feat(intents): dcy-011 buy intent portfolio_id 필수 계약 + ledger skip 가시화 (BAT-015)

dcy-011 전 주기 delivery. issue #6(buy 식별자 정정) + issue #11(ledger silent skip) 흡수.
거버넌스: 기존 Implemented REQ는 change-req, 신규 기능만 신규 REQ(OQ-3).

- REQ-007 (change-req): buy admission portfolio_id 필수화 + SnapshotStore symbol
  resolve + unknown_portfolio 거부 (hard cutover, OQ-1/OQ-2)
- REQ-021 (change-req): buy 메시지 payload symbol 제거
- REQ-018 (change-req): _record_ledger skip 가시화 (WARN + ledger_skipped 카운터)
- REQ-055 (신규): closed↔ledger_outbox anti-join 운영 점검 find_ledger_gap_slots

코드: intents.py(BuyIntent portfolio_id 필수 + resolve_symbol 주입 + _admit_buy
reject 분기), messaging_handlers.py, runtime/daemon.py(_resolve_symbol 배선),
execution.py(skip WARN 로그), adapters/persistence/ops_checks.py(신규 anti-join).

검증: 단위 282 passed/32 skipped, 인프라 게이트(PG+RabbitMQ) 314 passed, ruff clean.
BAT-015(standard) release-candidate. srs/index Next ID → REQ-056.

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

trex_core/adapters/persistence/ops_checks.py

@@ -0,0 +1,47 @@
+"""Operational integrity checks — read-only (REQ-055 / dcy-011 FR-5, issue #11).
+
+`find_ledger_gap_slots` detects `closed` slots that produced NO ledger_outbox
+row (the silent-skip symptom): either `portfolio_id IS NULL` (skip at fill) or
+no outbox row carries the slot's portfolio_id as `asset_id`. Read-only — no
+schema change; `daily_slot` is durable so this is a permanent detector even
+without an outbox marker row (dcy-010 OQ-4).
+"""
+from __future__ import annotations
+
+from datetime import date
+from typing import Any, Optional
+
+from trex_core.adapters.persistence.postgresql import _require_psycopg
+
+_LEDGER_GAP_SQL = """
+SELECT s.slot_id, s.trading_date, s.symbol, s.portfolio_id, s.broker_order_id
+FROM daily_slot s
+WHERE s.status = 'closed'
+  AND (%(td)s::date IS NULL OR s.trading_date = %(td)s)
+  AND (
+        s.portfolio_id IS NULL
+        OR NOT EXISTS (
+            SELECT 1 FROM ledger_outbox o WHERE o.asset_id = s.portfolio_id
+        )
+      )
+ORDER BY s.trading_date, s.slot_id
+"""
+
+_COLS = ("slot_id", "trading_date", "symbol", "portfolio_id", "broker_order_id")
+
+
+def find_ledger_gap_slots(
+    dsn: str,
+    *,
+    trading_date: Optional[date] = None,
+    psycopg_module: Any = None,
+) -> list[dict]:
+    """Return closed slots with no corresponding ledger_outbox row (FR-5).
+
+    Pass `trading_date` to scope to one day; omit for all days.
+    """
+    psycopg = _require_psycopg(psycopg_module)
+    with psycopg.connect(dsn) as conn:
+        with conn.cursor() as cur:
+            cur.execute(_LEDGER_GAP_SQL, {"td": trading_date})
+            return [dict(zip(_COLS, row)) for row in cur.fetchall()]