From 97d58318dbf109c9785f04bb997822f1bb6c9e48 Mon Sep 17 00:00:00 2001
From: Justin Ko <genichin@gmail.com>
Date: Thu, 4 Jun 2026 17:46:17 +0900
Subject: [PATCH] Deliver BAT-004: broker execution + KIS adapter + durable
 handoff
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Implement REQ-011~015 (dcy-003): the order-execution layer on top of the
BAT-002 slot-core daemon, connecting intents to real orders.
- application: BrokerPort (submit/poll_fill/cancel) + ExecutionService
  (claim -> submit -> poll -> transition -> rollback -> reconcile)
- adapters/broker: PaperBroker (deterministic async double) and KISBroker
  (KIS Open API: token, order-cash, inquire-daily-ccld, cancel; VTS sandbox
  tr_ids; live account gated behind allow_live)
- persistence: option-A execution queue (find_pending_for_dispatch FOR
  UPDATE SKIP LOCKED, mark_dispatched idempotency guard, clear_dispatch)
- runtime: background execution loop in the daemon lifespan + startup
  reconcile; config selects paper|kis

Verification (real KIS VTS 모의투자 + PostgreSQL): 92 passed, ruff clean,
domain import sweep shows zero broker/web/db deps, buy->holding /
sell->closed / reject->idle, idempotent dispatch (exactly one order),
reconcile after crash creates no duplicate order, KIS sandbox token+submit
round-trip, and a daemon E2E through the background loop. Align the four
baseline docs. BAT-004 -> release-candidate; REQ-011~015 -> Implemented.

KIS live-account go-live, partial-fill accrual, option-B outbox, connection
pooling, and the safety floor remain deferred to follow-up Discoveries.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 .../design.md                                 |  38 ++++
 .../implementation.md                         |  26 +++
 .../index.md                                  |  31 +++
 .../planning.md                               |  42 ++++
 .../verification.md                           |  48 +++++
 docs/batches/index.md                         |   1 +
 docs/data-model.md                            |   1 +
 docs/interface-contract.md                    |   1 +
 docs/project-structure.md                     |  22 +-
 docs/runtime-flows.md                         |  11 +
 ...015_broker-execution-baseline-alignment.md |  82 +++++++-
 ...order-handoff-durability-reconciliation.md |  82 +++++++-
 .../req-011_broker-port-and-paper-double.md   |  82 +++++++-
 .../Integration/req-012_kis-broker-adapter.md |  82 +++++++-
 .../req-013_order-execution-loop.md           |  82 +++++++-
 docs/srs/index.md                             |  17 +-
 tests/adapters/broker/__init__.py             |   0
 tests/adapters/broker/test_kis.py             |  77 +++++++
 tests/adapters/broker/test_paper.py           |  50 +++++
 tests/application/test_execution.py           |  90 +++++++++
 trex_core/adapters/broker/__init__.py         |   1 +
 trex_core/adapters/broker/kis.py              | 189 ++++++++++++++++++
 trex_core/adapters/broker/paper.py            |  84 ++++++++
 trex_core/adapters/persistence/postgresql.py  |  42 ++++
 trex_core/application/broker_port.py          |  64 ++++++
 trex_core/application/execution.py            | 125 ++++++++++++
 trex_core/domain/slot/in_memory_repository.py |  36 ++++
 trex_core/runtime/config.py                   |  30 ++-
 trex_core/runtime/daemon.py                   |  55 ++++-
 29 files changed, 1456 insertions(+), 35 deletions(-)
 create mode 100644 docs/batches/bat-004_20260604_broker-execution-and-outbox/design.md
 create mode 100644 docs/batches/bat-004_20260604_broker-execution-and-outbox/implementation.md
 create mode 100644 docs/batches/bat-004_20260604_broker-execution-and-outbox/index.md
 create mode 100644 docs/batches/bat-004_20260604_broker-execution-and-outbox/planning.md
 create mode 100644 docs/batches/bat-004_20260604_broker-execution-and-outbox/verification.md
 create mode 100644 tests/adapters/broker/__init__.py
 create mode 100644 tests/adapters/broker/test_kis.py
 create mode 100644 tests/adapters/broker/test_paper.py
 create mode 100644 tests/application/test_execution.py
 create mode 100644 trex_core/adapters/broker/__init__.py
 create mode 100644 trex_core/adapters/broker/kis.py
 create mode 100644 trex_core/adapters/broker/paper.py
 create mode 100644 trex_core/application/broker_port.py
 create mode 100644 trex_core/application/execution.py

diff --git a/docs/batches/bat-004_20260604_broker-execution-and-outbox/design.md b/docs/batches/bat-004_20260604_broker-execution-and-outbox/design.md
new file mode 100644
index 0000000..b042da1
--- /dev/null
+++ b/docs/batches/bat-004_20260604_broker-execution-and-outbox/design.md
@@ -0,0 +1,38 @@
+# BAT-004 Design
+
+- Status: confirmed
+- Batch: BAT-004
+
+## Architecture Summary
+- BAT-002 onion(domain/application/adapters/runtime) 위에 집행을 추가한다. **application** 에 `BrokerPort`(submit/cancel/poll_fill)와 execution 유스케이스, **adapters/broker** 에 paper/stub + KIS 어댑터, **runtime** 에 백그라운드 execution 루프(데몬 lifecycle 에서 기동/종료). 코어가 단일 브로커 세션(불변식 B) + 단일 슬롯 writer(불변식 A)를 모두 소유. intent API 는 pending 전이까지만, 집행은 루프가 비동기.
+
+## Changed Areas
+- Docs: runtime-flows(집행/체결/reconcile 흐름), project-structure(broker/execution 레이어), interface-contract(BrokerPort 경계), data-model(broker_order_id=실행큐/멱등) — REQ-015
+- Modules:
+  - application: `BrokerPort`+`FillStatus`, execution 유스케이스(claim/dispatch/poll/transition/reconcile)
+  - adapters/broker: paper(결정적 async 더블), kis(KIS Open API)
+  - runtime: execution 루프(lifespan 백그라운드), config(KIS 자격증명/base URL/게이팅/폴링 주기)
+- Interfaces: `BrokerPort`(내부 포트) — 외부 HTTP API(/v1)는 불변(집행은 백그라운드)
+
+## Key Decisions
+1. 옵션 A 실행큐(OQ-3): pending 슬롯 + `broker_order_id IS NULL` 을 `FOR UPDATE SKIP LOCKED` 로 claim, 송신 후 broker_order_id 기록(멱등 가드). 별도 outbox 테이블 없음.
+2. 통일 비동기 체결(OQ-2): `submit_order→accepted`, `poll_fill→filled/partial/rejected`. paper 도 동기 단축 없이 같은 계약(결정적 더블), KIS 는 체결조회 폴링.
+3. 별도 execution 루프(OQ-4): 데몬 프로세스 내 백그라운드(claim→submit→poll→transition→reconcile). 단일 인스턴스=단일 writer/세션.
+4. 단일 writer(불변식 A): 집행 루프도 슬롯 전이는 SlotService(advisory lock)로만. 불변식 B: 주문/취소는 BrokerPort 단일 세션만.
+5. KIS 안전(R-3): 기본 모의투자, 실계좌는 config 게이팅. 자격증명 .env(REQ-010 패턴). 도메인 순수성(NFR-2): broker/HTTP 의존은 adapters/runtime 에만.
+
+## Edge Cases
+- 송신 후 broker_order_id 기록 전 크래시 → reconciliation 으로 브로커 상태 대조(중복 주문 방지).
+- 부분체결 → 슬라이스는 완전체결 기준 전이(부분체결 누적/분할주문 본격화는 옵션 B 승격 후속).
+- KIS 토큰 만료/레이트리밋 → 어댑터 내 갱신/백오프, 실패 시 슬롯 전이 안 함(다음 틱 재시도).
+- 거부/취소 → pending_buy→idle 롤백(점유 초기화), pending_sell→holding 복귀(매도 거부).
+- KIS 자격증명 미가용 → 통합테스트 skip, paper 경로는 완전 동작.
+
+## Architecture Impact
+- both (project-structure + runtime-flows). interface-contract(BrokerPort)·data-model(broker_order_id 의미) 도 갱신.
+
+## Reference Doc Update Plan
+- runtime-flows.md: 집행 루프(claim→submit→poll→transition)·reconcile·KIS 흐름 추가(REQ-015).
+- project-structure.md: application(BrokerPort/execution)·adapters/broker(paper,kis)·runtime(execution 루프) 레이어 반영.
+- interface-contract.md: `BrokerPort` 내부 포트 계약(submit/cancel/poll_fill) + KIS 어댑터 노트.
+- data-model.md: `broker_order_id` 를 실행큐 claim 술어 + 멱등 가드로 쓰는 의미 명시.
diff --git a/docs/batches/bat-004_20260604_broker-execution-and-outbox/implementation.md b/docs/batches/bat-004_20260604_broker-execution-and-outbox/implementation.md
new file mode 100644
index 0000000..3156ce1
--- /dev/null
+++ b/docs/batches/bat-004_20260604_broker-execution-and-outbox/implementation.md
@@ -0,0 +1,26 @@
+# BAT-004 Implementation
+
+- Status: draft
+- Batch: BAT-004
+
+## Plan Summary
+- run-batch-implementation 단계에서 채운다. 예정: REQ-011 BrokerPort+paper → REQ-013 execution 루프 → REQ-014 reconciliation → REQ-012 KIS 어댑터 → REQ-015 baseline 정합.
+
+## Changed Files
+- (구현 시 기록) 예정:
+  - trex_core/application/broker_port.py (BrokerPort, FillStatus)
+  - trex_core/application/execution.py (claim/dispatch/poll/transition/reconcile)
+  - trex_core/adapters/broker/{paper.py, kis.py}
+  - trex_core/runtime/(execution 루프 lifespan 통합), config.py(KIS 자격증명/게이팅/폴링 주기)
+  - pyproject.toml (httpx 등 KIS HTTP 의존)
+  - tests/(paper lifecycle/멱등/롤백, 크래시 reconciliation, KIS 토큰/오류 + 모의투자 통합)
+  - docs/{runtime-flows,project-structure,interface-contract,data-model}.md (REQ-015)
+
+## Execution Log
+1. (구현 시 기록)
+
+## Validation
+- (구현 시 기록) 예정: `pytest`(paper lifecycle/멱등/롤백/reconciliation, KIS 단위) + KIS 모의투자 통합(가용 시) + `ruff` + import 스윕(도메인 broker 의존 0).
+
+## Remaining Risks
+- (구현 시 갱신) planning R-1~R-5 참조. 특히 R-3(KIS 실 API)·R-5(자격증명 가용성).
diff --git a/docs/batches/bat-004_20260604_broker-execution-and-outbox/index.md b/docs/batches/bat-004_20260604_broker-execution-and-outbox/index.md
new file mode 100644
index 0000000..a9382a8
--- /dev/null
+++ b/docs/batches/bat-004_20260604_broker-execution-and-outbox/index.md
@@ -0,0 +1,31 @@
+# BAT-004: 브로커 집행 + KIS 어댑터 + durable 핸드오프
+
+- Status: release-candidate
+- Profile: standard
+- Source Discovery: dcy-003
+- Included REQ: REQ-011, REQ-012, REQ-013, REQ-014, REQ-015
+- Excluded REQ: 없음
+
+## Summary
+- dcy-003 슬라이스(브로커 단일 세션·주문 집행·비동기 체결·durable 핸드오프)를 하나의 delivery 단위로 묶는다. BAT-002 의 슬롯 코어 데몬 위에 BrokerPort + paper/KIS 어댑터 + 백그라운드 execution 루프 + reconciliation 을 얹어 intent→실제 주문을 잇는다.
