Deliver BAT-002: slot-core daemon + HTTP intent API + PostgreSQL

Implement REQ-005~009 (dcy-002 slice 1) as an onion stack on top of the
BAT-001 pure domain:
- application: IntentService (admission + single-writer transition +
  intent_id idempotency via durable intent_log)
- adapters/persistence: PostgreSQLSlotRepository + PostgreSQLIntentStore +
  trex-core-owned migrations (daily_slot per Appendix A, daily_symbol_entries,
  slot_transition_log, intent_log) + in-memory intent store
- adapters/api: FastAPI /v1 (healthz, intents/buy|sell|{id}, slots, capacity)
- runtime: trex-core-daemon entrypoint with lifespan migrate+preallocate

Verification (against local PostgreSQL 18): 74 passed, ruff clean, domain
import sweep shows zero web/db deps (NFR-1), 20-thread concurrency admits
exactly the idle count (NFR-2), idempotent resubmit causes no double
transition (NFR-3), EXPECTED_SLOT_FIELDS<->information_schema drift test
(realizes dcy-001 OQ-2's deferred DB-side check), and a daemon E2E smoke.

Align all four baseline docs to the new daemon/API/persistence layers.
BAT-002 -> release-candidate; REQ-005~009 -> Implemented. Full async outbox,
broker execution, safety floor, and strategy daemons remain deferred to a
follow-up Discovery.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/srs/Documentation/req-009_daemon-api-baseline-alignment.md

@@ -1,6 +1,6 @@
 # req-009: 데몬/API/영속화 baseline 문서 정합
 
-- Status: Approved
+- Status: Implemented
 - Type: Documentation
 - Priority: Medium
 - Owner: project maintainers
@@ -108,3 +108,44 @@
 
 #### Validation Plan
 - 승인 후 batch planning 에서 본 REQ 의 Acceptance Criteria 를 검증 기준으로 사용.
+
+### CHG-20260603-03
+- Date: 2026-06-03
+- Author: Justin Ko
+
+#### Change Summary
+- Status Approved → Implemented (confirm-req-implemented, 근거 batch BAT-002 release-candidate).
+
+#### Intent
+- BAT-002 verification.md 의 acceptance mapping + evidence(pytest 74 pass / PG 통합 / 데몬 E2E)로 모든 AC 충족 → 구현 완료 동기화.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register Implemented)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - BAT-002 (release-candidate)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: draft-release 로 release 편성
+
+#### Validation Plan
+- BAT-002 verification evidence 재참조로 충분.