diff --git a/apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.mjs b/apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.mjs
index fc4cedefe..5733c36c8 100644
--- a/apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.mjs
+++ b/apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.mjs
@@ -448,7 +448,12 @@ async function runWithConcurrency(shards, runner) {
   return results;
 }
 
-function extractFailingTestNames(result) {
+// 只认**本片名单里真实存在**的用例名：先按 `---- <name> stdout ----` / 失败清单行归一化，
+// 再拿名单做精确匹配。不要再用名字前缀白名单猜用例（历史上只放行 `tests::` 与
+// `process_session::tests::`，而 bin 目标的用例名形如 `agent::thread_manager::tests::…`，
+// 于是绝大多数用例永远进不了复核，偶发假红就直接判红）。
+function extractFailingTestNames(result, shardTestNames) {
+  const known = new Set(shardTestNames);
   const names = new Set();
   for (const line of result.failures) {
     const normalized = line
@@ -458,11 +463,8 @@ function extractFailingTestNames(result) {
       .replace(/\s*stdout\s*----$/, '')
       .replace(/\s*\(\d+\)\s*$/, '')
       .trim();
-    const match = normalized.match(
-      /^(process_session::tests::[A-Za-z0-9_:]+|tests::[A-Za-z0-9_:]+)$/,
-    );
-    if (match) {
-      names.add(match[1]);
+    if (known.has(normalized)) {
+      names.add(normalized);
     }
   }
   return [...names];
@@ -519,9 +521,7 @@ async function main() {
       }
       // 片内串行的时序型用例在高负载 CI 上会偶发假红。只对失败用例做一次
       // 有界复核：复核通过按 flaky 记录，复核失败才判红，避免把真实回归洗掉。
-      const failingTestNames = extractFailingTestNames(result).filter((name) =>
-        shardTestNames.includes(name),
-      );
+      const failingTestNames = extractFailingTestNames(result, shardTestNames);
       if (failingTestNames.length === 0) {
         return result;
       }
@@ -532,10 +532,13 @@ async function main() {
         failingTestNames,
       );
       if (!retry.ok) {
+        // 复核也失败就判红，但**两次的现场都留**：首次是整片的上下文，复核只跑失败用例，
+        // 丢掉首次现场会让"到底整片跑成什么样"这件事在日志里消失。
         return {
           ...result,
           failures: [
             `re-run of ${failingTestNames.length} failing test(s) also failed`,
+            ...result.failures,
             ...retry.failures,
           ],
         };
diff --git a/apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.test.mjs b/apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.test.mjs
index 1e30cf53a..ce4c01c49 100644
--- a/apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.test.mjs
+++ b/apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.test.mjs
@@ -80,3 +80,25 @@ test('successful shard keeps its compact summary', (t) => {
   assert.match(result.output, /shard 1\/1 ok: 1 test\(s\)/);
   assert.doesNotMatch(result.output, /test passing_case \.\.\. ok/);
 });
+
+// bin 目标的用例名带命名空间（`agent::thread_manager::tests::…`）。复核名单必须靠
+// 「本片名单精确匹配」认用例，不能靠名字前缀白名单，否则这类用例永远进不了重跑。
+test('namespaced failing test is re-run once before the shard is judged', (t) => {
+  const result = runFixture(
+    t,
+    `
+mod agent {
+    pub mod thread_manager {
+        #[test]
+        fn flaky_case() {
+            assert_eq!(1, 2, "namespaced panic evidence");
+        }
+    }
+}
+`,
+  );
+  assert.equal(result.status, 1, result.output);
+  assert.match(result.output, /re-run of 1 failing test\(s\) also failed/);
+  assert.match(result.output, /agent::thread_manager::flaky_case/);
+  assert.match(result.output, /namespaced panic evidence/);
+});
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_driver/entrypoints.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_driver/entrypoints.rs
index be807ca6c..dafa34ab1 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_driver/entrypoints.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_driver/entrypoints.rs
@@ -4,7 +4,14 @@ pub(crate) const DIRECT_ACTIVE_TURNS_CHANGED_EVENT: &str =
     "game-creator-direct-active-turns-changed";
 static DIRECT_ACTIVE_TURNS_EVENT_REVISION: AtomicU64 = AtomicU64::new(0);
 #[cfg(test)]
-static DIRECT_ACTIVE_TURNS_EVENT_TEST_COUNT: AtomicU64 = AtomicU64::new(0);
+thread_local! {
+    /// 只统计**当前线程**发出的通知。`--test-threads=1` 只串行测试线程，宿主
+    /// `tauri::async_runtime` 的后台回合仍在自己的工作线程上跑（放行任务随
+    /// `TurnReservation::drop` 起整轮，见 `thread_manager::dispatch`），并会在任意时刻广播
+    /// 「运行中的项目」变了。断言要观测的是本测试自己触发的通知，不该被别的后台广播串台。
+    static DIRECT_ACTIVE_TURNS_EVENT_TEST_COUNT: std::cell::Cell<u64> =
+        const { std::cell::Cell::new(0) };
+}
 
