int) {
+				defer wg.Done()
+				<-start
+				errs[i] = s.MarkReminder(ctx, id, statuses[i])
+			}(i)
+		}
+		close(start)
+		wg.Wait()
+
+		successes := 0
+		losers := 0
+		winner := ""
+		for i, err := range errs {
+			switch {
+			case err == nil:
+				successes++
+				winner = statuses[i]
+			case errors.Is(err, ErrReminderState):
+				losers++
+			default:
+				t.Fatalf("iteration %d transition %s: %v", iteration, statuses[i], err)
+			}
+		}
+		if successes != 1 || losers != 1 {
+			t.Fatalf("iteration %d: successes=%d losers=%d errors=%v", iteration, successes, losers, errs)
+		}
+		var stored string
+		if err := s.db.QueryRowContext(ctx, `SELECT status FROM reminders WHERE id = ?`, id).Scan(&stored); err != nil {
+			t.Fatal(err)
+		}
+		if stored != winner {
+			t.Fatalf("iteration %d: stored %q, successful transition %q", iteration, stored, winner)
+		}
+	}
+}
+
+func TestAmbiguousCollapsedDeliveryIsNotAutomaticallyRepeated(t *testing.T) {
+	s := newTestStore(t)
+	ctx := context.Background()
+	now := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+	for _, text := range []string{"полить цветы", "позвонить врачу"} {
+		if _, err := s.CreateReminder(ctx, now.Add(-time.Minute), text, ""); err != nil {
+			t.Fatal(err)
+		}
+	}
+	originals, err := s.DueReminders(ctx, now)
+	if err != nil || len(originals) != 2 {
+		t.Fatalf("due originals = %d, err=%v", len(originals), err)
+	}
+	const group = "reminder:ambiguous-bundle"
+	if err := s.CacheReminderPhrase(ctx, originals, group, "У тебя два напоминания.", "Два напоминания", "neutral"); err != nil {
+		t.Fatal(err)
+	}
+	for i := range originals {
+		originals[i].DeliveryGroup = group
+	}
+
+	// Simulate a process dying after Begin and before it can record whether the
+	// external sink accepted the bundle. Synthetic reminder zero is never put
+	// in the outbox: a real original is the human-readable representative and
+	// the group is the occurrence identity shared by both originals.
+	attemptID, err := s.BeginDeliveryAttempt(ctx, "reminder", "", originals[0].ID, group, "telegram", "hash", now)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.ReconcileStaleDeliveryAttempts(ctx, now.Add(time.Minute)); err != nil {
+		t.Fatal(err)
+	}
+	if due, err := s.DueReminders(ctx, now.Add(24*time.Hour)); err != nil || len(due) != 0 {
+		t.Fatalf("ambiguous delivered bundle was eligible for automatic repeat: due=%+v err=%v", due, err)
+	}
+	attempts, err := s.ListDeliveryAttempts(ctx, "", 10)
+	if err != nil || len(attempts) != 1 {
+		t.Fatalf("attempts=%+v err=%v", attempts, err)
+	}
+	if attempts[0].ID != attemptID || attempts[0].Status != DeliveryUnknown || attempts[0].DeliveryGroup != group {
+		t.Fatalf("ambiguous occurrence lost its durable identity: %+v", attempts[0])
+	}
+	if err := s.ScheduleReminderRetry(ctx, originals, now.Add(time.Minute)); err != nil {
+		t.Fatal(err)
+	}
+	rows, err := s.ListReminders(ctx, 10)
+	if err != nil || len(rows) != 2 {
+		t.Fatalf("rows=%+v err=%v", rows, err)
+	}
+	for _, r := range rows {
+		if r.DeliveryAttempts != 0 || !r.NextAttemptTs.IsZero() {
+			t.Fatalf("ambiguous occurrence was scheduled for automatic retry: %+v", r)
+		}
+	}
+}
+
+func TestDefiniteFailedDeliveryRemainsRetryEligible(t *testing.T) {
+	s := newTestStore(t)
+	ctx := context.Background()
+	now := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+	if _, err := s.CreateReminder(ctx, now.Add(-time.Minute), "позвонить врачу", ""); err != nil {
+		t.Fatal(err)
+	}
+	originals, err := s.DueReminders(ctx, now)
+	if err != nil || len(originals) != 1 {
+		t.Fatalf("due originals = %d, err=%v", len(originals), err)
+	}
+	const group = "reminder:definite-failure"
+	if err := s.CacheReminderPhrase(ctx, originals, group, "Позвони врачу.", "Позвони врачу", "neutral"); err != nil {
+		t.Fatal(err)
+	}
+	id, err := s.BeginDeliveryAttempt(ctx, "reminder", "", originals[0].ID, group, "telegram", "hash", now)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := s.CompleteDeliveryAttempt(ctx, id, DeliveryFailed, now); err != nil {
+		t.Fatal(err)
+	}
+	if due, err := s.DueReminders(ctx, now); err != nil || len(due) != 1 {
+		t.Fatalf("definite failure was not retry eligible: due=%+v err=%v", due, err)
+	}
+}
+
+func TestCollapsedCompletionRollsBackAsOneTransaction(t *testing.T) {
+	s := newTestStore(t)
+	ctx := context.Background()
+	now := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+	for _, text := range []string{"first", "fail-second"} {
+		if _, err := s.CreateReminder(ctx, now.Add(-time.Minute), text, ""); err != nil {
+			t.Fatal(err)
+		}
+	}
+	originals, err := s.DueReminders(ctx, now)
+	if err != nil || len(originals) != 2 {
+		t.Fatalf("due originals = %d, err=%v", len(originals), err)
