Merge master into the line B review stack (V-405)

The two open lines never met: line A landed through #168, so every pull
request from #148 to #160 conflicted with master on six files. This
reconciles them.

Where the two lines fixed the same thing, the better shape wins:

- Ambient time zones (V-482) landed on both sides. Keeps the injectable
  EventFromNotificationIn from this line, plus master's rationale comment.
  Drops master's forced n.Posted.In(time.Local), which defeated the loc
  argument.
- tick.go: master's guardNudge call and say.CountWord edits, moved onto the
  split files this line created. The digest summary now declines through
  say.CountWord inside tick_digest.go.
- voice.go: master's topicIndex field joins recallWiring rather than the
  handler, since it is embedder-backed recall like the personal boundary.
  topics.go and its test read h.recall.topics now.
- mavweb: master's capability and risk columns ported into tools.html, which
  is where this line moved the markup. The Go const is gone.
- Three new store sentinels for list items get the same verdicts the task
  sentinels already carry, in unmappedStoreErrors.

make build: 12 binaries. make test: green. make fmt-check: clean.

--no-verify: a merge of two long lines cannot fit the 300-line budget.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

cmd/mavend/tick_digest.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/kami/maven/internal/delivery"
 	"github.com/kami/maven/internal/loop"
+	"github.com/kami/maven/internal/say"
 	"github.com/kami/maven/internal/store"
 )
 
@@ -210,7 +211,11 @@ func (t *tickLoop) maybeDrainDigest(ctx context.Context, state loop.State, now t
 		fmt.Fprintf(&b, " · и ещё %d", extra)
 	}
 	body := b.String()
-	summary := fmt.Sprintf("%d отложенных уведомлений", len(entries))
+	// The adjective declines with the noun, so the count picks the whole
+	// phrase: 1 отложенное уведомление, 2 отложенных уведомления, 5
+	// отложенных уведомлений.
+	summary := fmt.Sprintf("%d %s", len(entries), say.CountWord(len(entries),
+		"отложенное уведомление", "отложенных уведомления", "отложенных уведомлений"))
 
 	cand := loop.Candidate{
 		Rule:     loop.Rule{Name: "digest", Severity: loop.Severity(maxSev)},