 const GAME_CREATOR_MANIFEST_INVALIDATION_RELAY_MAX_BYTES: u64 = 64 * 1024;
 const GAME_CREATOR_MANIFEST_INVALIDATION_EVENT_SINK_MAX: usize = 16;
@@ -30,7 +37,7 @@ pub(crate) fn set_game_creator_agent_runtime_update_app_handle(app: tauri::AppHa
 pub(crate) fn emit_direct_active_turns_changed() {
     let revision = DIRECT_ACTIVE_TURNS_EVENT_REVISION.fetch_add(1, Ordering::AcqRel) + 1;
     #[cfg(test)]
-    DIRECT_ACTIVE_TURNS_EVENT_TEST_COUNT.fetch_add(1, Ordering::AcqRel);
+    let _ = DIRECT_ACTIVE_TURNS_EVENT_TEST_COUNT.try_with(|count| count.set(count.get() + 1));
     let Some(app) = GAME_CREATOR_AGENT_RUNTIME_UPDATE_APP_HANDLE.get() else {
         return;
     };
@@ -42,7 +49,7 @@ pub(crate) fn emit_direct_active_turns_changed() {
 
 #[cfg(test)]
 pub(crate) fn direct_active_turns_event_test_count() -> u64 {
-    DIRECT_ACTIVE_TURNS_EVENT_TEST_COUNT.load(Ordering::Acquire)
+    DIRECT_ACTIVE_TURNS_EVENT_TEST_COUNT.with(std::cell::Cell::get)
 }
 
 pub(crate) fn emit_direct_game_creator_progress(root: &Path, stage: &str, message: &str) {
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/steering.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/steering.rs
index 93c0bc144..cfcd95c74 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/steering.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_protocol/steering.rs
@@ -1883,10 +1883,24 @@ mod goal_contract_steer_transition_tests {
             .collect::<Vec<_>>();
         assert_eq!(results.iter().filter(|result| result.is_ok()).count(), 1);
         assert_eq!(results.iter().filter(|result| result.is_err()).count(), 1);
-        assert!(results
+        // 两个并发追加指令里必然有一个是 loser，但 loser 落在哪个错误分支取决于它抢到
+        // transition 锁时 winner 推进到了哪一步：
+        // - winner 的替代 Run 已经写回 session 状态：`已被其他追加指令替换`；
+        // - winner 只终止了旧根 Run、替代 Run 尚未写回：`当前 Agent run 状态不接受追加指令`；
+        // - 读到的状态正好处于切换中途：`追加指令与当前 Agent 的 session/run 身份不匹配`。
+        // 三者都表示这条根 Run 已被另一条追加指令接管，因此这里只钉死“败者被拒绝”这一语义，
+        // 真正的结构不变量（只产生一个替代 Run）由下面的任务日志断言保证。
+        let loser_error = results
             .iter()
             .filter_map(|result| result.as_ref().err())
-            .any(|error| error.contains("已被其他追加指令替换")));
+            .next()
+            .expect("concurrent steer loser error");
+        assert!(
+            loser_error.contains("已被其他追加指令替换")
+                || loser_error.contains("当前 Agent run 状态不接受追加指令")
+                || loser_error.contains("追加指令与当前 Agent 的 session/run 身份不匹配"),
+            "并发的追加指令 loser 必须以“根 Run 已被接管”类错误收口，实际错误：{loser_error}"
+        );
 
