feat(chat): bind attached sessions to GoalRef

docs/architecture/rfcs/goal-instance-identity-and-orphan-recovery-v0.md

@@ -769,6 +769,20 @@ promotion retain their own acceptance. No new paid cohort or soak is authorized.
   qualify the remaining effect owners before existing-project activation or
   global routing can open.
 
+### 2026-09-26: M3 attached-host Chat candidate
+
+- **Baseline:** `9849366c6`.
+- **Proposed:** Bind attached Chat sessions to the current exact GoalRef and
+  recheck it for enqueue, resume, and new claims under the M2 lifetime guard.
+  A delayed result may complete only when its persisted claim admission still
+  matches the historical session.
+- **Compatibility:** Non-source profiles keep the existing writers, lookup,
+  broker payloads, and serialized bytes. Clients do not submit
+  `goal_instance_id`.
+- **Remaining hold:** This qualifies only `attached_host_chat_session`.
+  Managed provider startup and downstream host effects remain blocked by the
+  separate `first_party_host_runtime` row and the overall M3 activation hold.
+
 ### 2026-09-27: first-party Host runtime partial enforcement
 
 - **Baseline:** `fd96e5e2574272262b9ea604a96581a0d20e94d1`

docs/architecture/rfcs/goal-instance-identity-and-orphan-recovery-v0.zh-CN.md

@@ -698,6 +698,18 @@ service adoption、D1–D3 provider promotion 保留各自验收。不授权付
 - **剩余 hold：** 所有结果均为 `execution_authority: false`。M3 必须先完成其余
   effect owner 资格化，才能开放既有项目 activation 或 global routing。
 
+### 2026-09-26：M3 attached-host Chat 候选
+
+- **基线：** `9849366c6`。
+- **候选实现：** attached Chat Session 绑定当前精确 GoalRef；enqueue、resume
+  与新 claim 在 M2 lifetime guard 内重新校验。迟到结果只有在持久化 claim
+  admission 仍与历史 Session 一致时才能完成。
+- **兼容性：** 非 source profile 保留既有 writer、lookup、broker payload 与
+  序列化字节；客户端不提交 `goal_instance_id`。
+- **剩余 hold：** 本切片只资格化 `attached_host_chat_session`。Managed
+  provider 启动和下游 host effect 仍受独立 `first_party_host_runtime` 行与
+  M3 总 activation hold 阻断。
+
 ### 2026-09-27：第一方 Host runtime 部分 enforcement
 
 - **基线：** `fd96e5e2574272262b9ea604a96581a0d20e94d1`