+	}
+	if _, err := s.db.ExecContext(ctx, `
+		CREATE TRIGGER fail_second_reminder_completion
+		BEFORE UPDATE OF status ON reminders
+		WHEN OLD.payload = 'fail-second'
+		BEGIN
+			SELECT RAISE(ABORT, 'injected second completion failure');
+		END`); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.CompleteReminderDelivery(ctx, originals, now); err == nil {
+		t.Fatal("injected second-row failure did not fail the bundle completion")
+	}
+	rows, err := s.ListReminders(ctx, 10)
+	if err != nil || len(rows) != 2 {
+		t.Fatalf("rows=%+v err=%v", rows, err)
+	}
+	for _, r := range rows {
+		if r.Status != ReminderPending {
+			t.Fatalf("bundle completion partially committed reminder %d as %q", r.ID, r.Status)
+		}
+	}
+}
+
+func TestSuccessfulAttemptAndCollapsedCompletionCommitAtomically(t *testing.T) {
+	s := newTestStore(t)
+	ctx := context.Background()
+	now := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+	for _, text := range []string{"first", "fail-second"} {
+		if _, err := s.CreateReminder(ctx, now.Add(-time.Minute), text, ""); err != nil {
+			t.Fatal(err)
+		}
+	}
+	originals, err := s.DueReminders(ctx, now)
+	if err != nil || len(originals) != 2 {
+		t.Fatalf("due originals = %d, err=%v", len(originals), err)
+	}
+	const group = "reminder:atomic-success"
+	if err := s.CacheReminderPhrase(ctx, originals, group, "Two reminders.", "Two reminders", "neutral"); err != nil {
+		t.Fatal(err)
+	}
+	for i := range originals {
+		originals[i].DeliveryGroup = group
+	}
+	attemptID, err := s.BeginDeliveryAttempt(ctx, "reminder", "", originals[0].ID, group, "telegram", "hash", now)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.db.ExecContext(ctx, `
+		CREATE TRIGGER fail_atomic_second_completion
+		BEFORE UPDATE OF status ON reminders
+		WHEN OLD.payload = 'fail-second'
+		BEGIN
+			SELECT RAISE(ABORT, 'injected second completion failure');
+		END`); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.CompleteSuccessfulReminderAttempt(ctx, attemptID, originals, now); err == nil {
+		t.Fatal("injected reminder completion failure did not fail the local commit")
+	}
+	attempts, err := s.ListDeliveryAttempts(ctx, "", 10)
+	if err != nil || len(attempts) != 1 || attempts[0].Status != DeliveryPending {
+		t.Fatalf("successful outbox marker committed without reminder state: attempts=%+v err=%v", attempts, err)
+	}
+	rows, err := s.ListReminders(ctx, 10)
+	if err != nil || len(rows) != 2 {
+		t.Fatalf("rows=%+v err=%v", rows, err)
+	}
+	for _, r := range rows {
+		if r.Status != ReminderPending {
+			t.Fatalf("atomic rollback partially completed reminder %d as %q", r.ID, r.Status)
+		}
+	}
+	if _, err := s.ReconcileStaleDeliveryAttempts(ctx, now.Add(time.Minute)); err != nil {
+		t.Fatal(err)
+	}
+	if due, err := s.DueReminders(ctx, now.Add(24*time.Hour)); err != nil || len(due) != 0 {
+		t.Fatalf("restart auto-replayed ambiguous accepted send: due=%+v err=%v", due, err)
+	}
+}
+
+func TestPermanentReminderFailureBlocksUntilDeliberatelyUnblocked(t *testing.T) {
+	s := newTestStore(t)
+	ctx := context.Background()
+	now := time.Date(2026, 8, 13, 8, 0, 0, 0, time.UTC)
+	id, err := s.CreateReminder(ctx, now.Add(-time.Minute), "позвонить врачу", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	originals, err := s.DueReminders(ctx, now)
+	if err != nil || len(originals) != 1 {
+		t.Fatalf("due originals=%+v err=%v", originals, err)
+	}
+	const group = "reminder:revoked-token"
+	if err := s.CacheReminderPhrase(ctx, originals, group, "Позвони врачу.", "Позвони врачу", "neutral"); err != nil {
+		t.Fatal(err)
+	}
+	originals[0].DeliveryGroup = group
+	if err := s.BlockReminderDelivery(ctx, originals, now, "ntfy credentials rejected"); err != nil {
+		t.Fatal(err)
+	}
+	if err := s.ScheduleReminderRetry(ctx, originals, now); err != nil {
+		t.Fatal(err)
+	}
+	if due, err := s.DueReminders(ctx, now.Add(24*time.Hour)); err != nil || len(due) != 0 {
+		t.Fatalf("blocked reminder retried automatically: due=%+v err=%v", due, err)
+	}
+	rows, err := s.ListReminders(ctx, 1)
+	if err != nil || len(rows) != 1 {
+		t.Fatalf("rows=%+v err=%v", rows, err)
+	}
+	if rows[0].DeliveryBlockedTs.IsZero() || rows[0].DeliveryBlockedError != "ntfy credentials rejected" ||
+		rows[0].DeliveryAttempts != 0 || !rows[0].NextAttemptTs.IsZero() {
+		t.Fatalf("blocked state is not visible/durable: %+v", rows[0])
+	}
+	if err := s.UnblockReminderDelivery(ctx, id); err != nil {
+		t.Fatal(err)
+	}
+	due, err := s.DueReminders(ctx, now)
+	if err != nil || len(due) != 1 || due[0].ID != id || !due[0].DeliveryBlockedTs.IsZero() || due[0].DeliveryBlockedError != "" {
+		t.Fatalf("deliberate unblock did not restore eligibility: due=%+v err=%v", due, err)
+	}
+}