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/application/test_ledger_option_d.py

@@ -1,7 +1,7 @@
 """Option D cash/position write-back + estimate overlay tests (dcy-018, issue: cash stale).
 
 Covers: LedgerWriter write-back to SnapshotStore on new/duplicate, skip when
-*_after missing, best-effort isolation, and the snapshot handler's estimated-cash
+*_after missing, best-effort isolation, and the slots handler's estimated-cash
 overlay from pending outbox deltas (OQ-4).
 """
 from __future__ import annotations
@@ -15,8 +15,10 @@ from trex_core.application.ledger_outbox import (
     trade_cash_delta,
 )
 from trex_core.application.ledger_port import LedgerTrade
-from trex_core.application.messaging_handlers import _apply_cash_estimate
+from trex_core.application.messaging import RpcRequest
+from trex_core.application.messaging_handlers import make_slots_rpc_handler
 from trex_core.application.portfolio import PortfolioItem, SnapshotStore
+from trex_core.domain.slot.in_memory_repository import InMemorySlotRepository
 
 UTC = timezone.utc
 
@@ -88,7 +90,7 @@ def test_no_writeback_without_store():
     assert writer.run_once().completed == 1  # no crash
 
 
-# --- estimate overlay (REQ-029 / OQ-4) -------------------------------------
+# --- estimate overlay (REQ-029 / OQ-4) — via make_slots_rpc_handler ----------
 def test_pending_cash_delta_sums_by_asset():
     outbox = InMemoryLedgerOutbox()
     outbox.enqueue(_trade(execution_id="b", side="buy", qty=10, price=1000.0, fee=1.0))
@@ -98,14 +100,18 @@ def test_pending_cash_delta_sums_by_asset():
 
 
 def test_apply_cash_estimate_overlays_pending_delta():
+    """Cash-estimated overlay applied through slots handler (REQ-029 OQ-4)."""
     outbox = InMemoryLedgerOutbox()
     outbox.enqueue(_trade(execution_id="b", side="buy", qty=10, price=1000.0, fee=1.0))
-    payload = {"assets": [{"asset_id": "PF-1", "symbol": "005930",
-                           "cash_balance": 1_000_000.0, "asset_quantity": 0.0}]}
-    _apply_cash_estimate(payload, outbox)
-    a = payload["assets"][0]
-    assert a["cash_estimated"] is True
-    assert a["cash_balance"] == 1_000_000.0 - (10 * 1000.0 + 1.0)  # estimated cash
+    store = _store_with(pid="PF-1", cash=1_000_000.0, qty=0.0)
+    repo = InMemorySlotRepository()
+    repo.reconcile_universe("default", {"PF-1"})
+    handler = make_slots_rpc_handler(repo, snapshot_store=store, ledger_outbox=outbox)
+    resp = handler(RpcRequest(payload={"filter": "all"}, correlation_id="test"))
+    slots = resp.payload["slots"]
+    pf1 = next(s for s in slots if s["portfolio_id"] == "PF-1")
+    assert pf1["cash_estimated"] is True
+    assert pf1["cash_balance"] == 1_000_000.0 - (10 * 1000.0 + 1.0)  # estimated cash
 
 
 def test_estimate_clears_after_writeback():