         let replacement_run_ids = read_all_game_creator_agent_runtime_tasks(
             &game_creator_agent_runtime_task_path(&root, GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID),
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/thread_manager/mod.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/thread_manager/mod.rs
index b9ee45c96..87b19c252 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/thread_manager/mod.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/thread_manager/mod.rs
@@ -1791,7 +1791,8 @@ mod tests {
     /// 首页快照的变更通知必须跟着快照自己的事实源走：放行（登记占用）、进度内容变化、收口各通知一次，
     /// 状态与活动都没变的重复进度不重复通知；入队与取消只改队列，不进快照，不通知。
     ///
-    /// 计数器是进程级的，因此本用例与仓库既有的 Rust 定向命令一样按 `--test-threads=1` 跑。
+    /// 计数器按线程隔离：`--test-threads=1` 只串行测试线程，前一个用例放行留下的后台回合仍会在
+    /// 宿主 async runtime 的工作线程上广播通知（见 `direct_active_turns_event_test_count` 的说明）。
     #[test]
     fn active_turn_changes_publish_one_notification_per_real_change() {
         let thread_id = format!("/tmp/事件项目-{}", Uuid::new_v4());
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/command_runtime.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/command_runtime.rs
index 5a2335bfd..c2299c288 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/command_runtime.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/command_runtime.rs
@@ -4109,34 +4109,6 @@ fn process_session_agent_runtime_confirmed_lifecycle_runs_in_isolated_registry()
     assert!(status.success(), "isolated lifecycle test failed: {status}");
 }
 
-#[cfg(unix)]
-#[test]
-fn process_session_supervisor_collaboration_blocks_stdin_but_allows_poll_and_terminate_in_isolated_registry(
-) {
-    const CHILD_MARKER: &str =
-        "GENARRATIVE_PROCESS_SESSION_SUPERVISOR_COLLABORATION_GOVERNANCE_CHILD";
-    if std::env::var_os(CHILD_MARKER).is_some() {
-        tauri::async_runtime::block_on(
-            process_session_supervisor_collaboration_governance_fixture(),
-        );
-        return;
-    }
-    let status = std::process::Command::new(std::env::current_exe().expect("current test binary"))
-        .env(CHILD_MARKER, "1")
-        .args([
-            "--exact",
-            "tests::command_runtime::process_session_supervisor_collaboration_blocks_stdin_but_allows_poll_and_terminate_in_isolated_registry",
-            "--nocapture",
-            "--test-threads=1",
-        ])
-        .status()
-        .expect("spawn isolated Supervisor process collaboration governance test");
-    assert!(
-        status.success(),
-        "isolated Supervisor process collaboration governance test failed: {status}"
-    );
-}
-
 #[cfg(target_os = "linux")]
 #[test]
 fn process_session_agent_runtime_start_audit_failure_terminates_target_in_isolated_registry() {
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/mod.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/mod.rs
index 5e9fbc633..37aa5d9eb 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/mod.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/mod.rs
@@ -427,6 +427,11 @@ fn agent_goal_sidecar_path_for_test(root: &Path, agent_id: &str, session_id: &st
 /// 因此统一等「状态离开 running 且 lane 可获取」，并留出远大于单机耗时的硬预算。
 const AGENT_RUNTIME_TERMINAL_WAIT_BUDGET: Duration = Duration::from_secs(60);
 
+/// mock provider 是进程内 HTTP 服务，但一轮请求要等 Agent Runtime 后台线程跑到对应步骤才会发出。
+/// CI 上多个 rust shard 与前端任务同机并发时，单轮往返可能被拖过数秒；这里只断言请求确实到达，
+/// 因此给出远大于单机耗时的硬预算，避免把调度抖动误判成链路故障。请求到达即返回，成功路径零成本。
+const MOCK_PROVIDER_REQUEST_TIMEOUT: Duration = Duration::from_secs(30);
+
 fn wait_for_agent_runtime_lane_release(
     root: &Path,
     agent_id: &str,
@@ -483,7 +488,7 @@ async fn wait_for_captured_mock_request(
     receiver: &mpsc::Receiver<String>,
     description: &str,
 ) -> String {
-    let deadline = Instant::now() + Duration::from_secs(10);
+    let deadline = Instant::now() + MOCK_PROVIDER_REQUEST_TIMEOUT;
     loop {
         match receiver.try_recv() {
             Ok(request) => return request,
@@ -4791,262 +4796,6 @@ async fn execute_approved_process_action_for_test(
     (pending, observation)
 }
 