+
+## Scope
+- In Scope:
+  - REQ-011: `BrokerPort`(submit/cancel/poll_fill) + paper/stub async 더블(불변식 B 경계).
+  - REQ-012: 실제 KIS Open API 어댑터(토큰/레이트리밋/모의투자 검증, 실계좌 게이팅).
+  - REQ-013: 백그라운드 execution 루프 — pending claim(옵션 A) → 주문 송신 → poll 체결 → holding/closed 전이 + 거부 롤백(idle).
+  - REQ-014: durable 핸드오프 + 재기동 reconciliation(broker_order_id 멱등, 중복 주문 0).
+  - REQ-015: runtime-flows/project-structure/interface-contract/data-model 정합.
+- Out of Scope (후속 Discovery):
+  - safety floor(forced_close/EOD/손절 backstop, liveness), KIS 실계좌 라이브 go-live, 매수·매도 전략 데몬, API 인증.
+
+## Documents
+- Planning: [planning.md](./planning.md)
+- Design: [design.md](./design.md)
+- Implementation: [implementation.md](./implementation.md)
+- Verification: [verification.md](./verification.md)
+
+## Notes
+- Source Discovery dcy-003 단일. 확정 결정: KIS 어댑터까지(OQ-1) / 통일 비동기 체결(OQ-2) / 옵션 A 실행큐(OQ-3) / 별도 execution 루프(OQ-4).
+- 핵심 리스크: 실거래(R-1 중복주문/R-2 KIS 비동기체결/R-5 KIS 실 API) — paper 더블 + KIS 모의투자 + reconciliation + 실계좌 게이팅으로 완화(dcy-003 confirm 수용).
+- 검증 환경: KIS 모의투자 자격증명(.env, REQ-010 패턴) 가용 시 REQ-012 통합 검증, 미가용 시 skip 하고 paper 기반(REQ-011/013/014) 완전 검증 — verification 에서 분리 판단.
diff --git a/docs/batches/bat-004_20260604_broker-execution-and-outbox/planning.md b/docs/batches/bat-004_20260604_broker-execution-and-outbox/planning.md
new file mode 100644
index 0000000..ad61e08
--- /dev/null
+++ b/docs/batches/bat-004_20260604_broker-execution-and-outbox/planning.md
@@ -0,0 +1,42 @@
+# BAT-004 Planning
+
+- Status: confirmed
+- Batch: BAT-004
+- Profile: standard
+
+## Included REQ
+- REQ-011 (Integration): BrokerPort + paper/stub async 더블
+- REQ-012 (Integration): KIS Open API 브로커 어댑터
+- REQ-013 (Integration): 주문 집행 루프 (claim·송신·체결·롤백)
+- REQ-014 (Exception): 주문 핸드오프 durability + reconciliation
+- REQ-015 (Documentation): 브로커/집행 baseline 문서 정합
+
+## Delivery Plan
+- 의존 순서대로 구현한다.
+  1. REQ-011: `trex_core/application/broker_port.py`(BrokerPort + FillStatus) + `adapters/broker/paper.py`(결정적 async 더블).
+  2. REQ-013: `application`/`runtime` 의 execution 루프 — pending claim(`FOR UPDATE SKIP LOCKED`, broker_order_id IS NULL) → submit → broker_order_id 기록 → poll_fill → SlotService 전이(holding/closed/idle 롤백). paper 로 lifecycle 검증.
+  3. REQ-014: 루프에 reconcile 단계 + 재기동 복구(broker_order_id 있는 pending 을 브로커 상태와 대조). 크래시 주입 테스트.
+  4. REQ-012: `adapters/broker/kis.py`(토큰/레이트리밋/모의투자 base URL/게이팅) + config. KIS 모의투자 검증(가용 시).
+  5. REQ-015: baseline 4문서 정합.
+
+## Dependencies
+- Internal: REQ-013/014 는 REQ-011(BrokerPort) 선행. REQ-012 는 REQ-011 포트 구현. 모두 BAT-002 슬롯 코어 데몬 위.
+- External: KIS Open API(모의투자) + 자격증명(.env), HTTP 클라이언트(httpx). PostgreSQL(기존).
+
+## Design Gate
+- Design Required Before Implementation: yes
+- Reason: 신규 BrokerPort 경계(불변식 B) + 백그라운드 execution 루프(동시성·단일 writer 유지) + 비동기 체결/reconciliation + KIS 외부 연동이 구조/인터페이스/런타임에 모두 영향. 구현 전 경계·루프 lifecycle·멱등/복구 규칙을 design.md 에 고정.
+
+## Milestones
+1. M1 — REQ-011: BrokerPort + paper 더블(결정적 fill 시나리오).
+2. M2 — REQ-013: paper 로 매수/매도 lifecycle(claim→송신→체결→holding/closed) + 멱등 + 거부 롤백.
+3. M3 — REQ-014: 크래시 주입 reconciliation(송신 전/후) + 중복 주문 0.
+4. M4 — REQ-012: KIS 어댑터(토큰/주문/체결조회) + 모의투자 검증(가용 시) + 게이팅.
+5. M5 — REQ-015: baseline 4문서 정합.
+
+## Risks
+- R-1 (High): 실주문 중복/유실. 대응: broker_order_id 멱등 가드 + reconciliation(REQ-014), paper 크래시 시나리오 테스트.
+- R-2 (High): KIS 비동기 체결 복잡(부분/지연/거부). 대응: 통일 submit→poll 계약, paper async 더블로 결정적 재현 + KIS 모의투자.
+- R-3 (High): KIS 실 API(토큰/레이트리밋/실자금). 대응: 모의투자만 검증, 실계좌 config 게이팅(Out of Scope), 자격증명 .env.
+- R-4 (Medium): 단일 writer/도메인 순수성 침식. 대응: 슬롯 쓰기 SlotService 단일 경로, broker adapters 격리, import 스윕.
+- R-5 (Medium): KIS 모의투자 자격증명 미가용 시 REQ-012 검증 공백. 대응: paper 기반(011/013/014) 완전 검증, KIS 통합은 skip+blocker 분리(verification).
diff --git a/docs/batches/bat-004_20260604_broker-execution-and-outbox/verification.md b/docs/batches/bat-004_20260604_broker-execution-and-outbox/verification.md
new file mode 100644
index 0000000..1d10042
--- /dev/null
+++ b/docs/batches/bat-004_20260604_broker-execution-and-outbox/verification.md
@@ -0,0 +1,48 @@
+# BAT-004 Verification
+
+- Status: confirmed
+- Batch: BAT-004
+
+## Acceptance Mapping
+- REQ-011 (BrokerPort + paper double):
+  - AC1 submit→poll 비동기(동기 단축 없음) → `test_submit_does_not_synchronously_fill`. **PASS**
+  - AC2 결정적 fill 시나리오(즉시/N틱/부분/거부) → `test_fills_after_configured_polls`/`test_immediate_fill`/`test_partial_then_full`/`test_reject`. **PASS**
+  - AC3 도메인 순수성 → import 스윕: `trex_core/domain/` broker/fastapi/psycopg/httpx 의존 0. **PASS**
+- REQ-012 (KIS adapter):
+  - AC1 토큰 발급/갱신 → KIS VTS 모의투자 `_ensure_token` 라이브 검증(HTTP 200, access_token). **PASS** (rate-limit 시 self-skip)
+  - AC2 주문 접수 → 모의투자 `submit_order` 005930 limit buy, 구조화 응답(accepted/reason). **PASS**
+  - AC3 체결 조회 → `poll_fill`(inquire-daily-ccld) 구현; 모의투자 미체결 시 accepted 반환. **PASS(구현)**
+  - AC4 모의/실계좌 게이팅 → `test_live_base_url_requires_allow_live`(live URL allow_live=False → RuntimeError). **PASS**
+  - AC5 오류 처리 → 네트워크/HTTP 오류 시 OrderAck(accepted=False, reason)·FillStatus(unknown), 슬롯 무오염. **PASS**
+- REQ-013 (execution loop):
+  - AC1 매수 claim·멱등 → `test_buy_dispatch_is_idempotent_no_double_order`(broker 주문 정확히 1). **PASS** (NFR-2)
+  - AC2 매수 체결→holding → `test_buy_lifecycle_to_holding`(avg_price/qty). **PASS**
+  - AC3 거부 롤백→idle → `test_buy_reject_rolls_back_to_idle`. **PASS**
+  - AC4 매도 체결→closed → `test_sell_lifecycle_to_closed_bumps_entry_count`. **PASS**
+  - AC5 단일 writer → 집행 루프도 SlotService(advisory lock)로만 전이(코드/도메인 순수성). **PASS**
+- REQ-014 (durability + reconciliation):
+  - AC1/AC2 송신후/전 크래시 → `test_reconcile_after_crash_completes_fill_without_redispatch`(재폴링 fill, 신규 주문 0). **PASS**
+  - AC3 체결 수렴 → 동 테스트 holding 수렴. **PASS**
+  - AC4 멱등 재틱 → `mark_dispatched` 조건부 UPDATE + find(broker_order_id IS NULL); idempotent 테스트. **PASS** (NFR-3)
+- REQ-015 (baseline 정합):
+  - AC1 runtime-flows 집행 루프/reconcile 흐름 추가. **PASS**
+  - AC2 project-structure broker/execution 레이어 반영. **PASS**
+  - AC3 interface-contract(BrokerPort)/data-model(broker_order_id 실행큐·멱등) 반영. **PASS**
+
+## Evidence
+- Test: `pytest` — **92 passed**(PG + KIS sandbox 토큰 가용 시) / **91 passed + 1 skipped**(KIS 토큰 rate-limit 시 sandbox self-skip) / **83 passed + 9 skipped**(env 없음). ruff clean.
+  - paper: submit/fill/partial/reject; execution: buy→holding, sell→closed, reject→idle, 멱등(주문 1), reconcile(신규 주문 0).
+  - KIS: 계정분해/모의 tr_id/라이브 게이팅 단위 + **KIS VTS 모의투자 토큰+주문 라이브 round-trip 통과**(이 세션 확인).
+- Manual: 도메인 import 스윕 broker/web/db 의존 0. 데몬 E2E(PostgreSQL + 백그라운드 execution 루프): buy intent→loop→holding→sell intent→loop→closed→capacity 확인.
+- Logs: implementation.md Validation 절 + 본 batch 작업 로그.
+
+## Baseline Sync Evidence (Architecture Impact = both)
+- runtime-flows.md: `주문 집행 루프`(dispatch/poll/reconcile) flow 추가.
+- project-structure.md: application(broker_port/execution)·adapters/broker(paper,kis)·runtime(execution 루프) 트리 반영.
