merge: integrate feat/backlog-burndown into master

master had advanced 16 commits past feat/backlog-burndown's base, and the two
branches independently built four of the same features. Resolved 26 conflicts.

Overlap features — kept master's implementation (more complete / production-wired /
more robust), dropped the feature branch's parallel constellation:
- llama-server health probe: kept master's event-store-backed tps probe; dropped the
  branch's LlamaLivenessClient (liveness-only, throughput unwired).
- event-store probe: kept master's EventStoreHealthProbe; dropped EventStoreLatencyProbe.
- brief echo-back gate: kept master's BriefEchoDiff (Jaccard, tolerates rewording);
  dropped the branch's exact-set-diff BriefEchoComparator/Extractor.
- static-first reviewer: kept master's command/exit-code gate (ProcessStaticAnalysisRunner,
  wired); dropped the branch's structured-finding static_check stage (no-op seam).
  Its structured-findings model is filed as a follow-up in BACKLOG.

Feature-branch net-new work brought in and kept (master had none):
- native task tracking (aggregate, agent tools wired into analyst/implementer/reviewer,
  dependency graph + gates, decompose, REST/CLI, TUI task board)
- critique-outcome producer (role-rel §6 — master had deferred it)
- stage-level plan checkpointing (C-A2, folded into runPostStageGates)
- CLAUDE.md/AGENTS.md L0 standing context
- cross-session grants + TUI (grant scopes/revoke, @ picker, session resume browser)

Verified: full Gradle compile (all modules + tests) green; tests pass for core:events,
core:kernel, infrastructure:workflow, apps:server, apps:cli, testing:integration; tui-go
go build + go test green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

RETRO.md

@@ -55,3 +55,38 @@ evidence to check.
   `4e5e4e5`, §5 reviewer narrow-question prompt/needs `3467826`.
 - **TUI requirements shipped halves** — §2 last-event clock + unknown-event fallback `8b896b5`, §5.1
   deterministic command-approval parse card `65df3f4`.
+
+---
+
+## 2026-06-26 — Merged `feat/backlog-burndown` into `master`
+
+`master` had advanced 16 commits past where `feat/backlog-burndown` branched, and the two had
+**independently built four of the same features**. The merge kept **master's** implementation for
+each overlap (more complete / wired to production / more robust) and dropped the feature branch's
+parallel constellation:
+
+- **llama-server health probe** — kept master's event-store-backed tokens/sec probe; dropped the
+  branch's `LlamaLivenessClient`/`HttpLlamaLivenessClient` (liveness-only, throughput unwired).
+- **event-store probe** — kept master's `EventStoreHealthProbe`; dropped the branch's
+  `EventStoreLatencyProbe`.
+- **brief echo-back gate** — kept master's `BriefEchoDiff` (Jaccard token-overlap, tolerant of
+  rewording); dropped the branch's `BriefEchoComparator`/`BriefEchoExtractor` (exact set-diff).
+- **static-first reviewer** — kept master's command/exit-code gate (`StaticAnalysisRunner` +
+  `ProcessStaticAnalysisRunner`, production-wired); dropped the branch's structured-finding
+  `static_check` *stage* (`StaticCheckStageExecutor`, `StaticFinding`, `ContextFeedback` exclusion)
+  which was a no-op pending a production runner. **Its structured-findings model is filed as a
+  follow-up in BACKLOG** so it isn't lost.
+
+**Net-new feature-branch work brought in and kept** (master had none of these):
+
+- **Native task tracking** — task aggregate + agent tools (`task_create`/`task_update`/
+  `task_context`/`task_search` wired into analyst/implementer/reviewer), dependency-aware work graph
+  (blockers/ready), claim/cite/scope/stale-write gates, `task_decompose`, REST surface, CLI, git-driven
+  status, markdown export, and the TUI task board (`OverlayTasks`, `T` key).
+- **Critique-outcome producer (role-rel §6)** — `CritiqueOutcomeCorrelator` +
+  `CritiqueFindingsRecordedEvent`/`CritiqueOutcomeCorrelatedEvent` + the per-model calibration chain
+  (master had explicitly *deferred* §6). Dormant until the reviewer emits structured findings (live-QA).
+- **Stage-level plan checkpointing (C-A2)** — `emitStageCheckpoint` folded into `runPostStageGates`.
+- **L0 standing context** — CLAUDE.md / AGENTS.md injected as agent-instruction context entries.
+- **Cross-session grants + TUI** — PROJECT/GLOBAL grant scopes + revoke, grant viewer, `@` file picker,
+  session resume browser (`OverlaySessions`, `R` key).