P3: Verify Phase 3 Task Registry + Persistence completion

Verified all Definition of Done items:
- SQLite backend with 14 tables, WAL mode, migrations
- Redis backend with plan §4 keyspace layout
- 36 SQLite tests passing
- Redis integration tests with testcontainers
- Helm schema validation: taskStore.backend: redis ⇔ replicas > 1
- Restart resilience tests (task_survives_store_reopen)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.beads/traces/miroir-r3j/metadata.json

@@ -5,11 +5,11 @@
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-  "captured_at": "2026-05-03T12:35:58.844453592Z",
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.beads/traces/miroir-uhj/metadata.json

@@ -5,11 +5,11 @@
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