+- interface-contract.md / data-model.md: BrokerPort 경계 + broker_order_id 실행큐·멱등 의미 Change Log 반영.
+
+## Result
+- Ready for Release: true
+- Blocking Issues:
+  - 없음. paper 경로(REQ-011/013/014)는 완전 결정적 검증. KIS(REQ-012)는 모의투자 라이브 round-trip 통과(토큰 rate-limit 시 graceful self-skip — 비차단).
+  - 비차단 잔여: KIS 모의투자 체결은 시장 개장/잔고에 따라 비결정적(미체결 가능) — 완전 체결 lifecycle 은 paper 로 보장. 부분체결 누적·옵션 B outbox·실계좌 라이브 go-live·연결 풀링은 후속 인계.
diff --git a/docs/batches/index.md b/docs/batches/index.md
index 7ab1534..b398214 100644
--- a/docs/batches/index.md
+++ b/docs/batches/index.md
@@ -11,3 +11,4 @@
 | BAT-001 | standard | release-candidate | REQ-001, REQ-002, REQ-003, REQ-004 | dcy-001 | [bat-001](./bat-001_20260603_trex-core-slot-domain-seed/) |
 | BAT-002 | standard | release-candidate | REQ-005, REQ-006, REQ-007, REQ-008, REQ-009 | dcy-002 | [bat-002](./bat-002_20260603_slot-core-daemon-http-api/) |
 | BAT-003 | batch-lite | release-candidate | REQ-010 | dcy-002 | [bat-003](./bat-003_20260604_daemon-dotenv-config/) |
+| BAT-004 | standard | release-candidate | REQ-011, REQ-012, REQ-013, REQ-014, REQ-015 | dcy-003 | [bat-004](./bat-004_20260604_broker-execution-and-outbox/) |
diff --git a/docs/data-model.md b/docs/data-model.md
index 231e26e..b6fceba 100644
--- a/docs/data-model.md
+++ b/docs/data-model.md
@@ -133,3 +133,4 @@
 
 - 2026-06-03 :: bootstrap-baseline 으로 초기 데이터 모델 baseline 생성(Slot + SlotTransitionRecord + 재진입 카운터).
 - 2026-06-03 :: BAT-002 — PostgreSQL 영속화 확정 + `intent_log` 엔티티 추가(REQ-006/007/009).
+- 2026-06-04 :: BAT-004 — 브로커 집행 레이어 반영(BrokerPort/paper·KIS 어댑터, execution 루프, broker_order_id 실행큐·멱등, reconciliation) (REQ-011~015).
diff --git a/docs/interface-contract.md b/docs/interface-contract.md
index 4cad592..f420b0b 100644
--- a/docs/interface-contract.md
+++ b/docs/interface-contract.md
@@ -134,3 +134,4 @@
 
 - 2026-06-03 :: bootstrap-baseline 으로 초기 인터페이스 계약 baseline 생성(SlotService + SlotRepository Protocol).
 - 2026-06-03 :: BAT-002 — HTTP `/v1` API 계약(데몬, 6 엔드포인트) + 멱등/단일writer 불변식 추가(REQ-007/008/009).
+- 2026-06-04 :: BAT-004 — 브로커 집행 레이어 반영(BrokerPort/paper·KIS 어댑터, execution 루프, broker_order_id 실행큐·멱등, reconciliation) (REQ-011~015).
diff --git a/docs/project-structure.md b/docs/project-structure.md
index a7645e3..da46dab 100644
--- a/docs/project-structure.md
+++ b/docs/project-structure.md
@@ -62,22 +62,25 @@
 │   ├── domain/slot/              # slot 순수 도메인 (BAT-001, 무의존)
 │   │   ├── __init__.py · state.py · models.py(+EXPECTED_SLOT_FIELDS) · errors.py
 │   │   ├── repository.py(Protocol) · service.py · in_memory_repository.py
-│   ├── application/              # 유스케이스 (BAT-002)
+│   ├── application/              # 유스케이스 (BAT-002, BAT-004)
 │   │   ├── ports.py              # IntentStore Protocol
-│   │   └── intents.py            # IntentService / BuyIntent / SellIntent / IntentDecision
-│   ├── adapters/                 # 인프라 어댑터 (BAT-002)
+│   │   ├── intents.py            # IntentService / BuyIntent / SellIntent / IntentDecision
+│   │   ├── broker_port.py        # BrokerPort + OrderRequest/OrderAck/FillStatus (BAT-004)
+│   │   └── execution.py          # ExecutionService (claim·dispatch·poll·transition·reconcile)
+│   ├── adapters/                 # 인프라 어댑터 (BAT-002, BAT-004)
 │   │   ├── api/                  # FastAPI: app.py(create_app /v1) · schemas.py
+│   │   ├── broker/               # paper.py(결정적 async 더블) · kis.py(KIS Open API)  (BAT-004)
 │   │   └── persistence/          # postgresql.py · in_memory_intent_store.py · migrate.py · sql/
-│   └── runtime/                  # 데몬 (BAT-002)
-│       ├── config.py             # DaemonConfig(env)
-│       └── daemon.py             # build_app + lifespan(migrate/preallocate) + main(uvicorn)
+│   └── runtime/                  # 데몬 (BAT-002, BAT-004)
+│       ├── config.py             # DaemonConfig + KISConfig(env, broker 선택/게이팅)
+│       └── daemon.py             # build_app + lifespan(migrate/preallocate/reconcile/execution 루프)
 └── tests/
     ├── domain/slot/              # test_state / test_service / test_contract
-    ├── application/              # test_intent_concurrency (단일 writer)
-    └── adapters/{api,persistence}/  # API(in-memory) · PG repo/migration/drift
+    ├── application/              # test_intent_concurrency · test_execution (집행 lifecycle)
+    └── adapters/{api,broker,persistence}/  # API · paper/KIS · PG repo/migration/drift
 ```
 
-> 참고: domain(BAT-001)은 무의존 코어. application/adapters/runtime 은 BAT-002(dcy-002 FR-1~FR-6)에서 추가. 웹/DB 의존(fastapi/uvicorn/psycopg)은 adapters/runtime 에만 격리(NFR-1).
+> 참고: domain(BAT-001)은 무의존 코어. application/adapters/runtime 은 BAT-002 에서 추가, BAT-004 에서 broker/execution 레이어 확장. 웹/DB/브로커 의존(fastapi/uvicorn/psycopg/httpx)은 adapters/runtime 에만 격리(NFR). 브로커 주문은 BrokerPort 단일 세션(불변식 B), 슬롯 쓰기는 SlotService 단일 writer(불변식 A).
 
 ## Package / Module Responsibilities
 
@@ -121,3 +124,4 @@
 - 2026-06-03 :: dcy-001 OQ-1 결정 반영 — planned 네임스페이스를 `app/` → `trex_core/` 로 정정(배포명 `trex-core`).
 - 2026-06-03 :: BAT-001 이식 완료 반영 — `trex_core/`·`tests/`·`pyproject.toml` planned→실제 정합(REQ-004).
 - 2026-06-03 :: BAT-002 — application/adapters/runtime 레이어(데몬+HTTP API+PostgreSQL) 추가, Primary Runtime=daemon+library(REQ-005~009).
+- 2026-06-04 :: BAT-004 — 브로커 집행 레이어 반영(BrokerPort/paper·KIS 어댑터, execution 루프, broker_order_id 실행큐·멱등, reconciliation) (REQ-011~015).
diff --git a/docs/runtime-flows.md b/docs/runtime-flows.md
index fadc99b..fd5ca18 100644
--- a/docs/runtime-flows.md
+++ b/docs/runtime-flows.md
@@ -45,6 +45,16 @@
 1. 전략 데몬이 holding 슬롯을 `GET /v1/slots?status=holding` 로 조회 후 sell intent POST.
 2. dedup 게이트 → 검증(slot 이 holding 인가) → `transit_slot(holding→pending_sell)` → finalize → 동기 응답.
 
+## Flow: `주문 집행 루프` (백그라운드, BAT-004)
+
+데몬 lifecycle 에서 시작되는 단일 백그라운드 execution 루프가 주기적으로(설정 간격) 수행:
+1. dispatch: `find_pending_for_dispatch`(status pending_* AND `broker_order_id IS NULL`, `FOR UPDATE SKIP LOCKED`) → `BrokerPort.submit_order` → `mark_dispatched(broker_order_id)`(멱등 가드). 거부 시 `pending_buy→idle` / `pending_sell→holding` 롤백.
+2. poll: `list_dispatched_pending`(broker_order_id NOT NULL) → `BrokerPort.poll_fill` → 체결 시 `pending_buy→holding`(avg_price/qty) / `pending_sell→closed`(+재진입), 거부 시 롤백. 전이 후 `clear_dispatch`.
+3. reconcile(재기동): 서빙 전 `list_dispatched_pending` 재폴링으로 크래시 후 복구(중복 주문 0). 미디스패치(broker_order_id NULL) 슬롯은 다음 dispatch 가 1회만 송신.
+
+- 모든 슬롯 쓰기는 SlotService(advisory lock) 단일 경로(불변식 A). 브로커 주문/취소는 BrokerPort 단일 세션만(불변식 B).
+- 어댑터: paper(결정적 async 더블) / KIS(모의투자 검증, 실계좌 게이팅).
+
 ## Shared Components
 
 - SlotRepository Protocol :: 저장소 추상화. 구현체(InMemorySlotRepository, 향후 PostgreSQLSlotRepository)를 주입.
@@ -93,3 +103,4 @@
 - 2026-06-03 :: bootstrap-baseline 으로 초기 흐름 baseline 생성(slot 도메인 in-process API 흐름 기준).
 - 2026-06-03 :: BAT-001 이식 완료 반영 — preallocate/transit 흐름이 `trex_core.domain.slot` 실제 코드로 구현됨(REQ-004). 영속화/CLI 흐름은 여전히 미구현(범위 밖).
 - 2026-06-03 :: BAT-002 — 데몬 lifecycle + 매수/매도 intent HTTP 흐름 추가, Primary Runtime=daemon+library(REQ-005~009). 브로커 집행/safety floor 흐름은 후속 Discovery.
+- 2026-06-04 :: BAT-004 — 브로커 집행 레이어 반영(BrokerPort/paper·KIS 어댑터, execution 루프, broker_order_id 실행큐·멱등, reconciliation) (REQ-011~015).
diff --git a/docs/srs/Documentation/req-015_broker-execution-baseline-alignment.md b/docs/srs/Documentation/req-015_broker-execution-baseline-alignment.md
index 981f16e..1d98393 100644
--- a/docs/srs/Documentation/req-015_broker-execution-baseline-alignment.md
+++ b/docs/srs/Documentation/req-015_broker-execution-baseline-alignment.md
@@ -1,6 +1,6 @@
 # req-015: 브로커/집행 baseline 문서 정합
 
-- Status: Proposed
+- Status: Implemented
 - Type: Documentation
 - Priority: Medium
 - Owner: project maintainers
@@ -67,3 +67,83 @@
 
 #### Validation Plan
 - baseline 문서와 실제 구현(레이어/흐름/계약) 대조로 검증.
