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/runtime/test_instance_config.py

@@ -88,3 +88,30 @@ def test_gitignore_excludes_instance_toml():
     assert "/config/*" in gi
     assert "!/config/*.example.toml" in gi
     assert "!/config/.env.example" in gi
+
+
+# --- safety_sell_enabled (REQ-048 CHG-20260611-01, BAT-036) -----------------
+
+def test_safety_sell_enabled_default_true(tmp_path, monkeypatch):
+    """AC-10: absent from TOML → safety_sell_enabled=True (default on)."""
+    monkeypatch.setenv("TREX_POSTGRESQL_DSN", "postgresql://x/y")
+    inst = DaemonInstanceConfig.from_toml(_write_toml(tmp_path, 'instance_key = "i3"\n'))
+    assert inst.safety_sell_enabled is True
+    cfg = DaemonConfig.from_config(_write_toml(tmp_path, 'instance_key = "i3"\n'))
+    assert cfg.safety_sell_enabled is True
+
+
+def test_safety_sell_enabled_false_from_toml(tmp_path, monkeypatch):
+    """AC-10: safety_sell_enabled = false in TOML → DaemonConfig.safety_sell_enabled=False."""
+    monkeypatch.setenv("TREX_POSTGRESQL_DSN", "postgresql://x/y")
+    path = _write_toml(tmp_path, 'instance_key = "i4"\nsafety_sell_enabled = false\n')
+    cfg = DaemonConfig.from_config(path)
+    assert cfg.safety_sell_enabled is False
+
+
+def test_safety_sell_enabled_true_explicit_from_toml(tmp_path, monkeypatch):
+    """AC-10: safety_sell_enabled = true in TOML → DaemonConfig.safety_sell_enabled=True."""
+    monkeypatch.setenv("TREX_POSTGRESQL_DSN", "postgresql://x/y")
+    path = _write_toml(tmp_path, 'instance_key = "i5"\nsafety_sell_enabled = true\n')
+    cfg = DaemonConfig.from_config(path)
+    assert cfg.safety_sell_enabled is True