feat(safety-sell): dcy-007 core 자율 안전 매도 — BAT-010 기반 + BAT-011 트리거

dcy-007(core 자율 안전 매도) 전체 delivery. BAT-010 기반 인프라가 미커밋
상태였고 BAT-011 트리거 레이어와 공유 파일에서 섞여 있어 한 커밋으로 묶음.

BAT-010 (REQ-034/035/036/041, release-candidate):
- WatchdogStore(application/watchdog.py) + snapshot RPC 워치독 갱신
- Slot stop_loss_price/take_profit_price 필드 + 004_add_price_thresholds.sql
- SlotService.sell() 자율 매도 내부 경로 + idempotency
- SafetySellConfig env 5종 파싱

BAT-011 (REQ-037/038/039/040/042, release-candidate):
- SafetySellService(application/safety_sell.py): forced_close 만기 / stop-loss·
  take-profit KIS polling / 장 마감 강제 청산 + trex-safety-sell 7번째 스레드
- BrokerPort.get_current_price + KIS inquire-price(TTTC8397R/VTTC8397R, stck_prpr)
  + paper stub
- SlotService.update_thresholds() + intent RPC update_thresholds 액션
  (부분 갱신/null 해제, 워치독 last_seen_at 리셋)
- baseline 3문서 정합(interface-contract/runtime-flows/project-structure)

거버넌스: REQ-034~042 Implemented 동기화, BAT-010/011 release-candidate,
dcy-007 discovery 포함.

검증: 신규 38 테스트 green, 단위 236 passed/23 skipped,
인프라 게이트(PG+RabbitMQ) 259 passed(마이그레이션 001~004 round-trip 포함),
ruff clean.

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

docs/batches/index.md

@@ -17,3 +17,5 @@
 | BAT-007 | standard | released | REQ-021, REQ-022, REQ-023, REQ-024, REQ-025, REQ-026 | dcy-006 | [bat-007](./bat-007_20260605_strategy-module-rabbitmq-transport/) |
 | BAT-008 | standard | released | REQ-027, REQ-028, REQ-029, REQ-030, REQ-031, REQ-032, REQ-033 | dcy-005 | [bat-008](./bat-008_20260606_portfolio-hub-snapshot-read-layer/) |
 | BAT-009 | batch-lite | release-candidate | REQ-010 (CHG-20260606-01 / AC-5) | dcy-002 | [bat-009](./bat-009_20260606_paper-broker-env-tuning/) |
+| BAT-010 | standard | release-candidate | REQ-034, REQ-035, REQ-036, REQ-041 | dcy-007 | [bat-010](./bat-010_20260607_safety-sell-foundation/) |
+| BAT-011 | standard | release-candidate | REQ-037, REQ-038, REQ-039, REQ-040, REQ-042 | dcy-007 | [bat-011](./bat-011_20260607_safety-sell-triggers/) |