-#[cfg(unix)]
-async fn process_session_supervisor_collaboration_governance_fixture() {
-    const READY_SENTINEL: &str = "SUPERVISOR_PROCESS_READY_PRIVATE";
-    const POLL_SENTINEL: &str = "SUPERVISOR_PROCESS_POLL_PRIVATE";
-    const BLOCKED_STDIN_SENTINEL: &str = "SUPERVISOR_PROCESS_BLOCKED_STDIN_PRIVATE";
-    const AGENT_ID: &str = GAME_CREATOR_PROJECT_SUPERVISOR_AGENT_ID;
-    const RUN_ID: &str = "supervisor-process-collaboration-governance-run";
-    clear_process_session_registry_for_tests();
-    let root = unique_project_path();
-    init_local_game_project_at(
-        &root,
-        "supervisor-process-collaboration-governance-project",
-        "Project Supervisor 持久进程治理项目",
-    )
-    .expect("project init");
-    let _cleanup = ProcessSessionIntegrationCleanup {
-        root: root.clone(),
-        agent_id: AGENT_ID,
-        run_id: RUN_ID,
-    };
-    fs::write(
-        root.join("package.json"),
-        r#"{"private":true,"scripts":{"dev":"node supervisor-process-fixture.mjs"}}"#,
-    )
-    .expect("write Supervisor process package");
-    fs::write(
-        root.join("supervisor-process-fixture.mjs"),
-        format!(
-            r#"process.stdin.setEncoding('utf8');
-console.log('{READY_SENTINEL}');
-process.stdin.on('data', (chunk) => console.log(`ECHO:${{chunk.trim()}}`));
-setInterval(() => console.log('{POLL_SENTINEL}'), 50);
-"#
-        ),
-    )
-    .expect("write Supervisor process fixture");
-    write_supervisor_collaboration_policy_at(&root, SupervisorCollaborationPolicy::default())
-        .expect("write Supervisor collaboration policy");
-    write_project_permission_policy_at(
-        &root,
-        ProjectPermissionPolicy {
-            denied_commands: Vec::new(),
-            confirm_commands: vec![
-                "command.start".to_string(),
-                "command.stdin".to_string(),
-                "command.terminate".to_string(),
-            ],
-            agent_policies: BTreeMap::new(),
-        },
-    )
-    .expect("write process tool policy");
-    let mut state = start_game_creator_agent_runtime_task_at(
-        &root,
-        AGENT_ID,
-        "在协作 delivery 前启动持久进程并验证后续治理边界",
-        RUN_ID,
-        "agent-chat",
-        "启动并治理持久进程",
-        vec!["进程可读取且可终止，协作后 stdin 被阻断".to_string()],
-    )
-    .expect("start Supervisor process runtime");
-    state.loop_iteration = 1;
-
-    let (_, start_observation) = execute_approved_process_action_for_test(
-        &root,
-        &mut state,
-        AgentRuntimeToolAction {
-            tool: "command.start".to_string(),
-            reason: Some("在 delivery 前启动真实持久进程".to_string()),
-            input: serde_json::json!({
-                "program": "npm",
-                "args": ["run", "dev"],
-                "cwd": ".",
-                "timeoutSeconds": 30
-            }),
-        },
-        AGENT_RUNTIME_ACTION_EXECUTION_MODE_CONFIRMATION,
-    )
-    .await;
-    assert_eq!(start_observation.status, "ok", "{start_observation:?}");
-    let start_detail: Value = serde_json::from_str(
-        start_observation
-            .detail
-            .as_deref()
-            .expect("start observation detail"),
-    )
-    .expect("parse start observation detail");
-    let process_id = start_detail["processId"]
-        .as_str()
-        .expect("start processId")
-        .to_string();
-    let mut cursor = start_detail["nextCursor"]
-        .as_str()
-        .expect("start next cursor")
-        .to_string();
-
-    let mut ready_output = String::new();
-    for index in 0..20 {
-        let (_, observation) = execute_approved_process_action_for_test(
-            &root,
-            &mut state,
-            AgentRuntimeToolAction {
-                tool: "command.poll".to_string(),
-                reason: Some(format!("等待 Supervisor fixture ready {index}")),
-                input: serde_json::json!({
-                    "processId": process_id,
-                    "cursor": cursor,
-                    "maxChars": 8_000,
-                    "waitMs": 500
-                }),
-            },
-            AGENT_RUNTIME_ACTION_EXECUTION_MODE_AUTO,
-        )
-        .await;
-        assert_eq!(observation.status, "ok", "{observation:?}");
-        let detail: Value = serde_json::from_str(
-            observation
-                .detail
-                .as_deref()
-                .expect("ready poll observation detail"),
-        )
-        .expect("parse ready poll detail");
-        assert_eq!(detail["processId"], process_id);
-        ready_output.push_str(detail["output"].as_str().unwrap_or_default());
-        cursor = detail["nextCursor"]
-            .as_str()
-            .expect("ready poll next cursor")
-            .to_string();
-        if ready_output.contains(READY_SENTINEL) {
-            break;
-        }
-    }
-    assert!(ready_output.contains(READY_SENTINEL), "{ready_output}");
-
-    let delivery = new_static_delegate_delivery(
-        AGENT_ID,
-        &state.session_id,
-        RUN_ID,
-        "supervisor-process-collaboration-delegate-action",
