docs: integrate session settlement recovery

.project-docs/30-worklog/current-state.md

@@ -4,6 +4,16 @@ This file is the integrated default-branch snapshot. Feature tasks record progre
 
 ## Integrated Through
 
+- Coding terminal-settlement source `f1fd13a` from task
+  `20260901-fix-session-settlement-a47d2e91` is integrated through merge
+  `e76a1e1` by task `20260902-integrate-session-settlement-6e41c8b2`.
+  Normal prompt completion still uses authoritative `agent_settled`; when that
+  handshake is missing after Pi has terminalized, Main probes only the accepted
+  target thread after a bounded 30-second grace period. Exact idle evidence
+  hydrates the persisted final assistant response and releases ownership once;
+  contradictory state becomes an explicit target-only protocol failure. Accepted
+  or uncertain mutations are never replayed, and sibling Conversations remain
+  available.
 - Plugin-navigation sources `b3f4166` and `e237941` from task
   `20260831-consolidate-plugin-navigation-3d9a6c71` are integrated through
   merge `a278ca3`. Coding history/quota source `d523b72` from task
@@ -241,6 +251,12 @@ Robot 绑定设备默认先显示“引导配网 / 已有激活码”路径选
 
 ## Recently Completed
 
+- 2026-09-02: Integrated bounded recovery for a missing Pi prompt settlement.
+  A final persisted assistant response can no longer leave the Composer permanently
+  processing merely because `agent_settled` was lost: Main waits for the normal
+  handshake, then uses exact target-thread idle evidence to hydrate and settle once,
+  or emits a safe target-only protocol failure. Focused runtime/process tests,
+  typecheck, and the Vite/Electron production build passed on the integrated tree.
 - 2026-09-01: Integrated the consolidated Plugin Services navigation, complete
   active-branch Coding history with scroll-anchor preservation, narrow Token Point
   quota feedback, and stable first-line process previews. Combined typecheck,
@@ -330,4 +346,4 @@ Robot 绑定设备默认先显示“引导配网 / 已有激活码”路径选
 
 ## Last Updated
 
-2026-09-01
+2026-09-02