feat(slot): BAT-030 — 자산 중심 cutover 완성 (dcy-020 BAT-δ, REQ-056·057·062·064·065)

M1 literal inactive 전면화: SlotState 5-state(idle/closed 별칭 제거),
마이그레이션 010(CHECK 교체+행 rewrite), ops_checks 를 transition_log 기반 재작성.
M2 집행 매도 수량 브로커 정본(D3): dispatch 매도 qty=broker hldg_qty,
미러 fallback 없음, 브로커 0 → skip+WARN, 리스트 기반 dispatch(head-block 방지).
M3 컬럼 drop + legacy pool 제거: 마이그레이션 011(trading_date·entry_count DROP),
repo 계약 instance 스코프 개편(집행 큐 포함), preallocation 폐기(데몬 7스레드),
admission 자산 중심 단일 경로(slot_id 정본), capacity 재정의(available=M−active),
daily_symbol_entries 코드 경로 제거.
M4 cutover 도구(D1·D4): trex-core-cutover(전체 rebuild, preflight/브로커 carry-over/
--allow-unmapped/--promote-unique/dry-run) + PG 리허설 테스트 8건.
M5 baseline 마감: data-model/runtime-flows/project-structure/interface-contract
자산 중심 최종 갱신 + run-trex-core-daemon 스킬 정합.

검증: 단위 367 passed + ruff clean; PG-gated 29 passed(010/011 round-trip·드리프트
가드·cutover 리허설); RabbitMQ 21 passed; run-the-app e2e(test DB+실 MQ, M=1):
reconcile 슬롯 생성→slot_id 매수→dedup→capacity_full→fill→already_active→
매도→inactive(자산 바인딩 보존)→영구 슬롯 재활성 전 구간 green.
실 cutover 는 운영자 실행(REL 단계, D4).

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

trex_core/domain/slot/models.py

@@ -1,8 +1,8 @@
-"""Slot domain data classes (REQ-001, REQ-002)."""
+"""Slot domain data classes (REQ-001, REQ-002; dcy-020/REQ-056 asset-centric)."""
 from __future__ import annotations
 
 from dataclasses import dataclass, field
-from datetime import date, datetime
+from datetime import datetime
 from decimal import Decimal
 from typing import Optional
 from uuid import UUID
@@ -14,43 +14,37 @@ from trex_core.domain.slot.state import SlotState
 class Slot:
     """Single daily_slot row.
 
-    Matches the slot column contract recorded in dcy-001 부록 A and
-    docs/data-model.md (trex-core stores this in-memory for now; a future
-    persistence layer must satisfy the same contract).
+    dcy-020/REQ-056 (BAT-030): the slot is a **permanent asset slot** — one row
+    per (instance_key, portfolio_id) universe asset, living across trading days.
+    Pool-model columns `trading_date` and `entry_count` were dropped at the
+    cutover (migration 011); time attributes live on events/ledger rows, not on
+    the slot. Matches docs/data-model.md.
     """
 
     slot_id: UUID
-    trading_date: date
     status: SlotState
     symbol: Optional[str] = None
     qty: Optional[float] = None
     avg_price: Optional[float] = None
     # dcy-012 / REQ-002: side-agnostic "current pending order limit price"
     # (renamed from entry_price). Set on pending entry (buy/sell limit), cleared
-    # on pending exit (→HOLDING, →CLOSED) so a buy limit never leaks into a sell
-    # order (issue #10). None => market order at dispatch.
+    # on pending exit (→HOLDING, →INACTIVE) so a buy limit never leaks into a
+    # sell order (issue #10). None => market order at dispatch.
     limit_price: Optional[float] = None
     allocated_capital: Optional[float] = None
     order_id: Optional[str] = None
     strategy_id: Optional[str] = None
     broker_order_id: Optional[str] = None  # BAT-003 / REQ-011 (trex-orbit lineage)
-    portfolio_id: Optional[str] = None  # BAT-006 / REQ-025 (trex-orbit lineage)
+    portfolio_id: Optional[str] = None  # BAT-006 / REQ-025; asset binding (REQ-056)
     sell_strategy_id: Optional[str] = None  # BAT-008 / REQ-047 (trex-orbit lineage)
     forced_close_at: Optional[datetime] = None  # BAT-014 / REQ-066 (trex-orbit lineage)
     stop_loss_price: Optional[Decimal] = None   # REQ-035 / BAT-010
     take_profit_price: Optional[Decimal] = None  # REQ-035 / BAT-010
-    # dcy-019 / REQ-002 (BAT-025): slot-scoped cumulative entry count. +1 on each
-    # allocation transition (idle/closed → pending_buy); drives admission slot
-    # selection (lowest entry_count first). Distinct from the symbol-scoped
-    # daily_symbol_entries counter (REQ-002 AC-3) — different key/purpose.
-    entry_count: int = 0
     created_at: Optional[datetime] = None
     updated_at: Optional[datetime] = None
-    # dcy-020 / REQ-056 (BAT-027): asset-centric permanent slot foundation (안 B).
-    # instance_key scopes slots per daemon instance in a shared DB
-    # (UNIQUE(instance_key, portfolio_id)); advisory lock is also instance-scoped.
-    # retired_at marks a soft-retired / universe-detached slot (OQ-2). Both added
-    # additively here; entry_count/trading_date removal is deferred to cutover (BAT-δ).
+    # dcy-020 / REQ-056: instance_key scopes slots per daemon instance in a
+    # shared DB (UNIQUE(instance_key, portfolio_id)); advisory lock is also
+    # instance-scoped. retired_at marks a soft-retired / universe-detached slot.
     instance_key: str = "default"
     retired_at: Optional[datetime] = None
 
@@ -61,7 +55,6 @@ class Slot:
 # / docs/data-model.md), not here — names/presence only.
 EXPECTED_SLOT_FIELDS: frozenset[str] = frozenset({
     "slot_id",
-    "trading_date",
     "status",
     "symbol",
     "qty",
@@ -76,7 +69,6 @@ EXPECTED_SLOT_FIELDS: frozenset[str] = frozenset({
     "forced_close_at",
     "stop_loss_price",    # REQ-035
     "take_profit_price",  # REQ-035
-    "entry_count",        # dcy-019 / REQ-002 (BAT-025)
     "created_at",
     "updated_at",
     "instance_key",       # dcy-020 / REQ-056 (BAT-027)
@@ -86,11 +78,20 @@ EXPECTED_SLOT_FIELDS: frozenset[str] = frozenset({
 
 @dataclass(frozen=True)
 class SlotCapacity:
-    """Snapshot of slot capacity returned by compute_slot_capacity (REQ-002 AC-6)."""
+    """Capacity snapshot returned by compute_slot_capacity (REQ-002 AC-6;
+    dcy-020/REQ-059 asset-centric redefinition, BAT-030).
 
-    idle_count: int
+    active_count = holding + pending (position-occupying). available_count is
+    the remaining admission headroom: max(0, M − active) under a max_active_slots
+    cap M, else the inactive (admittable) slot count. total_slots = M when set,
+    else the instance's slot count. scarcity_ratio = 1 − available/total.
+    """
+
+    inactive_count: int
     holding_count: int
     pending_count: int
+    active_count: int
+    available_count: int
     total_slots: int
     scarcity_ratio: float