Deliver BAT-004: broker execution + KIS adapter + durable handoff

Implement REQ-011~015 (dcy-003): the order-execution layer on top of the
BAT-002 slot-core daemon, connecting intents to real orders.
- application: BrokerPort (submit/poll_fill/cancel) + ExecutionService
  (claim -> submit -> poll -> transition -> rollback -> reconcile)
- adapters/broker: PaperBroker (deterministic async double) and KISBroker
  (KIS Open API: token, order-cash, inquire-daily-ccld, cancel; VTS sandbox
  tr_ids; live account gated behind allow_live)
- persistence: option-A execution queue (find_pending_for_dispatch FOR
  UPDATE SKIP LOCKED, mark_dispatched idempotency guard, clear_dispatch)
- runtime: background execution loop in the daemon lifespan + startup
  reconcile; config selects paper|kis

Verification (real KIS VTS 모의투자 + PostgreSQL): 92 passed, ruff clean,
domain import sweep shows zero broker/web/db deps, buy->holding /
sell->closed / reject->idle, idempotent dispatch (exactly one order),
reconcile after crash creates no duplicate order, KIS sandbox token+submit
round-trip, and a daemon E2E through the background loop. Align the four
baseline docs. BAT-004 -> release-candidate; REQ-011~015 -> Implemented.

KIS live-account go-live, partial-fill accrual, option-B outbox, connection
pooling, and the safety floor remain deferred to follow-up Discoveries.

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

docs/srs/Documentation/req-015_broker-execution-baseline-alignment.md

@@ -1,6 +1,6 @@
 # req-015: 브로커/집행 baseline 문서 정합
 
-- Status: Proposed
+- Status: Implemented
 - Type: Documentation
 - Priority: Medium
 - Owner: project maintainers
@@ -67,3 +67,83 @@
 
 #### Validation Plan
 - baseline 문서와 실제 구현(레이어/흐름/계약) 대조로 검증.
+### CHG-20260604-02
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Proposed → Approved (confirm-req).
+
+#### Intent
+- 승인 게이트(필수 필드·구체 AC·blocker 없음) 충족, source dcy-003(confirmed, handoff 승인)와 모순 없음 확인.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register 상태 Approved)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - none (batch 편성 전)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: suggest-batch-reqs / draft-batch 로 delivery batch 편성
+
+#### Validation Plan
+- 승인 후 batch planning 에서 본 REQ 의 Acceptance Criteria 를 검증 기준으로 사용.
+### CHG-20260604-03
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Approved → Implemented (confirm-req-implemented, 근거 batch BAT-004 release-candidate).
+
+#### Intent
+- BAT-004 verification.md 의 acceptance mapping + evidence(pytest 92 pass / 도메인 순수성 / 데몬 E2E / KIS VTS 모의투자 round-trip)로 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-004 (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(BAT-001~004)
+
+#### Validation Plan
+- BAT-004 verification evidence 재참조로 충분.