feat(rel-007): dcy-025/024 + BAT-035/036 — slots.req 즉시 교체 + safety_sell_enabled

BAT-035 (dcy-025): trex.snapshot.req → trex.slots.req 즉시 교체
- topology: SNAPSHOT_REQ_QUEUE 제거, SLOTS_REQ_QUEUE = "trex.slots.req" 추가
- portfolio.py: View/build_snapshot_envelope/SnapshotEnvelope/_asset_to_dict 제거;
  slot_to_dict 시그니처 확장(snapshot_store/watchdog_store/pause_store/watchdog_timeout_sec)
  — asset_quantity(hub)/cash_balance/cash_estimated/warned/watchdog{}/paused 병합 (REQ-074)
- messaging_handlers.py: make_snapshot_rpc_handler 제거, make_slots_rpc_handler 추가
  — filter(all/inactive/pending/holding/error) + spy(bool) 처리; strategy 필드 제외 (REQ-073/074)
- daemon.py: _snapshot_rpc_loop → _slots_rpc_loop, make_slots_rpc_handler 연결
- cli.py: universe/slots → slots_queue + spy=True + server-side filter; buyable→inactive 매핑 (REQ-063)
- rabbitmq.py: snapshot_queue → slots_queue
- docs: interface-contract.md + runtime-flows.md slots.req 계약으로 업데이트 (REQ-075)
- REQ-028: Implemented → Deprecated (코드 삭제 완료)
- 테스트: test_snapshot_handler/selection/rpc_watchdog/messaging_snapshot_consumer 삭제;
  test_slots_handler.py(신규, 13 cases), test_killswitch_masking_resume 재작성,
  test_ledger_option_d._apply_cash_estimate → slots handler 경유, test_topology/cli_operator 갱신

BAT-036 (dcy-024): per-instance safety_sell_enabled 플래그
- config.py: DaemonInstanceConfig + DaemonConfig 에 safety_sell_enabled: bool = True 추가;
  from_toml 파싱, from_config 전파
- daemon.py: start() workers 조건부 — safety_sell_enabled=false 시 trex-safety-sell 미기동 + WARNING
- tests: test_instance_config.py 에 safety_sell_enabled 파싱 3개 케이스 추가

REQ: 073/074/075/021/034/063/048/005 Approved → Implemented

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

tests/adapters/messaging/test_instance_topology.py

@@ -20,14 +20,14 @@ from trex_core.adapters.messaging.rabbitmq import RabbitMQTransport
 def test_named_instance_suffix():
     """REQ-049 AC-1."""
     assert topology.intent_queue("inst-1") == "trex.intent.req.inst-1"
-    assert topology.snapshot_queue("inst-1") == "trex.snapshot.req.inst-1"
+    assert topology.slots_queue("inst-1") == "trex.slots.req.inst-1"
     assert topology.control_queue("inst-1") == "trex.control.req.inst-1"
 
 
 def test_default_is_literal():
     """REQ-049 AC-2: default keeps legacy literal names (backward-compat)."""
     assert topology.intent_queue("default") == "trex.intent.req"
-    assert topology.snapshot_queue(None) == "trex.snapshot.req"
+    assert topology.slots_queue(None) == "trex.slots.req"
     assert topology.control_queue() == "trex.control.req"
 
 
@@ -52,7 +52,7 @@ def _delete_instance_queues(url, instance_key):
     conn = pika.BlockingConnection(pika.URLParameters(url))
     try:
         ch = conn.channel()
-        for q in (topology.intent_queue(instance_key), topology.snapshot_queue(instance_key),
+        for q in (topology.intent_queue(instance_key), topology.slots_queue(instance_key),
                   topology.control_queue(instance_key)):
             try:
                 ch.queue_delete(queue=q)