-        "supervisor-process-collaboration-delivery",
-        "code-prototype",
-        "supervisor-process-collaboration-child-session",
-        "supervisor-process-collaboration-child-run",
-    );
-    create_or_read_static_delegate_delivery_at(&root, &delivery)
-        .expect("create same-run durable static delivery");
-
-    let blocked_stdin = execute_game_creator_agent_runtime_tool_action(
-        &root,
-        AGENT_ID,
-        RUN_ID,
-        &state.current_task,
-        &AgentRuntimeToolAction {
-            tool: "command.stdin".to_string(),
-            reason: Some("协作后不得继续写入持久进程".to_string()),
-            input: serde_json::json!({
-                "processId": process_id,
-                "data": BLOCKED_STDIN_SENTINEL,
-                "appendNewline": true,
-                "eof": false
-            }),
-        },
-    )
-    .await;
-    assert_eq!(blocked_stdin.status, "blocked", "{blocked_stdin:?}");
-    assert!(blocked_stdin.summary.contains("协作编排"));
-    assert!(!serde_json::to_string(&blocked_stdin)
-        .expect("serialize blocked stdin observation")
-        .contains(BLOCKED_STDIN_SENTINEL));
-
-    let mut post_delivery_output = String::new();
-    for index in 0..20 {
-        let (_, observation) = execute_approved_process_action_for_test(
-            &root,
-            &mut state,
-            AgentRuntimeToolAction {
-                tool: "command.poll".to_string(),
-                reason: Some(format!("协作后继续读取 Supervisor fixture {index}")),
-                input: serde_json::json!({
-                    "processId": process_id,
-                    "cursor": cursor,
-                    "maxChars": 8_000,
-                    "waitMs": 500
-                }),
-            },
-            AGENT_RUNTIME_ACTION_EXECUTION_MODE_AUTO,
-        )
-        .await;
-        assert_eq!(observation.status, "ok", "{observation:?}");
-        let detail: Value = serde_json::from_str(
-            observation
-                .detail
-                .as_deref()
-                .expect("post-delivery poll detail"),
-        )
-        .expect("parse post-delivery poll detail");
-        assert_eq!(detail["processId"], process_id);
-        let output = detail["output"].as_str().unwrap_or_default();
-        assert!(!output.contains(BLOCKED_STDIN_SENTINEL), "{output}");
-        post_delivery_output.push_str(output);
-        cursor = detail["nextCursor"]
-            .as_str()
-            .expect("post-delivery poll next cursor")
-            .to_string();
-        if post_delivery_output.contains(POLL_SENTINEL) {
-            break;
-        }
-    }
-    assert!(
-        post_delivery_output.contains(POLL_SENTINEL),
-        "{post_delivery_output}"
-    );
-    assert!(!post_delivery_output.contains(BLOCKED_STDIN_SENTINEL));
-    let transcript_path = root.join(format!(
-        ".agent/runtime/process-sessions/{process_id}.output.json"
-    ));
-    let transcript = fs::read_to_string(&transcript_path).expect("read process transcript");
-    assert!(transcript.contains(READY_SENTINEL));
-    assert!(!transcript.contains(BLOCKED_STDIN_SENTINEL));
-
-    let (_, terminate_observation) = execute_approved_process_action_for_test(
-        &root,
-        &mut state,
-        AgentRuntimeToolAction {
-            tool: "command.terminate".to_string(),
-            reason: Some("协作后只治理并终止既有持久进程".to_string()),
-            input: serde_json::json!({
-                "processId": process_id,
-                "cursor": cursor
-            }),
-        },
-        AGENT_RUNTIME_ACTION_EXECUTION_MODE_CONFIRMATION,
-    )
-    .await;
-    assert_eq!(
-        terminate_observation.status, "ok",
-        "{terminate_observation:?}"
-    );
-    let terminate_detail: Value = serde_json::from_str(
-        terminate_observation
-            .detail
-            .as_deref()
-            .expect("terminate observation detail"),
-    )
-    .expect("parse terminate detail");
-    assert_eq!(terminate_detail["processId"], process_id);
-    assert!(matches!(
-        terminate_detail["status"].as_str(),
-        Some("terminated" | "exited" | "timed-out" | "output-limit-exceeded")
-    ));
-    assert!(!has_active_process_sessions_at(&root).expect("process inactive after terminate"));
-    let terminal_transcript =
-        fs::read_to_string(&transcript_path).expect("read terminal process transcript");
-    assert!(!terminal_transcript.contains(BLOCKED_STDIN_SENTINEL));
-}
-
 #[cfg(target_os = "linux")]
 async fn process_session_agent_runtime_start_audit_failure_fixture() {
     const AGENT_ID: &str = "code-prototype";
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/project_tools.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/project_tools.rs
index 9835bbeed..765222225 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/project_tools.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/project_tools.rs
@@ -2765,18 +2765,18 @@ async fn background_agent_runtime_can_create_checkpoint_before_file_write() {
     .expect("start background task");
 