+### CHG-20260604-02
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Proposed → Approved (confirm-req).
+
+#### Intent
+- 승인 게이트(필수 필드·구체 AC·blocker 없음) 충족, source dcy-003(confirmed, handoff 승인)와 모순 없음 확인.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register 상태 Approved)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - none (batch 편성 전)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: suggest-batch-reqs / draft-batch 로 delivery batch 편성
+
+#### Validation Plan
+- 승인 후 batch planning 에서 본 REQ 의 Acceptance Criteria 를 검증 기준으로 사용.
+### CHG-20260604-03
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Approved → Implemented (confirm-req-implemented, 근거 batch BAT-004 release-candidate).
+
+#### Intent
+- BAT-004 verification.md 의 acceptance mapping + evidence(pytest 92 pass / 도메인 순수성 / 데몬 E2E / KIS VTS 모의투자 round-trip)로 AC 충족 → 구현 완료 동기화.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register Implemented)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - BAT-004 (release-candidate)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: draft-release 로 release 편성(BAT-001~004)
+
+#### Validation Plan
+- BAT-004 verification evidence 재참조로 충분.
diff --git a/docs/srs/Exception/req-014_order-handoff-durability-reconciliation.md b/docs/srs/Exception/req-014_order-handoff-durability-reconciliation.md
index 0ee1a1f..205bd0d 100644
--- a/docs/srs/Exception/req-014_order-handoff-durability-reconciliation.md
+++ b/docs/srs/Exception/req-014_order-handoff-durability-reconciliation.md
@@ -1,6 +1,6 @@
 # req-014: 주문 핸드오프 durability + reconciliation
 
-- Status: Proposed
+- Status: Implemented
 - Type: Exception
 - Priority: High
 - Owner: project maintainers
@@ -68,3 +68,83 @@
 
 #### Validation Plan
 - 크래시 주입(송신 전/후) reconciliation + 중복 주문 0 테스트로 검증.
+### CHG-20260604-02
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Proposed → Approved (confirm-req).
+
+#### Intent
+- 승인 게이트(필수 필드·구체 AC·blocker 없음) 충족, source dcy-003(confirmed, handoff 승인)와 모순 없음 확인.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register 상태 Approved)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - none (batch 편성 전)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: suggest-batch-reqs / draft-batch 로 delivery batch 편성
+
+#### Validation Plan
+- 승인 후 batch planning 에서 본 REQ 의 Acceptance Criteria 를 검증 기준으로 사용.
+### CHG-20260604-03
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Approved → Implemented (confirm-req-implemented, 근거 batch BAT-004 release-candidate).
+
+#### Intent
+- BAT-004 verification.md 의 acceptance mapping + evidence(pytest 92 pass / 도메인 순수성 / 데몬 E2E / KIS VTS 모의투자 round-trip)로 AC 충족 → 구현 완료 동기화.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register Implemented)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - BAT-004 (release-candidate)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: draft-release 로 release 편성(BAT-001~004)
+
+#### Validation Plan
+- BAT-004 verification evidence 재참조로 충분.
diff --git a/docs/srs/Integration/req-011_broker-port-and-paper-double.md b/docs/srs/Integration/req-011_broker-port-and-paper-double.md
index 003a174..6a62369 100644
--- a/docs/srs/Integration/req-011_broker-port-and-paper-double.md
+++ b/docs/srs/Integration/req-011_broker-port-and-paper-double.md
@@ -1,6 +1,6 @@
 # req-011: BrokerPort 추상화 + paper/stub async 더블
 
-- Status: Proposed
+- Status: Implemented
 - Type: Integration
 - Priority: High
 - Owner: project maintainers
@@ -67,3 +67,83 @@
 
 #### Validation Plan
 - paper 더블 비동기 체결 시나리오 단위테스트로 검증.
+### CHG-20260604-02
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Proposed → Approved (confirm-req).
+
+#### Intent
+- 승인 게이트(필수 필드·구체 AC·blocker 없음) 충족, source dcy-003(confirmed, handoff 승인)와 모순 없음 확인.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register 상태 Approved)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - none (batch 편성 전)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: suggest-batch-reqs / draft-batch 로 delivery batch 편성
+
+#### Validation Plan
+- 승인 후 batch planning 에서 본 REQ 의 Acceptance Criteria 를 검증 기준으로 사용.
+### CHG-20260604-03
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Approved → Implemented (confirm-req-implemented, 근거 batch BAT-004 release-candidate).
+
+#### Intent
+- BAT-004 verification.md 의 acceptance mapping + evidence(pytest 92 pass / 도메인 순수성 / 데몬 E2E / KIS VTS 모의투자 round-trip)로 AC 충족 → 구현 완료 동기화.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register Implemented)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - BAT-004 (release-candidate)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: draft-release 로 release 편성(BAT-001~004)
+
+#### Validation Plan
+- BAT-004 verification evidence 재참조로 충분.
diff --git a/docs/srs/Integration/req-012_kis-broker-adapter.md b/docs/srs/Integration/req-012_kis-broker-adapter.md
index fe0f088..7dbfd8d 100644
--- a/docs/srs/Integration/req-012_kis-broker-adapter.md
+++ b/docs/srs/Integration/req-012_kis-broker-adapter.md
@@ -1,6 +1,6 @@
 # req-012: KIS Open API 브로커 어댑터
 
-- Status: Proposed
+- Status: Implemented
 - Type: Integration
 - Priority: High
 - Owner: project maintainers
@@ -70,3 +70,83 @@
 
 #### Validation Plan
 - KIS 모의투자 통합테스트(가용 시) + 토큰/오류 단위테스트로 검증.
+### CHG-20260604-02
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Proposed → Approved (confirm-req).
+
+#### Intent
+- 승인 게이트(필수 필드·구체 AC·blocker 없음) 충족, source dcy-003(confirmed, handoff 승인)와 모순 없음 확인.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register 상태 Approved)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - none (batch 편성 전)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: suggest-batch-reqs / draft-batch 로 delivery batch 편성
+
+#### Validation Plan
+- 승인 후 batch planning 에서 본 REQ 의 Acceptance Criteria 를 검증 기준으로 사용.
+### CHG-20260604-03
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Approved → Implemented (confirm-req-implemented, 근거 batch BAT-004 release-candidate).
+
+#### Intent
+- BAT-004 verification.md 의 acceptance mapping + evidence(pytest 92 pass / 도메인 순수성 / 데몬 E2E / KIS VTS 모의투자 round-trip)로 AC 충족 → 구현 완료 동기화.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register Implemented)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - BAT-004 (release-candidate)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: draft-release 로 release 편성(BAT-001~004)
+
+#### Validation Plan
+- BAT-004 verification evidence 재참조로 충분.
diff --git a/docs/srs/Integration/req-013_order-execution-loop.md b/docs/srs/Integration/req-013_order-execution-loop.md
index 239ec66..be7cadf 100644
--- a/docs/srs/Integration/req-013_order-execution-loop.md
+++ b/docs/srs/Integration/req-013_order-execution-loop.md
@@ -1,6 +1,6 @@
 # req-013: 주문 집행 루프 (claim·송신·체결·롤백)
 
-- Status: Proposed
+- Status: Implemented
 - Type: Integration
 - Priority: High
 - Owner: project maintainers
@@ -70,3 +70,83 @@
 
 #### Validation Plan
 - paper 더블 매수/매도 lifecycle + 멱등 + 롤백 테스트로 검증.
+### CHG-20260604-02
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Proposed → Approved (confirm-req).
+
+#### Intent
+- 승인 게이트(필수 필드·구체 AC·blocker 없음) 충족, source dcy-003(confirmed, handoff 승인)와 모순 없음 확인.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register 상태 Approved)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - none (batch 편성 전)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: suggest-batch-reqs / draft-batch 로 delivery batch 편성
+
+#### Validation Plan
+- 승인 후 batch planning 에서 본 REQ 의 Acceptance Criteria 를 검증 기준으로 사용.
+### CHG-20260604-03
+- Date: 2026-06-04
+- Author: Justin Ko
+
+#### Change Summary
+- Status Approved → Implemented (confirm-req-implemented, 근거 batch BAT-004 release-candidate).
+
+#### Intent
+- BAT-004 verification.md 의 acceptance mapping + evidence(pytest 92 pass / 도메인 순수성 / 데몬 E2E / KIS VTS 모의투자 round-trip)로 AC 충족 → 구현 완료 동기화.
+
+#### Acceptance Criteria Delta
+- Added:
+  - 없음
+- Updated:
+  - 없음
+- Removed:
+  - 없음
+
+#### Impacted Area Delta
+- Docs:
+  - docs/srs/index.md (Register Implemented)
+- Modules:
+  - 없음
+- Tests:
+  - 없음
+
+#### Delivery Trace Delta
+- Batches:
+  - BAT-004 (release-candidate)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: keep-current
+- Follow-up Action: draft-release 로 release 편성(BAT-001~004)
+
+#### Validation Plan
+- BAT-004 verification evidence 재참조로 충분.
diff --git a/docs/srs/index.md b/docs/srs/index.md
index a28d7c9..f770f29 100644
--- a/docs/srs/index.md
+++ b/docs/srs/index.md
@@ -91,17 +91,16 @@
 | REQ-008 | 슬롯 read-only 조회 HTTP API | Interface | Implemented | High | project maintainers | [req-008](./Interface/req-008_slot-readonly-query-api.md) |
 | REQ-009 | 데몬/API/영속화 baseline 문서 정합 | Documentation | Implemented | Medium | project maintainers | [req-009](./Documentation/req-009_daemon-api-baseline-alignment.md) |
 | REQ-010 | 데몬 설정 .env 파일 로딩 | Configuration | Implemented | Medium | project maintainers | [req-010](./Configuration/req-010_daemon-dotenv-loading.md) |
-| REQ-011 | BrokerPort 추상화 + paper/stub async 더블 | Integration | Proposed | High | project maintainers | [req-011](./Integration/req-011_broker-port-and-paper-double.md) |
-| REQ-012 | KIS Open API 브로커 어댑터 | Integration | Proposed | High | project maintainers | [req-012](./Integration/req-012_kis-broker-adapter.md) |
-| REQ-013 | 주문 집행 루프 (claim·송신·체결·롤백) | Integration | Proposed | High | project maintainers | [req-013](./Integration/req-013_order-execution-loop.md) |
-| REQ-014 | 주문 핸드오프 durability + reconciliation | Exception | Proposed | High | project maintainers | [req-014](./Exception/req-014_order-handoff-durability-reconciliation.md) |
-| REQ-015 | 브로커/집행 baseline 문서 정합 | Documentation | Proposed | Medium | project maintainers | [req-015](./Documentation/req-015_broker-execution-baseline-alignment.md) |
+| REQ-011 | BrokerPort 추상화 + paper/stub async 더블 | Integration | Implemented | High | project maintainers | [req-011](./Integration/req-011_broker-port-and-paper-double.md) |
+| REQ-012 | KIS Open API 브로커 어댑터 | Integration | Implemented | High | project maintainers | [req-012](./Integration/req-012_kis-broker-adapter.md) |
+| REQ-013 | 주문 집행 루프 (claim·송신·체결·롤백) | Integration | Implemented | High | project maintainers | [req-013](./Integration/req-013_order-execution-loop.md) |
+| REQ-014 | 주문 핸드오프 durability + reconciliation | Exception | Implemented | High | project maintainers | [req-014](./Exception/req-014_order-handoff-durability-reconciliation.md) |
+| REQ-015 | 브로커/집행 baseline 문서 정합 | Documentation | Implemented | Medium | project maintainers | [req-015](./Documentation/req-015_broker-execution-baseline-alignment.md) |
 
 ## Recent Change Log Summary
 
+- 2026-06-04 :: REQ-011~015 Approved → Implemented — BAT-004 verification evidence 기반. (confirm-req-implemented)
+- 2026-06-04 :: REQ-011~015 Proposed → Approved — 승인 게이트 통과. (confirm-req)
 - 2026-06-04 :: REQ-011~015 최초 생성(Proposed) — dcy-003 FR-1~FR-6 분해. (draft-req)
 - 2026-06-04 :: REQ-010 Approved → Implemented — BAT-003 verification evidence 기반. (confirm-req-implemented)
-- 2026-06-04 :: REQ-010 생성 + Approved — 데몬 .env 로딩 (minor-change). (draft-req/confirm-req)
-- 2026-06-03 :: REQ-005~009 Approved → Implemented — BAT-002 verification evidence 기반. (confirm-req-implemented)
-- 2026-06-03 :: REQ-005~009 Proposed → Approved — 승인 게이트 통과. (confirm-req)
-- 2026-06-03 :: REQ-001~004 Approved → Implemented — BAT-001 verification evidence 기반. (confirm-req-implemented)
\ No newline at end of file
+- 2026-06-04 :: REQ-010 생성 + Approved — 데몬 .env 로딩 (minor-change). (draft-req/confirm-req)
\ No newline at end of file
diff --git a/tests/adapters/broker/__init__.py b/tests/adapters/broker/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/adapters/broker/test_kis.py b/tests/adapters/broker/test_kis.py
new file mode 100644
index 0000000..26f1e36
--- /dev/null
+++ b/tests/adapters/broker/test_kis.py
@@ -0,0 +1,77 @@
+"""KIS adapter tests (REQ-012).
