miroir-r3j.2: Verify SQLite backend tables 8-14 implementation

All 7 feature-flagged tables (canaries, canary_runs, cdc_cursors, tenant_map,
rollover_policies, search_ui_config, admin_sessions) were already implemented
with full CRUD operations, migrations, and tests.

The canary_runs_auto_prune trigger was added in P3.3 (commit 719d1db).

Acceptance criteria verified:
- All 38 SQLite tests pass
- Every table round-trips insert/get correctly
- Auto-prune trigger keeps canary_runs bounded
- Empty tables consume < 16 KB overhead each
- Tables created via TaskStore::migrate() migration 002

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

notes/miroir-r3j.2.md

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+# miroir-r3j.2: SQLite Backend Tables 8-14 — Verification Complete
+
+## Task
+
+Extend the SQLite `TaskStore` with plan §4 tables 8–14:
+- Table 8: `canaries` (§13.18)
+- Table 9: `canary_runs` (§13.18) with auto-prune trigger
+- Table 10: `cdc_cursors` (§13.13)
+- Table 11: `tenant_map` (§13.15)
+- Table 12: `rollover_policies` (§13.17)
+- Table 13: `search_ui_config` (§13.21)
+- Table 14: `admin_sessions` (§13.19) with expires_at index
+
+## Implementation Status
+
+**COMPLETE** — All tables 8-14 were already implemented in:
+- `crates/miroir-core/src/task_store/sqlite.rs` — Full CRUD operations
+- `crates/miroir-core/src/task_store/mod.rs` — Trait definitions and row types
+- `crates/miroir-core/src/migrations/002_feature_tables.sql` — Schema migrations
+- `crates/miroir-core/src/schema_migrations.rs` — Migration registry
+
+The `canary_runs_auto_prune` trigger was added in commit 719d1db (P3.3).
+
+## Verification
+
+All 38 SQLite tests pass:
+```bash
+cargo test --package miroir-core --lib task_store::sqlite::tests
+```
+
+Tests covering tables 8-14:
+- `canary_upsert_get_list_delete` — Table 8 CRUD
+- `canary_runs_insert_get_and_auto_prune` — Table 9 with auto-prune
+- `cdc_cursor_upsert_get_list` — Table 10 composite PK
+- `tenant_map_insert_get_delete` — Table 11 BLOB PK
+- `rollover_policy_upsert_get_list_delete` — Table 12 CRUD
+- `search_ui_config_upsert_get_delete` — Table 13 upsert
+- `admin_session_insert_get_revoke_expire` — Table 14 lifecycle
+- `empty_tables_add_minimal_overhead_per_table` — Overhead < 16 KB per table
+- `all_tables_survive_store_reopen` — All 14 tables persist correctly
+
+## Acceptance Criteria Met
+
+1. ✅ **Every table's typed struct round-trips `insert`/`get`** — Unit tests verify
+2. ✅ **`canary_runs` trigger keeps row count ≤ `run_history_per_canary`** — Trigger implemented and tested
+3. ✅ **Empty tables consume < 16 KB overhead each** — Test verifies < 16 KB average
+4. ✅ **Tables created via `TaskStore::migrate()`** — Migration 002 registered and applied
+
+## Key Implementation Details
+
+- **`canary_runs` trigger**: Uses `NOT IN (SELECT ... ORDER BY ran_at DESC LIMIT 100)` for auto-pruning
+- **`tenant_map.api_key_hash`**: Stored as 32-byte BLOB (raw sha256)
+- **`cdc_cursors` PK**: Composite on `(sink_name, index_uid)` for update-in-place
+- **`admin_sessions_expires` index**: Enables lazy eviction scan performance