diff --git a/.doc/ops/CURRENT.md b/.doc/ops/CURRENT.md
index be8c584b..6164f62d 100644
--- a/.doc/ops/CURRENT.md
+++ b/.doc/ops/CURRENT.md
@@ -5,7 +5,7 @@
 
 ## 焦点
 
-1. **MULTI-INTENT HITL**：U3 PG/CAS 已签（[U3 报告](../test-reports/2026-09-15-multi-intent-u3-intentflow-pg-test-report.md)）；下一单元 U4 outbox/投影待认领
+1. **MULTI-INTENT HITL**：U4 outbox/投影进行中（[U4](./short-term/2026-09-16-multi-intent-u4-outbox-projection.md)；[U3 报告](../test-reports/2026-09-15-multi-intent-u3-intentflow-pg-test-report.md)）
 2. **发布门禁**：CI `TEST_DATABASE_URL`、真实 PI 三工作流 E2E、前端人工抽检仍开放（[gap-matrix](../remediation/gap-matrix.md)）
 3. **CHAT-INTENT**：双标签 busy 已签（项目 **6275**）；不删 `sess-p143-u9`；项目 143 只读
 
@@ -13,6 +13,7 @@
 
 | owner | task | branch | worktree | mutex | status |
 |-------|------|--------|----------|-------|--------|
+| Cursor | 2026-09-16-multi-intent-u4-outbox-projection | feature/multi-intent-u4-outbox-projection | - | events | in_progress |
 | Cursor | 2026-09-15-multi-intent-u3-intentflow-pg | feature/multi-intent-u3-intentflow-pg | - | intent-plan | done |
 | Cursor | 2026-09-15-multi-intent-u2-segmenter | feature/multi-intent-u2-segmenter | - | intent | done |
 | Cursor | 2026-09-15-multi-intent-u1-contracts | feature/multi-intent-u1-contracts | - | architecture-docs | done |
diff --git a/.doc/ops/checklists/2026-09-16-multi-intent-u4-outbox-projection.md b/.doc/ops/checklists/2026-09-16-multi-intent-u4-outbox-projection.md
new file mode 100644
index 00000000..3acbe737
--- /dev/null
+++ b/.doc/ops/checklists/2026-09-16-multi-intent-u4-outbox-projection.md
@@ -0,0 +1,19 @@
+---
+title: "多意图 HITL U4 outbox checklist"
+status: in_progress
+created: 2026-09-16
+updated: 2026-09-16
+related_task: "2026-09-16-multi-intent-u4-outbox-projection"
+---
+
+# 多意图 HITL U4 outbox checklist
+
+- [ ] 同 UoW Append intent.plan.*
+- [ ] golden payload 无敏感字段
+- [ ] 重复/乱序/伪造 producer
+- [ ] 投影只前进；跨用户隔离
+- [ ] dispatcher 语义未改；arch-check 绿
+
+## 完成定义
+
+- [ ] 全部勾选且有证据链接
diff --git a/.doc/ops/short-term/2026-09-15-multi-intent-hitl.md b/.doc/ops/short-term/2026-09-15-multi-intent-hitl.md
index 1ace26d5..c0572a25 100644
--- a/.doc/ops/short-term/2026-09-15-multi-intent-hitl.md
+++ b/.doc/ops/short-term/2026-09-15-multi-intent-hitl.md
@@ -3,10 +3,10 @@ title: "多意图持久计划与 HITL（核心 U1–U8，扩面 U9–U12）"
 status: in_progress
 created: 2026-09-15
 updated: 2026-09-15
-owner: 待认领（下一单元 U4）
-branch: "-"
+owner: Cursor（U4）；其余单元待认领
+branch: feature/multi-intent-u4-outbox-projection
 worktree: "-"
-mutex: "-"
+mutex: events
 ---
 
 # 多意图持久计划与 HITL（核心 U1–U8，扩面 U9–U12）
diff --git a/.doc/ops/short-term/2026-09-16-multi-intent-u4-outbox-projection.md b/.doc/ops/short-term/2026-09-16-multi-intent-u4-outbox-projection.md
new file mode 100644
index 00000000..693bbc90
--- /dev/null
+++ b/.doc/ops/short-term/2026-09-16-multi-intent-u4-outbox-projection.md
@@ -0,0 +1,51 @@
+---
+title: "多意图 HITL U4：outbox 与计划投影"
+status: in_progress
+created: 2026-09-16
+updated: 2026-09-16
+owner: Cursor
+branch: feature/multi-intent-u4-outbox-projection
+worktree: "-"
+mutex: events
+---
+
+# 多意图 HITL U4：outbox 与计划投影
+
+## 目标
+
+权威计划在同一 UoW 写入 outbox；投影只应用状态事实；消息/SSE 丢失时 GET PlanView 仍能恢复。不改 dispatcher claim/lease/retry 语义。
+
+## 范围
+
+- Create/Decide/Receipt 同事务 Append `intent.plan.*`
+- 最小 payload + golden；伪造 producer 拒绝
+- projection consumer 幂等、只前进 revision；跨用户不可见
+- ctxmgr 只经 CardProjector 端口（接口在 intentflow，实现可 no-op）
+- 复用 Track E LiveConsumers
+
+## 非目标
+
+- 不改通用 dispatcher
+- 不挂 HTTP（U5）、不改 Web（U6）、不执行动作（U7）
+
+## 步骤
+
+1. [ ] 认领 CURRENT（mutex `events`）
+2. [ ] emit + golden + 投影只前进
+3. [ ] cmd/events 接入 multiplex；goose shadow
+4. [ ] 报告并合回本地 dev
+
+## 验收标准
+
+- [ ] 创建计划产生 awaiting_input；payload 无 prompt/slots
+- [ ] 重复 event_id 不双写投影
+- [ ] 乱序低 revision 不覆盖高 revision
+- [ ] 伪造 producer 拒绝
+- [ ] GET PlanView 不依赖投影成功
+- [ ] arch-check / short 绿
+
+## 相关链接
+
+- 总览: [2026-09-15-multi-intent-hitl.md](./2026-09-15-multi-intent-hitl.md)
+- Checklist: [../checklists/2026-09-16-multi-intent-u4-outbox-projection.md](../checklists/2026-09-16-multi-intent-u4-outbox-projection.md)
+- Test report: [../../test-reports/2026-09-16-multi-intent-u4-outbox-projection-test-report.md](../../test-reports/2026-09-16-multi-intent-u4-outbox-projection-test-report.md)