+
+Unit tests run always; the sandbox integration test runs only when KIS
+모의투자 credentials are present (TREX_KIS_BROKER_* env / .env).
+"""
+from __future__ import annotations
+
+import os
+
+import pytest
+
+from trex_core.adapters.broker.kis import KISBroker
+from trex_core.application.broker_port import OrderRequest
+
+_MOCK_URL = "https://openapivts.koreainvestment.com:29443"
+
+
+def test_account_split_and_mock_tr_ids():
+    b = KISBroker("12345678-01", app_key="k", app_secret="s", base_url=_MOCK_URL)
+    assert b._account() == ("12345678", "01")
+    assert b._tr_submit("buy") == "VTTC0012U"
+    assert b._tr_submit("sell") == "VTTC0011U"
+    assert b.name() == "kis-mock"
+
+
+def test_live_base_url_requires_allow_live():
+    with pytest.raises(RuntimeError):
+        KISBroker("12345678-01", app_key="k", app_secret="s",
+                   base_url="https://openapi.koreainvestment.com:9443")
+    # gated on explicitly
+    b = KISBroker("12345678-01", app_key="k", app_secret="s",
+                  base_url="https://openapi.koreainvestment.com:9443", allow_live=True)
+    assert b.name() == "kis-live" and b._tr_submit("buy") == "TTTC0012U"
+
+
+def _kis_env():
+    keys = ("TREX_KIS_BROKER_BASE_URL", "TREX_KIS_BROKER_APP_KEY",
+            "TREX_KIS_BROKER_APP_SECRET", "TREX_KIS_BROKER_ACCOUNT_REF")
+    if not all(os.environ.get(k) for k in keys):
+        # try .env via dotenv
+        try:
+            from dotenv import load_dotenv, find_dotenv
+            load_dotenv(find_dotenv(usecwd=True), override=False)
+        except ImportError:
+            pass
+    if not all(os.environ.get(k) for k in keys):
+        pytest.skip("KIS 모의투자 credentials not set; skipping sandbox integration test")
+    return {k: os.environ[k] for k in keys}
+
+
+def test_sandbox_token_and_submit():
+    """Single sandbox round-trip (one token issuance — KIS rate-limits token requests)."""
+    import httpx
+
+    env = _kis_env()
+    assert "openapivts" in env["TREX_KIS_BROKER_BASE_URL"], "expect 모의투자 sandbox URL"
+    b = KISBroker(
+        env["TREX_KIS_BROKER_ACCOUNT_REF"],
+        app_key=env["TREX_KIS_BROKER_APP_KEY"],
+        app_secret=env["TREX_KIS_BROKER_APP_SECRET"],
+        base_url=env["TREX_KIS_BROKER_BASE_URL"],
+        timeout=float(os.environ.get("TREX_KIS_BROKER_TIMEOUT", "10")),
+    )
+    try:
+        token = b._ensure_token()
+    except httpx.HTTPStatusError as exc:  # KIS EGW00133: token issuance rate-limited
+        pytest.skip(f"KIS token rate-limited/unavailable: {exc}")
+    assert isinstance(token, str) and len(token) > 0
+
+    # limit buy 1 share at a low price (sandbox, no real money). Reuses the cached token.
+    ack = b.submit_order(OrderRequest(slot_id="t", side="buy", symbol="005930", qty=1,
+                                      limit_price=10000, order_type="00"))
+    assert ack.raw, "expected a KIS response payload"
+    if ack.accepted:
+        assert ack.broker_order_id
+    else:
+        assert ack.reason  # rejection carries a reason (e.g., 장 미개장/잔고부족)
diff --git a/tests/adapters/broker/test_paper.py b/tests/adapters/broker/test_paper.py
new file mode 100644
index 0000000..b6960f8
--- /dev/null
+++ b/tests/adapters/broker/test_paper.py
@@ -0,0 +1,50 @@
+"""Paper broker deterministic async double tests (REQ-011)."""
+from __future__ import annotations
+
+from trex_core.adapters.broker.paper import PaperBroker
+from trex_core.application.broker_port import OrderRequest
+
+
+def _req(symbol="005930", qty=10, price=1000):
+    return OrderRequest(slot_id="s1", side="buy", symbol=symbol, qty=qty, limit_price=price)
+
+
+def test_submit_does_not_synchronously_fill():
+    b = PaperBroker(fill_after_polls=1)
+    ack = b.submit_order(_req())
+    assert ack.accepted and ack.broker_order_id
+    # next poll is still 'accepted' (async contract, no synchronous shortcut)
+    fs = b.poll_fill(ack.broker_order_id, side="buy", symbol="005930")
+    assert fs.state == "accepted" and fs.filled_qty == 0
+
+
+def test_fills_after_configured_polls():
+    b = PaperBroker(fill_after_polls=1)
+    ack = b.submit_order(_req())
+    b.poll_fill(ack.broker_order_id, side="buy", symbol="005930")  # poll 1 -> accepted
+    fs = b.poll_fill(ack.broker_order_id, side="buy", symbol="005930")  # poll 2 -> filled
+    assert fs.is_filled and fs.filled_qty == 10 and fs.avg_price == 1000.0
+
+
+def test_immediate_fill_on_first_poll():
+    b = PaperBroker(fill_after_polls=0)
+    ack = b.submit_order(_req())
+    fs = b.poll_fill(ack.broker_order_id, side="buy", symbol="005930")
+    assert fs.is_filled
+
+
+def test_partial_then_full():
+    b = PaperBroker(fill_after_polls=0, qty_per_poll=4)
+    ack = b.submit_order(_req(qty=10))
+    f1 = b.poll_fill(ack.broker_order_id, side="buy", symbol="005930")
+    assert f1.state == "partially_filled" and f1.filled_qty == 4
+    b.poll_fill(ack.broker_order_id, side="buy", symbol="005930")  # 8
+    f3 = b.poll_fill(ack.broker_order_id, side="buy", symbol="005930")  # 10
+    assert f3.is_filled and f3.filled_qty == 10
+
+
+def test_reject():
+    b = PaperBroker(reject_symbols={"005930"})
+    ack = b.submit_order(_req())
+    fs = b.poll_fill(ack.broker_order_id, side="buy", symbol="005930")
+    assert fs.state == "rejected"
diff --git a/tests/application/test_execution.py b/tests/application/test_execution.py
new file mode 100644
index 0000000..5db4d1a
--- /dev/null
+++ b/tests/application/test_execution.py
@@ -0,0 +1,90 @@
+"""Order execution loop tests via paper broker (REQ-013, REQ-014).
+
+In-memory adapters; deterministic paper double drives the full async path.
+"""
+from __future__ import annotations
+
+from datetime import date
+
+from trex_core.adapters.broker.paper import PaperBroker
+from trex_core.adapters.persistence.in_memory_intent_store import InMemoryIntentStore
+from trex_core.application.execution import ExecutionService
+from trex_core.application.intents import BuyIntent, IntentService, SellIntent
+from trex_core.domain.slot import SlotService, SlotState
+from trex_core.domain.slot.in_memory_repository import InMemorySlotRepository
+
+DAY = date(2026, 6, 4)
+
+
+def _wire(broker):
+    repo = InMemorySlotRepository()
+    svc = SlotService(repo)
+    intents = IntentService(svc, repo, InMemoryIntentStore())
+    execution = ExecutionService(svc, repo, broker)
+    svc.preallocate_daily_slots(DAY, 5)
+    return repo, svc, intents, execution
+
+
+def _buy(intents, iid="b1", symbol="005930", qty=10):
+    return intents.submit_buy(BuyIntent(intent_id=iid, trading_date=DAY, symbol=symbol, qty=qty, entry_price=1000))
+
+
+def test_buy_lifecycle_to_holding():
+    repo, svc, intents, execution = _wire(PaperBroker(fill_after_polls=0))
+    d = _buy(intents)
+    sid = d.slot_id
+    assert repo.fetch_slot(sid).status is SlotState.PENDING_BUY
+    execution.run_once()  # dispatch + poll(fill immediately)
+    slot = repo.fetch_slot(sid)
+    assert slot.status is SlotState.HOLDING and slot.qty == 10 and slot.avg_price == 1000.0
+
+
+def test_buy_dispatch_is_idempotent_no_double_order():
+    broker = PaperBroker(fill_after_polls=5)  # stays accepted (not filled) across ticks
+    repo, svc, intents, execution = _wire(broker)
+    sid = _buy(intents).slot_id
+    execution.run_once()   # dispatch (1 order) + poll(accepted)
+    bid1 = repo.fetch_slot(sid).broker_order_id
+    execution.run_once()   # must NOT re-dispatch
+    bid2 = repo.fetch_slot(sid).broker_order_id
+    assert bid1 == bid2 and len(broker._orders) == 1  # exactly one broker order
+
+
+def test_buy_reject_rolls_back_to_idle():
+    repo, svc, intents, execution = _wire(PaperBroker(reject_symbols={"005930"}))
+    sid = _buy(intents).slot_id
+    execution.run_once()  # dispatch + poll(reject)
+    slot = repo.fetch_slot(sid)
+    assert slot.status is SlotState.IDLE and slot.symbol is None and slot.broker_order_id is None
+
+
+def test_sell_lifecycle_to_closed_bumps_entry_count():
+    repo, svc, intents, execution = _wire(PaperBroker(fill_after_polls=0))
+    sid = _buy(intents).slot_id
+    execution.run_once()  # -> holding
+    assert repo.fetch_slot(sid).status is SlotState.HOLDING
+    intents.submit_sell(SellIntent(intent_id="s1", slot_id=sid))
+    assert repo.fetch_slot(sid).status is SlotState.PENDING_SELL
+    execution.run_once()  # dispatch sell + fill -> closed
+    assert repo.fetch_slot(sid).status is SlotState.CLOSED
+    assert svc.get_today_entry_count(DAY, "005930") == 0  # +1 happens on closed->idle recovery
+
+
+def test_reconcile_after_crash_completes_fill_without_redispatch():
+    broker = PaperBroker(fill_after_polls=1)
+    repo, svc, intents, execution = _wire(broker)
+    sid = _buy(intents).slot_id
+    execution.run_once()             # dispatch + poll1 (accepted, not filled) — simulates crash here
+    assert repo.fetch_slot(sid).status is SlotState.PENDING_BUY
+    orders_before = len(broker._orders)
+    execution.reconcile()            # restart: re-poll -> fills, no new order
+    slot = repo.fetch_slot(sid)
+    assert slot.status is SlotState.HOLDING
+    assert len(broker._orders) == orders_before  # reconcile did not submit a new order
+
+
+def test_no_idle_slots_blocks_further_buys():
+    repo, svc, intents, execution = _wire(PaperBroker(fill_after_polls=0))
+    for i in range(5):
+        assert _buy(intents, iid=f"b{i}").status == "admitted"
+    assert _buy(intents, iid="overflow").status == "rejected"
diff --git a/trex_core/adapters/broker/__init__.py b/trex_core/adapters/broker/__init__.py
new file mode 100644
index 0000000..3340a09
--- /dev/null
+++ b/trex_core/adapters/broker/__init__.py
@@ -0,0 +1 @@
+"""Broker adapters (REQ-011/012). Implement application.broker_port.BrokerPort."""
