diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_approval.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_approval.rs
index 9238c6d70..d25a6db2b 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_approval.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/planning_approval.rs
@@ -1579,6 +1579,22 @@ fn plan_gdd_session_matches_receipt(
         })
 }
 
+// 这道门用 `PLAN_GDD_APPROVAL_SOURCE` 识别策划根，而随后的
+// `validate_project_supervisor_plan_root_binding_at` 用 `AGENT_RUNTIME_SUPERVISOR_PLAN_SOURCE`
+// 复核同一条绑定。两个常量分别定义在 planning_storage 与 runtime_driver，值必须相同：
+// 一旦分叉，每个策划根都会先通过识别、再被复核拒掉，全部塌成 needs-reconciliation，
+// 而且没有任何测试会直接指向这个原因。钉成编译期条件。
+const _: () = {
+    let identified = PLAN_GDD_APPROVAL_SOURCE.as_bytes();
+    let validated = AGENT_RUNTIME_SUPERVISOR_PLAN_SOURCE.as_bytes();
+    assert!(identified.len() == validated.len());
+    let mut index = 0;
+    while index < identified.len() {
+        assert!(identified[index] == validated[index]);
+        index += 1;
+    }
+};
+
 fn plan_root_completion_identity_at(
     root: &Path,
     agent_id: &str,
@@ -1587,8 +1603,15 @@ fn plan_root_completion_identity_at(
     if agent_id != GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID || run_id.trim().is_empty() {
         return Ok(false);
     }
+    // 识别只看 run 自己那条绑定记录。链走版本会遍历并校验整条祖先链；把它排在识别
+    // 前面，等于让任何祖先绑定的毛病都先变成 Err，而调用方会把 Err 一律翻成
+    // needs-reconciliation——扣在一个下一行本来就会被判「不是策划根」的 run 头上，让它
+    // 再也收束不了。被误伤的只可能是非策划 run：真正的策划根无父（下面
+    // `validate_project_supervisor_plan_root_binding_at` 强制 parent 必须为空），链走
+    // 对它本就是空转。两个入口对同一个 (agent, run) 返回的绑定值完全相同，差别仅在于
+    // 是否顺带校验祖先链，所以识别判据一字未变。
     let Some(binding) =
-        read_game_creator_agent_runtime_run_profile_binding(root, agent_id, run_id)?
+        read_game_creator_agent_runtime_run_profile_binding_once(root, agent_id, run_id.trim())?
     else {
         return Ok(false);
     };
@@ -1597,6 +1620,8 @@ fn plan_root_completion_identity_at(
     {
         return Ok(false);
     }
+    // 确认是策划根之后才走完整父链：严格度一点没降——
+    // `validate_project_supervisor_plan_root_binding_at` 内部读的就是链走版本。
     let binding = validate_project_supervisor_plan_root_binding_at(root, agent_id, run_id)?;
     let runtime = read_game_creator_agent_runtime_at(root, agent_id)?.state;
     if runtime.run_id != run_id
@@ -2053,4 +2078,69 @@ mod tests {
         );
         let _ = fs::remove_dir_all(root);
     }
+
+    /// 祖先绑定坏掉不能让一个跟立项策划无关的 supervisor run 被判成「策划根身份不明」。
+    ///
+    /// `plan_root_completion_identity_at` 读绑定走的是会遍历完整父链的入口，而识别
+    /// Fast GDD 只看 run 自己那条记录的 source/profile。链走排在识别前面，于是任何
+    /// 祖先绑定的问题都先变成 Err，再被完成门统一翻成 needs-reconciliation——扣在一个
+    /// 下一行就会被判为「不是策划根」的 run 头上，让它再也收束不了。
+    ///
+    /// 真正的策划根没有父（`validate_project_supervisor_plan_root_binding_at` 强制
+    /// parent 必须为空），所以链走对它本来就是空转；会被链走误伤的只可能是非策划 run。
+    #[test]
+    fn broken_ancestor_binding_must_not_make_a_non_plan_supervisor_run_a_plan_root_suspect() {
+        let root = std::env::temp_dir().join(format!(
+            "genarrative-plan-root-identity-{}",
+            uuid::Uuid::new_v4().simple()
+        ));
+        init_local_game_project_at(&root, "project-test-plan-root", "plan root identity")
+            .expect("init project");
+
+        let parent_run_id = "p4-isolated-join-parent";
+        let child_run_id = "p4-isolated-join-child";
+        bind_game_creator_agent_runtime_run_profile_at(
+            &root,
+            GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID,
+            parent_run_id,
+            AGENT_RUNTIME_SUPERVISOR_PLAN_SOURCE,
+            Some(AGENT_RUNTIME_RUN_PROFILE_STANDARD),
+            None,
+        )
+        .expect("bind ancestor run");
+        bind_game_creator_agent_runtime_run_profile_at(
+            &root,
+            GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID,
+            child_run_id,
+            AGENT_RUNTIME_ISOLATED_JOIN_SOURCE,
+            Some(AGENT_RUNTIME_RUN_PROFILE_STANDARD),
+            Some(&AgentRuntimeTaskLink {
+                parent_agent_id: Some(GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID.to_string()),
+                parent_run_id: Some(parent_run_id.to_string()),
+                delegation_id: None,
+            }),
+        )
+        .expect("bind isolated-join child run");
+
+        // 破坏祖先：子记录仍带着 parentBindingFingerprint，父绑定却没了，正好命中
+        // 父链遍历里的「父绑定缺失」。子 run 自己那条记录始终是完好可读的。
+        fs::remove_file(game_creator_agent_runtime_run_profile_binding_path(
+            &root,
+            GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID,
+            parent_run_id,
+        ))
+        .expect("remove ancestor binding");
+
+        let blocker = plan_gdd_typed_completion_blocker_at_locked(
+            &root,
+            GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID,
+            child_run_id,
+        );
+        assert!(
+            blocker.is_none(),
+            "isolated-join run 的 source 不是立项策划，完成门不该拦它，更不该说它策划根身份不明：{:?}",
+            blocker.map(|blocker| blocker.kind)
+        );
+        let _ = fs::remove_dir_all(root);
+    }
 }