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>

trex_core/adapters/persistence/postgresql.py

@@ -29,7 +29,8 @@ from trex_core.domain.slot import Slot, SlotNotFoundError, SlotState, SlotTransi
 _SLOT_COLUMNS = (
     "slot_id, trading_date, status, symbol, qty, avg_price, entry_price, "
     "allocated_capital, order_id, strategy_id, broker_order_id, portfolio_id, "
-    "sell_strategy_id, forced_close_at, created_at, updated_at"
+    "sell_strategy_id, forced_close_at, stop_loss_price, take_profit_price, "
+    "created_at, updated_at"
 )
 
 
@@ -122,12 +123,14 @@ class PostgreSQLSlotRepository:
                     "UPDATE daily_slot SET status=%s, symbol=%s, qty=%s, avg_price=%s, "
                     "entry_price=%s, allocated_capital=%s, order_id=%s, strategy_id=%s, "
                     "broker_order_id=%s, portfolio_id=%s, sell_strategy_id=%s, "
-                    "forced_close_at=%s, updated_at=%s WHERE slot_id=%s",
+                    "forced_close_at=%s, stop_loss_price=%s, take_profit_price=%s, "
+                    "updated_at=%s WHERE slot_id=%s",
                     (
                         slot.status.value, slot.symbol, slot.qty, slot.avg_price,
                         slot.entry_price, slot.allocated_capital, slot.order_id,
                         slot.strategy_id, slot.broker_order_id, slot.portfolio_id,
                         slot.sell_strategy_id, slot.forced_close_at,
+                        slot.stop_loss_price, slot.take_profit_price,
                         slot.updated_at or datetime.now(tz=timezone.utc), slot.slot_id,
                     ),
                 )
@@ -229,7 +232,14 @@ class PostgreSQLSlotRepository:
 
     @staticmethod
     def _row_to_slot(row: tuple) -> Slot:
+        from decimal import Decimal
         f = lambda v: float(v) if v is not None else None  # noqa: E731
+        d = lambda v: Decimal(str(v)) if v is not None else None  # noqa: E731
+        # Column order: slot_id(0) trading_date(1) status(2) symbol(3) qty(4)
+        # avg_price(5) entry_price(6) allocated_capital(7) order_id(8)
+        # strategy_id(9) broker_order_id(10) portfolio_id(11) sell_strategy_id(12)
+        # forced_close_at(13) stop_loss_price(14) take_profit_price(15)
+        # created_at(16) updated_at(17)
         return Slot(
             slot_id=row[0] if isinstance(row[0], UUID) else UUID(str(row[0])),
             trading_date=row[1],
@@ -245,8 +255,10 @@ class PostgreSQLSlotRepository:
             portfolio_id=row[11],
             sell_strategy_id=row[12],
             forced_close_at=row[13],
-            created_at=row[14],
-            updated_at=row[15],
+            stop_loss_price=d(row[14]),
+            take_profit_price=d(row[15]),
+            created_at=row[16],
+            updated_at=row[17],
         )