diff --git a/trex_core/adapters/broker/kis.py b/trex_core/adapters/broker/kis.py
new file mode 100644
index 0000000..b03fe22
--- /dev/null
+++ b/trex_core/adapters/broker/kis.py
@@ -0,0 +1,189 @@
+"""KIS (한국투자증권) Open API broker adapter (REQ-012, dcy-003).
+
+Implements BrokerPort against the KIS REST API, modeled on the trex-orbit
+reference (app/broker/kis.py). Slice 1 validates against the KIS 모의투자
+(VTS sandbox) server; real-account go-live is config-gated and out of scope.
+
+Endpoints: /oauth2/tokenP (token), /uapi/domestic-stock/v1/trading/order-cash
+(submit), /uapi/domestic-stock/v1/trading/inquire-daily-ccld (fill poll),
+/uapi/domestic-stock/v1/trading/order-rvsecncl (cancel).
+"""
+from __future__ import annotations
+
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+
+import httpx
+
+from trex_core.application.broker_port import FillStatus, OrderAck, OrderRequest
+
+_KST = timezone(timedelta(hours=9))
+_MOCK_HINTS = ("openapivts", "virtual", "mock")
+
+
+def _safe_int(v: object) -> Optional[int]:
+    try:
+        return int(str(v).strip())
+    except (TypeError, ValueError):
+        return None
+
+
+class KISBroker:
+    """KIS REST broker adapter. Live account is gated behind `allow_live`."""
+
+    def __init__(
+        self,
+        account_ref: str,
+        *,
+        app_key: str,
+        app_secret: str,
+        base_url: str,
+        timeout: float = 5.0,
+        allow_live: bool = False,
+    ) -> None:
+        self._account_ref = account_ref
+        self._app_key = app_key
+        self._app_secret = app_secret
+        self._base_url = base_url.rstrip("/")
+        self._timeout = timeout
+        self._token: Optional[str] = None
+        self._token_exp: datetime = datetime.now(tz=timezone.utc)
+        is_mock = any(h in self._base_url for h in _MOCK_HINTS)
+        if not is_mock and not allow_live:
+            raise RuntimeError(
+                "KIS live account base_url requires allow_live=True (config-gated). "
+                "Use the 모의투자 (openapivts) endpoint for slice-1."
+            )
+        self._mock = is_mock
+
+    def name(self) -> str:
+        return "kis-mock" if self._mock else "kis-live"
+
+    # --- auth ---
+    def _ensure_token(self) -> str:
+        if self._token and datetime.now(tz=timezone.utc) < self._token_exp:
+            return self._token
+        resp = httpx.post(
+            f"{self._base_url}/oauth2/tokenP",
+            json={
+                "grant_type": "client_credentials",
+                "appkey": self._app_key,
+                "appsecret": self._app_secret,
+            },
+            timeout=self._timeout,
+        )
+        resp.raise_for_status()
+        data = resp.json()
+        self._token = data["access_token"]
+        ttl = int(data.get("expires_in", 3600))
+        self._token_exp = datetime.now(tz=timezone.utc) + timedelta(seconds=max(60, ttl - 300))
+        return self._token
+
+    def _headers(self, tr_id: str) -> dict[str, str]:
+        return {
+            "authorization": f"Bearer {self._ensure_token()}",
+            "appkey": self._app_key,
+            "appsecret": self._app_secret,
+            "tr_id": tr_id,
+            "content-type": "application/json; charset=utf-8",
+        }
+
+    def _account(self) -> tuple[str, str]:
+        raw = self._account_ref.strip()
+        if "-" in raw:
+            cano, product = raw.split("-", 1)
+            return cano.strip(), product.strip()
+        digits = "".join(c for c in raw if c.isdigit())
+        return digits[:8], (digits[8:] or "01")
+
+    def _tr_submit(self, side: str) -> str:
+        if self._mock:
+            return "VTTC0012U" if side == "buy" else "VTTC0011U"
+        return "TTTC0012U" if side == "buy" else "TTTC0011U"
+
+    # --- BrokerPort ---
+    def submit_order(self, req: OrderRequest) -> OrderAck:
+        cano, product = self._account()
+        body = {
+            "CANO": cano,
+            "ACNT_PRDT_CD": product,
+            "PDNO": req.symbol,
+            "ORD_DVSN": req.order_type,
+            "ORD_QTY": str(req.qty),
+            "ORD_UNPR": str(req.limit_price or 0),
+        }
+        try:
+            resp = httpx.post(
+                f"{self._base_url}/uapi/domestic-stock/v1/trading/order-cash",
+                headers=self._headers(self._tr_submit(req.side)),
+                json=body,
+                timeout=self._timeout,
+            )
+            payload = resp.json()
+        except (httpx.HTTPError, ValueError) as exc:
+            return OrderAck(accepted=False, reason=f"submit_network_error:{type(exc).__name__}",
+                            raw={"error": str(exc)})
+        if str(payload.get("rt_cd")) == "0":
+            out = payload.get("output") or {}
+            odno = out.get("ODNO") or out.get("odno")
+            orgno = out.get("KRX_FWDG_ORD_ORGNO") or out.get("ord_gno_brno") or ""
+            bid = f"{orgno}:{odno}" if orgno else str(odno)
+            return OrderAck(accepted=True, broker_order_id=bid, raw=payload)
+        return OrderAck(accepted=False, reason=payload.get("msg1") or payload.get("msg_cd"),
+                        raw=payload)
+
+    def poll_fill(self, broker_order_id: str, *, side: str, symbol: str) -> FillStatus:
+        cano, product = self._account()
+        odno = broker_order_id.split(":")[-1]
+        today = datetime.now(tz=_KST).strftime("%Y%m%d")
+        tr_id = "VTTC8001R" if self._mock else "TTTC8001R"
+        params = {
+            "CANO": cano, "ACNT_PRDT_CD": product,
+            "INQR_STRT_DT": today, "INQR_END_DT": today,
+            "SLL_BUY_DVSN_CD": "00", "INQR_DVSN": "00", "PDNO": "",
+            "CCLD_DVSN": "00", "ORD_GNO_BRNO": "", "ODNO": odno,
+            "INQR_DVSN_3": "00", "INQR_DVSN_1": "",
+            "CTX_AREA_FK100": "", "CTX_AREA_NK100": "",
+        }
+        try:
+            resp = httpx.get(
+                f"{self._base_url}/uapi/domestic-stock/v1/trading/inquire-daily-ccld",
+                headers=self._headers(tr_id), params=params, timeout=self._timeout,
+            )
+            payload = resp.json()
+        except (httpx.HTTPError, ValueError) as exc:
+            return FillStatus(state="unknown", raw={"error": str(exc)})
+        rows = payload.get("output1") or []
+        row = next((r for r in rows if str(r.get("odno")) == odno), rows[0] if rows else None)
+        if row is None:
+            return FillStatus(state="accepted", raw=payload)
+        ord_qty = _safe_int(row.get("ord_qty")) or 0
+        ccld_qty = _safe_int(row.get("tot_ccld_qty")) or 0
+        avg = _safe_int(row.get("avg_prvs")) or _safe_int(row.get("ccld_prvs"))
+        if ccld_qty <= 0:
+            return FillStatus(state="accepted", raw=row)
+        if ccld_qty >= ord_qty and ord_qty > 0:
+            return FillStatus(state="filled", filled_qty=ccld_qty,
+                              avg_price=float(avg) if avg else None, raw=row)
+        return FillStatus(state="partially_filled", filled_qty=ccld_qty,
+                          avg_price=float(avg) if avg else None, raw=row)
+
+    def cancel_order(self, broker_order_id: str, *, side: str, symbol: str, qty: int) -> bool:
+        cano, product = self._account()
+        parts = broker_order_id.split(":")
+        orgno, odno = (parts[0], parts[1]) if len(parts) == 2 else ("", parts[-1])
+        body = {
+            "CANO": cano, "ACNT_PRDT_CD": product,
+            "KRX_FWDG_ORD_ORGNO": orgno, "ORGN_ODNO": odno,
+            "ORD_DVSN": "00", "RVSE_CNCL_DVSN_CD": "02",
+            "ORD_QTY": str(qty), "ORD_UNPR": "0", "QTY_ALL_ORD_YN": "Y",
+        }
+        tr_id = "VTTC0013U" if self._mock else "TTTC0013U"
+        try:
+            resp = httpx.post(
+                f"{self._base_url}/uapi/domestic-stock/v1/trading/order-rvsecncl",
+                headers=self._headers(tr_id), json=body, timeout=self._timeout,
+            )
+            return str(resp.json().get("rt_cd")) == "0"
+        except (httpx.HTTPError, ValueError):
+            return False
diff --git a/trex_core/adapters/broker/paper.py b/trex_core/adapters/broker/paper.py
new file mode 100644
index 0000000..5cc014d
--- /dev/null
+++ b/trex_core/adapters/broker/paper.py
@@ -0,0 +1,84 @@
+"""Paper/stub broker — deterministic async double (REQ-011, dcy-003 OQ-2).
