feat(alarm): trex-core 알람 emitter + trex.alerts exchange (dcy-033 BAT-049, Implemented)

AlarmEmitter(application, best-effort 비차단)+trex.alerts topic exchange 가산·격리+8 CRITICAL code 배선. 608 passed, opus QC PASS, 팀장 e2e(텔레그램 HTTP200) 통과. REQ-098~101 Implemented.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VHtM5Ws1HKCKQ4JGi6GRb5

trex_core/application/killswitch.py

@@ -11,7 +11,9 @@ from __future__ import annotations
 import logging
 from datetime import date as date_cls
 from datetime import datetime, timezone
+from typing import Optional
 
+from trex_core.application.alarm_emitter import AlarmEmitter
 from trex_core.application.portfolio import GLOBAL_KILLSWITCH, KillSwitchStore
 from trex_core.domain.slot import SlotRepository, SlotService
 
@@ -29,11 +31,14 @@ class KillSwitchService:
         slot_service: SlotService,
         killswitch_store: KillSwitchStore,
         instance_key: str = "default",
+        alarm_emitter: Optional[AlarmEmitter] = None,
     ) -> None:
         self._repo = slot_repo
         self._svc = slot_service
         self._store = killswitch_store
         self._instance_key = instance_key  # dcy-020/REQ-056: instance-scoped sweep
+        # dcy-033 / REQ-100: best-effort alarm emitter.
+        self._alarm_emitter = alarm_emitter
 
     @staticmethod
     def _trading_date(now: datetime) -> date_cls:
@@ -73,6 +78,14 @@ class KillSwitchService:
             "kill-switch fired: actor=%s scope=%s portfolio_id=%s liquidated=%d",
             actor, scope, portfolio_id, liquidated,
         )
+        # dcy-033 / REQ-100: CRITICAL alarm — emergency liquidation fired.
+        if self._alarm_emitter is not None:
+            self._alarm_emitter.publish_alarm(
+                "kill_switch_fired",
+                f"긴급 청산 발동: scope={scope} liquidated={liquidated}",
+                fields={"scope": scope, "portfolio_id": portfolio_id, "liquidated": liquidated,
+                        "actor": actor},
+            )
         return liquidated
 
     def resume(