feat(intents): dcy-011 buy intent portfolio_id 필수 계약 + ledger skip 가시화 (BAT-015)

dcy-011 전 주기 delivery. issue #6(buy 식별자 정정) + issue #11(ledger silent skip) 흡수.
거버넌스: 기존 Implemented REQ는 change-req, 신규 기능만 신규 REQ(OQ-3).

- REQ-007 (change-req): buy admission portfolio_id 필수화 + SnapshotStore symbol
  resolve + unknown_portfolio 거부 (hard cutover, OQ-1/OQ-2)
- REQ-021 (change-req): buy 메시지 payload symbol 제거
- REQ-018 (change-req): _record_ledger skip 가시화 (WARN + ledger_skipped 카운터)
- REQ-055 (신규): closed↔ledger_outbox anti-join 운영 점검 find_ledger_gap_slots

코드: intents.py(BuyIntent portfolio_id 필수 + resolve_symbol 주입 + _admit_buy
reject 분기), messaging_handlers.py, runtime/daemon.py(_resolve_symbol 배선),
execution.py(skip WARN 로그), adapters/persistence/ops_checks.py(신규 anti-join).

검증: 단위 282 passed/32 skipped, 인프라 게이트(PG+RabbitMQ) 314 passed, ruff clean.
BAT-015(standard) release-candidate. srs/index Next ID → REQ-056.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/srs/index.md

@@ -74,7 +74,7 @@
 
 ## Next Requirement ID
 
-- Current: `REQ-055`
+- Current: `REQ-056`
 - Rule: `Requirement Register`에 있는 가장 큰 REQ 번호보다 정확히 1 커야 한다.
 
 ## Requirement Register
@@ -135,11 +135,12 @@
 | REQ-052 | safety-sell per-slot 재시도 쿨다운 + 영속 거부 경고 | Integration | Implemented | High | project maintainers | [req-052](./Integration/req-052_safety-sell-per-slot-cooldown.md) |
 | REQ-053 | safety-sell 재시도 쿨다운 env 설정 2종 | Configuration | Implemented | Medium | project maintainers | [req-053](./Configuration/req-053_safety-sell-retry-cooldown-env.md) |
 | REQ-054 | safety-sell 쿨다운 runtime-flows 정합 | Documentation | Implemented | Low | project maintainers | [req-054](./Documentation/req-054_safety-sell-cooldown-baseline-alignment.md) |
+| REQ-055 | closed 슬롯 ↔ ledger_outbox 누락 운영 점검 쿼리 | Exception | Implemented | Medium | project maintainers | [req-055](./Exception/req-055_ledger-gap-ops-check.md) |
 
 ## Recent Change Log Summary
 
+- 2026-06-08 :: REQ-007/018/021 change-req + REQ-055 생성·Implemented (dcy-011, BAT-015): buy intent 계약 hard cutover — portfolio_id 필수화 + symbol 서버 resolve(SnapshotStore) + unknown_portfolio/portfolio_id_required 거부(REQ-007), buy payload symbol 제거(REQ-021), ledger skip 가시화(WARN+ledger_skipped 카운터, REQ-018), closed↔outbox anti-join 운영 점검 `find_ledger_gap_slots` 신규(REQ-055). 전체 인프라 게이트 314 passed, ruff clean. (change-req/draft-req/confirm-req-implemented)
 - 2026-06-08 :: REQ-052~054 Approved → Implemented (confirm-req-implemented): BAT-014(batch-lite) verify 완료(신규 8 단위, 전체 278 passed, ruff clean). SafetySellService per-slot 쿨다운(skip/만료재시도/경고/prune, market_close 제외), SafetySellConfig env 2종(min_retry_interval_sec 600/max_retry_warn_count 3), runtime-flows 정합. (confirm-req-implemented)
 - 2026-06-08 :: REQ-052~054 Proposed → Approved (confirm-req): dcy-010 safety-sell 쿨다운 3개 전원 승인 게이트 통과. dcy-010(confirmed) FR/OQ 와 모순 없음, 필수 필드·구체 AC 완비. 피드백 채널·DB 영속은 Out of Scope 비핵심. (confirm-req)
 - 2026-06-08 :: REQ-052~054 생성 (draft-req): dcy-010(safety-sell 영속 거부 재시도 백오프, confirmed) → 3개 REQ 초안. per-slot 쿨다운+경고(052), 쿨다운 env 2종(053), runtime-flows 정합(054). OQ-1(600s)/OQ-2(3회 경고)/OQ-3(단일 per-slot) Answered. (draft-req)
 - 2026-06-07 :: REQ-048~051 Approved → Implemented (confirm-req-implemented): BAT-013 verify 완료(신규 9 단위 + RabbitMQ 라우팅 2, 단위 271 passed, 인프라 게이트 301 passed(directed 격리 S-2 + broadcast dual S-3 + default 무회귀 S-4), ruff clean). per-instance TOML 로더+`--config`, instance_key 동적 큐명(default 리터럴 하위호환), trex.direct/trex.broadcast exchange+바인딩, baseline 3문서 정합. (confirm-req-implemented)
-- 2026-06-07 :: REQ-048~051 Proposed → Approved (confirm-req): dcy-009 multi-instance 4개 전원 승인 게이트 통과. dcy-009(confirmed) FR/OQ 와 모순 없음, 필수 필드·구체 AC 완비. strategy publish 변경·TOML 추가필드는 비핵심 후속. (confirm-req)