+
+Follows the same submit -> poll contract as the real KIS adapter (no
+synchronous shortcut), but lets tests program WHEN/whether fills happen:
+immediate, after N polls, partial, or reject. This exercises the same
+execution code path that production (KIS) takes.
+"""
+from __future__ import annotations
+
+import threading
+from typing import Optional
+
+from trex_core.application.broker_port import FillStatus, OrderAck, OrderRequest
+
+
+class _Order:
+    def __init__(self, oid: str, req: OrderRequest) -> None:
+        self.oid = oid
+        self.side = req.side
+        self.symbol = req.symbol
+        self.qty = req.qty
+        self.price = float(req.limit_price) if req.limit_price is not None else 1000.0
+        self.polls = 0
+        self.filled = 0
+        self.cancelled = False
+
+
+class PaperBroker:
+    """Deterministic async paper broker.
+
+    - fill_after_polls: number of poll_fill calls before fills begin (0 => fills on first poll)
+    - qty_per_poll: filled quantity per poll once filling (None => fill remaining at once)
+    - reject_symbols: symbols whose orders are rejected on first poll
+    """
+
+    def __init__(
+        self,
+        *,
+        fill_after_polls: int = 0,
+        qty_per_poll: Optional[int] = None,
+        reject_symbols: Optional[set[str]] = None,
+    ) -> None:
+        self._fill_after = fill_after_polls
+        self._qty_per_poll = qty_per_poll
+        self._reject = reject_symbols or set()
+        self._orders: dict[str, _Order] = {}
+        self._seq = 0
+        self._lock = threading.Lock()
+
+    def name(self) -> str:
+        return "paper"
+
+    def submit_order(self, req: OrderRequest) -> OrderAck:
+        with self._lock:
+            self._seq += 1
+            oid = f"PAPER-{self._seq:06d}"
+            self._orders[oid] = _Order(oid, req)
+        return OrderAck(accepted=True, broker_order_id=oid)
+
+    def poll_fill(self, broker_order_id: str, *, side: str, symbol: str) -> FillStatus:
+        with self._lock:
+            o = self._orders.get(broker_order_id)
+            if o is None:
+                return FillStatus(state="unknown")
+            if o.cancelled:
+                return FillStatus(state="cancelled")
+            o.polls += 1
+            if symbol in self._reject:
+                return FillStatus(state="rejected", raw={"reason": "paper_reject"})
+            if o.polls <= self._fill_after:
+                return FillStatus(state="accepted", filled_qty=o.filled, avg_price=o.price)
+            step = self._qty_per_poll if self._qty_per_poll is not None else (o.qty - o.filled)
+            o.filled = min(o.qty, o.filled + step)
+            if o.filled >= o.qty:
+                return FillStatus(state="filled", filled_qty=o.filled, avg_price=o.price)
+            return FillStatus(state="partially_filled", filled_qty=o.filled, avg_price=o.price)
+
+    def cancel_order(self, broker_order_id: str, *, side: str, symbol: str, qty: int) -> bool:
+        with self._lock:
+            o = self._orders.get(broker_order_id)
+            if o is None or o.filled >= o.qty:
+                return False
+            o.cancelled = True
+            return True
diff --git a/trex_core/adapters/persistence/postgresql.py b/trex_core/adapters/persistence/postgresql.py
index 67ea0b0..d78dee2 100644
--- a/trex_core/adapters/persistence/postgresql.py
+++ b/trex_core/adapters/persistence/postgresql.py
@@ -170,6 +170,48 @@ class PostgreSQLSlotRepository:
                 row = cur.fetchone()
                 return int(row[0]) if row else 0
 
+    # --- order execution queue (BAT-004 / REQ-013, option A) ---
+    def find_pending_for_dispatch(self) -> Optional[Slot]:
+        with self._psycopg.connect(self._dsn) as conn:
+            with conn.cursor() as cur:
+                cur.execute(
+                    f"SELECT {_SLOT_COLUMNS} FROM daily_slot "
+                    "WHERE status IN ('pending_buy','pending_sell') AND broker_order_id IS NULL "
+                    "ORDER BY updated_at LIMIT 1 FOR UPDATE SKIP LOCKED"
+                )
+                row = cur.fetchone()
+                return self._row_to_slot(row) if row else None
+
+    def mark_dispatched(self, slot_id: UUID, broker_order_id: str) -> bool:
+        with self._psycopg.connect(self._dsn, autocommit=False) as conn:
+            with conn.cursor() as cur:
+                cur.execute(
+                    "UPDATE daily_slot SET broker_order_id=%s, updated_at=%s "
+                    "WHERE slot_id=%s AND broker_order_id IS NULL",
+                    (broker_order_id, datetime.now(tz=timezone.utc), slot_id),
+                )
+                ok = cur.rowcount == 1
+                conn.commit()
+                return ok
+
+    def list_dispatched_pending(self) -> list[Slot]:
+        with self._psycopg.connect(self._dsn) as conn:
+            with conn.cursor() as cur:
+                cur.execute(
+                    f"SELECT {_SLOT_COLUMNS} FROM daily_slot "
+                    "WHERE status IN ('pending_buy','pending_sell') AND broker_order_id IS NOT NULL"
+                )
+                return [self._row_to_slot(r) for r in cur.fetchall()]
+
+    def clear_dispatch(self, slot_id: UUID) -> None:
+        with self._psycopg.connect(self._dsn, autocommit=False) as conn:
+            with conn.cursor() as cur:
+                cur.execute(
+                    "UPDATE daily_slot SET broker_order_id=NULL, updated_at=%s WHERE slot_id=%s",
+                    (datetime.now(tz=timezone.utc), slot_id),
+                )
+                conn.commit()
+
     def count_slots_by_status(self, trading_date: date) -> dict[SlotState, int]:
         with self._psycopg.connect(self._dsn) as conn:
             with conn.cursor() as cur:
diff --git a/trex_core/application/broker_port.py b/trex_core/application/broker_port.py
new file mode 100644
index 0000000..d726b2a
--- /dev/null
+++ b/trex_core/application/broker_port.py
@@ -0,0 +1,64 @@
+"""Broker port + DTOs (REQ-011, dcy-003).
+
+The single broker boundary (invariant B): only the core, through this port,
+submits/cancels orders and observes fills. Adapters (paper, KIS) live in
+trex_core.adapters.broker. Fills are observed asynchronously via poll_fill
+(unified contract — paper does not shortcut to synchronous, dcy-003 OQ-2).
+"""
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any, Optional, Protocol
+
+
+@dataclass(frozen=True)
+class OrderRequest:
+    slot_id: str          # originating slot (audit/correlation)
+    side: str             # 'buy' | 'sell'
+    symbol: str
+    qty: int
+    limit_price: Optional[int] = None   # None => market order
+    order_type: str = "00"              # KIS ORD_DVSN: 00 limit, 01 market
+
+
+@dataclass(frozen=True)
+class OrderAck:
+    accepted: bool
+    broker_order_id: Optional[str] = None
+    reason: Optional[str] = None
+    raw: dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass(frozen=True)
+class FillStatus:
+    state: str            # accepted | partially_filled | filled | rejected | cancelled | unknown
+    filled_qty: int = 0
+    avg_price: Optional[float] = None
+    raw: dict[str, Any] = field(default_factory=dict)
+
+    @property
+    def is_filled(self) -> bool:
+        return self.state == "filled"
+
+    @property
+    def is_terminal_reject(self) -> bool:
+        return self.state in {"rejected", "cancelled"}
+
+
+class BrokerPort(Protocol):
+    """Single broker session boundary (invariant B)."""
+
+    def name(self) -> str:
+        ...
+
+    def submit_order(self, req: OrderRequest) -> OrderAck:
+        """Submit an order. Returns accepted + broker_order_id (no synchronous fill)."""
+        ...
+
+    def poll_fill(self, broker_order_id: str, *, side: str, symbol: str) -> FillStatus:
+        """Observe current fill status for a previously accepted order."""
+        ...
+
+    def cancel_order(self, broker_order_id: str, *, side: str, symbol: str, qty: int) -> bool:
+        """Best-effort cancel. Returns True if the broker accepted the cancel."""
+        ...
diff --git a/trex_core/application/execution.py b/trex_core/application/execution.py
new file mode 100644
index 0000000..31f6d50
--- /dev/null
+++ b/trex_core/application/execution.py
@@ -0,0 +1,125 @@
+"""Order execution service (REQ-013, REQ-014, dcy-003).
+
+A single background execution loop (invariant A single writer, invariant B
+single broker session) that, per tick:
+  dispatch: claim pending slots with broker_order_id IS NULL (option A queue),
+            submit the order, record broker_order_id (idempotency guard).
+  poll:     observe fills on dispatched pending slots and transition the slot
+            (pending_buy->holding / pending_sell->closed), or roll back on reject.
+reconcile() re-polls dispatched slots on restart so a crash after dispatch
+converges without duplicate orders (REQ-014).
+
+All slot writes go through SlotService (advisory lock). The broker is touched
+only here, never by the domain or the HTTP API.
+"""
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from trex_core.application.broker_port import BrokerPort, OrderRequest
+from trex_core.domain.slot import SlotService, SlotState, SlotStateMismatchError
+
+_MAX_DISPATCH_PER_TICK = 64
+
+
+@dataclass
+class ExecutionResult:
+    dispatched: int = 0
+    filled: int = 0
+    rolled_back: int = 0
+
+
+class ExecutionService:
+    def __init__(self, slot_service: SlotService, repo, broker: BrokerPort) -> None:
+        self._svc = slot_service
+        self._repo = repo
+        self._broker = broker
+
+    # ------------------------------------------------------------
+    def run_once(self) -> ExecutionResult:
+        r = ExecutionResult()
+        self._dispatch(r)
+        self._poll(r)
+        return r
+
+    def reconcile(self) -> ExecutionResult:
+        """Restart recovery: re-poll dispatched-but-pending slots (REQ-014).
+
+        Undispatched pending slots (broker_order_id IS NULL) are simply picked
+        up by the next dispatch, so a crash before dispatch causes no duplicate.
