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/runtime/config.py

@@ -69,6 +69,22 @@ class SnapshotScheduleConfig:
     tick_sec: float = 60.0
 
 
+@dataclass(frozen=True)
+class SafetySellConfig:
+    """Safety-sell feature tuning (REQ-041 / BAT-010).
+
+    All five env vars are parsed here even though only WATCHDOG_TIMEOUT and
+    WATCHDOG_GRACE_PERIOD are consumed in BAT-010; the remaining three are
+    used by BAT-011 trigger loops once they land.
+    """
+
+    watchdog_timeout_sec: int = 120
+    watchdog_grace_period_sec: int = 60
+    forced_close_check_interval_sec: int = 60
+    stop_loss_poll_interval_sec: int = 30
+    market_close_liquidation_time: Optional[str] = None  # "HH:MM" KST, optional
+
+
 @dataclass(frozen=True)
 class DaemonConfig:
     dsn: str
@@ -87,6 +103,8 @@ class DaemonConfig:
     rabbitmq: Optional[RabbitMQConfig] = None
     # REQ-030 (BAT-008): daily snapshot refresh.
     snapshot_schedule: SnapshotScheduleConfig = SnapshotScheduleConfig()
+    # REQ-041 (BAT-010): safety-sell feature config.
+    safety_sell: SafetySellConfig = SafetySellConfig()
 
     @staticmethod
     def from_env() -> "DaemonConfig":
@@ -136,6 +154,18 @@ class DaemonConfig:
             kst_time=os.environ.get("TREX_SNAPSHOT_SCHEDULE_KST", "07:30").strip() or "07:30",
             tick_sec=float(os.environ.get("TREX_SNAPSHOT_TICK_SEC", "60")),
         )
+        _mc_time = os.environ.get("TREX_MARKET_CLOSE_LIQUIDATION_TIME", "").strip() or None
+        safety_sell = SafetySellConfig(
+            watchdog_timeout_sec=int(os.environ.get("TREX_WATCHDOG_TIMEOUT", "120")),
+            watchdog_grace_period_sec=int(os.environ.get("TREX_WATCHDOG_GRACE_PERIOD", "60")),
+            forced_close_check_interval_sec=int(
+                os.environ.get("TREX_FORCED_CLOSE_CHECK_INTERVAL", "60")
+            ),
+            stop_loss_poll_interval_sec=int(
+                os.environ.get("TREX_STOP_LOSS_POLL_INTERVAL", "30")
+            ),
+            market_close_liquidation_time=_mc_time,
+        )
         return DaemonConfig(
             dsn=dsn,
             total_slots=int(os.environ.get("TREX_TOTAL_SLOTS", "10")),
@@ -147,4 +177,5 @@ class DaemonConfig:
             ledger_interval_sec=float(os.environ.get("TREX_LEDGER_INTERVAL_SEC", "1.0")),
             rabbitmq=rabbitmq,
             snapshot_schedule=snapshot_schedule,
+            safety_sell=safety_sell,
         )