feat(bat-054): 그날-시작 KIS 인증정보 양의 경로 주입 — KISBroker reinitialize (REQ-113 AC-2/AC-4, REQ-115 AC-1)

BAT-053 스캐폴드에서 연기된 양의 경로 완성:
- KISBroker.reinitialize(credential): app_key/app_secret/account_ref 교체 + L1 token 무효화
- SnapshotScheduler에 kis_reinit_callback 주입 지점 추가; 그날-시작 성공 시 callback 호출
- daemon.py에 _build_kis_reinit_callback() 헬퍼 + SnapshotScheduler 조립 수정
- 신규 테스트 12개 추가: 757 passed / 47 skipped (기존 745 대비 +12, 회귀 0)

안전 불변식 유지:
- credential_fetch_enabled=False(기본) 경로 byte-for-byte 보존
- fail-closed 불변식 미파괴 (reinit 실패 시 entry_allowed 유지)
- AMQP wire 계약 변경 없음

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VHtM5Ws1HKCKQ4JGi6GRb5

docs/batches/index.md

@@ -60,4 +60,5 @@
 | BAT-050 | standard | release-candidate | REQ-102, REQ-103, REQ-104, REQ-107, REQ-108 | dcy-034 (core-A) | [bat-050](./bat-050_20260626_reconcile-warning-blocking-gate-core-a/) |
 | BAT-051 | standard | release-candidate | REQ-105, REQ-106 | dcy-034 (core-B) | [bat-051](./bat-051_20260626_sync-verify-cli-cold-start-core-b/) |
 | BAT-052 | standard | release-candidate | REQ-109, REQ-110, REQ-111 | dcy-035 | [bat-052](./bat-052_20260626_wac-realized-pnl-report/) |
-| BAT-053 | standard | in-progress | REQ-112, REQ-113, REQ-114, REQ-115 | dcy-036 | [bat-053](./bat-053_20260628_daystart-credential-fetch-failsafe/) |
+| BAT-053 | standard | release-candidate | REQ-112, REQ-113, REQ-114, REQ-115 | dcy-036 | [bat-053](./bat-053_20260628_daystart-credential-fetch-failsafe/) |
+| BAT-054 | standard | in-progress | REQ-113 (AC-2/AC-4 보강), REQ-115 (AC-1) | dcy-036 | [bat-054](./bat-054_20260628_daystart-credential-kis-inject/) |