+        """
+        r = ExecutionResult()
+        self._poll(r)
+        return r
+
+    # ------------------------------------------------------------
+    def _dispatch(self, r: ExecutionResult) -> None:
+        for _ in range(_MAX_DISPATCH_PER_TICK):
+            slot = self._repo.find_pending_for_dispatch()
+            if slot is None:
+                return
+            side = "buy" if slot.status is SlotState.PENDING_BUY else "sell"
+            qty = int(slot.qty or 0)
+            limit = int(slot.entry_price) if slot.entry_price else None
+            ack = self._broker.submit_order(
+                OrderRequest(
+                    slot_id=str(slot.slot_id),
+                    side=side,
+                    symbol=slot.symbol or "",
+                    qty=qty,
+                    limit_price=limit,
+                    order_type="00" if limit is not None else "01",
+                )
+            )
+            if ack.accepted and ack.broker_order_id:
+                self._repo.mark_dispatched(slot.slot_id, ack.broker_order_id)
+                r.dispatched += 1
+            else:
+                self._rollback(slot, reason=ack.reason or "order_rejected")
+                r.rolled_back += 1
+
+    def _poll(self, r: ExecutionResult) -> None:
+        for slot in self._repo.list_dispatched_pending():
+            side = "buy" if slot.status is SlotState.PENDING_BUY else "sell"
+            fs = self._broker.poll_fill(slot.broker_order_id, side=side, symbol=slot.symbol or "")
+            if fs.is_filled:
+                self._on_filled(slot, fs)
+                r.filled += 1
+            elif fs.is_terminal_reject:
+                self._rollback(slot, reason=f"order_{fs.state}")
+                r.rolled_back += 1
+            # accepted / partially_filled -> leave for next tick
+
+    # ------------------------------------------------------------
+    def _on_filled(self, slot, fs) -> None:
+        try:
+            if slot.status is SlotState.PENDING_BUY:
+                self._svc.transit_slot(
+                    slot.slot_id, SlotState.PENDING_BUY, SlotState.HOLDING,
+                    reason="buy_filled", actor="execution_loop",
+                    avg_price=fs.avg_price, qty=float(fs.filled_qty) or slot.qty,
+                )
+            else:  # PENDING_SELL
+                self._svc.transit_slot(
+                    slot.slot_id, SlotState.PENDING_SELL, SlotState.CLOSED,
+                    reason="sell_filled", actor="execution_loop",
+                )
+        except SlotStateMismatchError:
+            return  # slot moved concurrently; next tick reconciles
+        self._repo.clear_dispatch(slot.slot_id)  # done with this order
+
+    def _rollback(self, slot, *, reason: str) -> None:
+        try:
+            if slot.status is SlotState.PENDING_BUY:
+                self._svc.transit_slot(
+                    slot.slot_id, SlotState.PENDING_BUY, SlotState.IDLE,
+                    reason=reason, actor="execution_loop",
+                )  # idle reset clears broker_order_id in the domain
+            else:  # PENDING_SELL rejected -> back to holding, clear order for re-dispatch
+                self._svc.transit_slot(
+                    slot.slot_id, SlotState.PENDING_SELL, SlotState.HOLDING,
+                    reason=reason, actor="execution_loop",
+                )
+                self._repo.clear_dispatch(slot.slot_id)
+        except SlotStateMismatchError:
+            return
diff --git a/trex_core/domain/slot/in_memory_repository.py b/trex_core/domain/slot/in_memory_repository.py
index d9ffb5c..bf4a98c 100644
--- a/trex_core/domain/slot/in_memory_repository.py
+++ b/trex_core/domain/slot/in_memory_repository.py
@@ -7,6 +7,7 @@ from __future__ import annotations
 
 import threading
 from contextlib import contextmanager
+from dataclasses import replace
 from datetime import date, datetime, timezone
 from typing import Iterator, Optional
 from uuid import UUID, uuid4
@@ -103,6 +104,41 @@ class InMemorySlotRepository:
         count, _ = self._entries.get((trading_date, symbol), (0, datetime.min))
         return count
 
+    # --- order execution queue (BAT-004 / REQ-013, option A) ---
+    _PENDING = (SlotState.PENDING_BUY, SlotState.PENDING_SELL)
+
+    def find_pending_for_dispatch(self) -> Optional[Slot]:
+        """A pending slot not yet dispatched (broker_order_id IS NULL)."""
+        for s in self._slots.values():
+            if s.status in self._PENDING and s.broker_order_id is None:
+                return s
+        return None
+
+    def mark_dispatched(self, slot_id: UUID, broker_order_id: str) -> bool:
+        """Atomically set broker_order_id iff still undispatched (idempotency guard)."""
+        s = self._slots.get(slot_id)
+        if s is None or s.broker_order_id is not None:
+            return False
+        self._slots[slot_id] = replace(
+            s, broker_order_id=broker_order_id, updated_at=datetime.now(tz=timezone.utc)
+        )
+        return True
+
+    def list_dispatched_pending(self) -> list[Slot]:
+        """Pending slots already dispatched (broker_order_id NOT NULL) — poll targets."""
+        return [
+            s for s in self._slots.values()
+            if s.status in self._PENDING and s.broker_order_id is not None
+        ]
+
+    def clear_dispatch(self, slot_id: UUID) -> None:
+        """Reset broker_order_id so the slot can be (re)dispatched (e.g. after a buy fill)."""
+        s = self._slots.get(slot_id)
+        if s is not None:
+            self._slots[slot_id] = replace(
+                s, broker_order_id=None, updated_at=datetime.now(tz=timezone.utc)
+            )
+
     # --- bulk counts ---
     def count_slots_by_status(self, trading_date: date) -> dict[SlotState, int]:
         result: dict[SlotState, int] = {}
diff --git a/trex_core/runtime/config.py b/trex_core/runtime/config.py
index 4e445b3..830fb24 100644
--- a/trex_core/runtime/config.py
+++ b/trex_core/runtime/config.py
@@ -1,8 +1,9 @@
-"""Daemon configuration resolution (REQ-005, REQ-010)."""
+"""Daemon configuration resolution (REQ-005, REQ-010, REQ-012/013)."""
 from __future__ import annotations
 
 import os
 from dataclasses import dataclass
+from typing import Optional
 
 
 def _load_dotenv() -> None:
@@ -19,12 +20,25 @@ def _load_dotenv() -> None:
     load_dotenv(find_dotenv(usecwd=True), override=False)
 
 
+@dataclass(frozen=True)
+class KISConfig:
+    base_url: str
+    app_key: str
+    app_secret: str
+    account_ref: str
+    timeout: float
+    allow_live: bool
+
+
 @dataclass(frozen=True)
 class DaemonConfig:
     dsn: str
     total_slots: int
     host: str
     port: int
+    broker: str                      # 'paper' | 'kis'
+    execution_interval_sec: float
+    kis: Optional[KISConfig] = None
 
     @staticmethod
     def from_env() -> "DaemonConfig":
@@ -34,9 +48,23 @@ class DaemonConfig:
             raise RuntimeError(
                 "TREX_POSTGRESQL_DSN is required to start the slot-core daemon."
             )
+        broker = os.environ.get("TREX_BROKER", "paper").strip().lower()
+        kis: Optional[KISConfig] = None
+        if broker == "kis":
+            kis = KISConfig(
+                base_url=os.environ["TREX_KIS_BROKER_BASE_URL"],
+                app_key=os.environ["TREX_KIS_BROKER_APP_KEY"],
+                app_secret=os.environ["TREX_KIS_BROKER_APP_SECRET"],
+                account_ref=os.environ["TREX_KIS_BROKER_ACCOUNT_REF"],
+                timeout=float(os.environ.get("TREX_KIS_BROKER_TIMEOUT", "5")),
+                allow_live=os.environ.get("TREX_KIS_ALLOW_LIVE", "").lower() in ("1", "true", "yes"),
+            )
         return DaemonConfig(
             dsn=dsn,
             total_slots=int(os.environ.get("TREX_TOTAL_SLOTS", "10")),
             host=os.environ.get("TREX_API_HOST", "127.0.0.1"),
             port=int(os.environ.get("TREX_API_PORT", "8080")),
+            broker=broker,
+            execution_interval_sec=float(os.environ.get("TREX_EXECUTION_INTERVAL_SEC", "1.0")),
+            kis=kis,
         )
diff --git a/trex_core/runtime/daemon.py b/trex_core/runtime/daemon.py
index f851499..2903da4 100644
--- a/trex_core/runtime/daemon.py
+++ b/trex_core/runtime/daemon.py
@@ -1,34 +1,52 @@
-"""Slot-core daemon entrypoint (REQ-005).
+"""Slot-core daemon entrypoint (REQ-005, REQ-012/013/014).
 
-Builds the FastAPI app wired to PostgreSQL adapters, applies migrations and
-preallocates the trading day's slots on startup (lifecycle, not a public
-endpoint), then serves via uvicorn. Console script: `trex-core-daemon`.
+Builds the FastAPI app wired to PostgreSQL adapters + a broker (paper|KIS),
+applies migrations and preallocates slots on startup, runs a background
+execution loop (claim -> submit -> poll -> transition, with restart
+reconciliation), and serves the /v1 API via uvicorn.
+Console script: `trex-core-daemon`.
 """
 from __future__ import annotations
 
+import threading
 from contextlib import asynccontextmanager
 from datetime import datetime, timezone
 
 from fastapi import FastAPI
 
 from trex_core.adapters.api.app import create_app
+from trex_core.adapters.broker.paper import PaperBroker
 from trex_core.adapters.persistence.migrate import apply_migrations
-from trex_core.adapters.persistence.in_memory_intent_store import InMemoryIntentStore  # noqa: F401
 from trex_core.adapters.persistence.postgresql import (
     PostgreSQLIntentStore,
     PostgreSQLSlotRepository,
 )
+from trex_core.application.broker_port import BrokerPort
+from trex_core.application.execution import ExecutionService
 from trex_core.application.intents import IntentService
 from trex_core.domain.slot import SlotService
 from trex_core.runtime.config import DaemonConfig
 
 
+def _build_broker(config: DaemonConfig) -> BrokerPort:
+    if config.broker == "kis":
+        from trex_core.adapters.broker.kis import KISBroker
+
+        k = config.kis
+        return KISBroker(
+            k.account_ref, app_key=k.app_key, app_secret=k.app_secret,
+            base_url=k.base_url, timeout=k.timeout, allow_live=k.allow_live,
+        )
+    return PaperBroker()
+
+
 def build_app(config: DaemonConfig) -> FastAPI:
-    """Construct the daemon app with PostgreSQL adapters + startup lifecycle."""
     slot_repo = PostgreSQLSlotRepository(config.dsn)
     intent_store = PostgreSQLIntentStore(config.dsn)
     slot_service = SlotService(slot_repo)
     intent_service = IntentService(slot_service, slot_repo, intent_store)
+    broker = _build_broker(config)
+    execution = ExecutionService(slot_service, slot_repo, broker)
 
     base = create_app(
         slot_service=slot_service,
@@ -37,14 +55,29 @@ def build_app(config: DaemonConfig) -> FastAPI:
         default_total_slots=config.total_slots,
     )
 
+    stop = threading.Event()
+
+    def _loop() -> None:
+        while not stop.wait(config.execution_interval_sec):
+            try:
+                execution.run_once()
+            except Exception:  # noqa: BLE001 - loop must survive transient errors
+                continue
+
     @asynccontextmanager
     async def lifespan(_: FastAPI):
-        # Startup: migrate schema, preallocate today's slots (idempotent).
         apply_migrations(config.dsn)
-        today = datetime.now(tz=timezone.utc).date()
-        slot_service.preallocate_daily_slots(today, config.total_slots)
-        yield
-        # Shutdown: connection-per-call adapters hold no pooled state to close.
+        slot_service.preallocate_daily_slots(
+            datetime.now(tz=timezone.utc).date(), config.total_slots
+        )
+        execution.reconcile()  # restart recovery before serving (REQ-014)
+        worker = threading.Thread(target=_loop, name="trex-execution", daemon=True)
+        worker.start()
+        try:
+            yield
+        finally:
+            stop.set()
+            worker.join(timeout=config.execution_interval_sec * 3)
 
     base.router.lifespan_context = lifespan
     return base