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>

tests/application/test_execution_ledger.py

@@ -80,7 +80,13 @@ def test_portfolio_id_absent_skips_ledger_but_transitions_slot():
     ledger = InMemoryLedger()
     repo, svc, intents, execution, outbox, writer = _wire(PaperBroker(fill_after_polls=0),
                                                           ledger=ledger)
-    sid = _buy(intents, iid="no-pf", portfolio_id=None).slot_id
+    # dcy-011: buy admission now requires portfolio_id, so create the
+    # pending_buy slot directly (bypass admission) to exercise the
+    # execution-loop ledger skip + visibility (REQ-018 FR-4).
+    idle = repo.find_idle_slot(DAY)
+    svc.transit_slot(idle.slot_id, SlotState.IDLE, SlotState.PENDING_BUY,
+                     reason="buy", actor="test", symbol="005930", portfolio_id=None)
+    sid = idle.slot_id
     r = execution.run_once()
     assert r.filled == 1 and r.ledger_enqueued == 0 and r.ledger_skipped == 1
     assert repo.fetch_slot(sid).status is SlotState.HOLDING
@@ -88,6 +94,21 @@ def test_portfolio_id_absent_skips_ledger_but_transitions_slot():
     assert ledger.count() == 0
 
 
+def test_ledger_skip_emits_warning(caplog):
+    """dcy-011 / REQ-018 FR-4 (S-3): ledger skip is logged, not silent."""
+    import logging
+    ledger = InMemoryLedger()
+    repo, svc, intents, execution, outbox, writer = _wire(PaperBroker(fill_after_polls=0),
+                                                          ledger=ledger)
+    idle = repo.find_idle_slot(DAY)
+    svc.transit_slot(idle.slot_id, SlotState.IDLE, SlotState.PENDING_BUY,
+                     reason="buy", actor="test", symbol="005930", portfolio_id=None)
+    with caplog.at_level(logging.WARNING, logger="trex_core.application.execution"):
+        execution.run_once()
+    msgs = [r.getMessage() for r in caplog.records]
+    assert any("ledger skip" in m and "missing_portfolio_id" in m for m in msgs)
+
+
 def test_duplicate_execution_id_results_in_zero_duplicate_in_ledger():
     """REQ-019 AC-1: same execution_id processed twice = 1 ledger entry."""
     ledger = InMemoryLedger()