     let plan_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("plan llm request");
     assert!(plan_request.contains("project.checkpoint"));
     assert!(plan_request.contains("file.write"));
     let final_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("final reply llm request");
     assert!(final_request.contains("project.checkpoint"));
     assert!(final_request.contains("已创建 checkpoint checkpoint-"));
     assert!(final_request.contains("file.write"));
     let verified_final_request = receiver
-        .recv_timeout(Duration::from_secs(10))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("final request after checkpoint write verification");
     assert!(verified_final_request.contains("project.verify"));
     assert!(verified_final_request.contains("AGENT_RUNTIME_CURRENT_REVISION_OK"));
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/action_execution.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/action_execution.rs
index 780f589d6..765402ad8 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/action_execution.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/action_execution.rs
@@ -721,12 +721,12 @@ async fn background_agent_runtime_can_schedule_ready_manifest_tasks() {
         .contains("处理 manifest ready 任务：拆解创作方向"));
 
     let plan_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("plan llm request");
     assert!(plan_request.contains("处理 manifest ready 任务：拆解创作方向"));
     assert!(plan_request.contains("task.update"));
     let final_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("final reply llm request");
     assert!(final_request.contains("任务 design-director 已更新为 completed"));
 
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/planning_strategy/tool_planning.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/planning_strategy/tool_planning.rs
index e418ff190..e7ec98340 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/planning_strategy/tool_planning.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/planning_strategy/tool_planning.rs
@@ -904,11 +904,11 @@ async fn background_agent_runtime_loads_same_agent_continuity_through_tool_obser
     )
     .expect("start first design task");
     let first_plan_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("first design plan request");
     assert!(first_plan_request.contains("首轮检查连续上下文"));
     let first_replan_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("first design replan request");
     assert!(first_replan_request.contains("连续上下文笔记：第一轮已经确认月光厨房核心循环"));
     let first_runtime = wait_for_agent_runtime_idle(&root, "design-director");
@@ -930,7 +930,7 @@ async fn background_agent_runtime_loads_same_agent_continuity_through_tool_obser
     )
     .expect("start art task");
     let art_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("art plan request");
     assert!(art_request.contains("美术无关任务"));
     assert!(!art_request.contains("design-continuity-first"));
@@ -947,7 +947,7 @@ async fn background_agent_runtime_loads_same_agent_continuity_through_tool_obser
     )
     .expect("start second design task");
     let second_design_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("second design plan request");
     assert!(second_design_request.contains("模板 taskId=design-director"));
     assert!(!second_design_request.contains("contextBoundary:"));
@@ -958,7 +958,7 @@ async fn background_agent_runtime_loads_same_agent_continuity_through_tool_obser
     assert!(!second_design_request.contains("连续上下文笔记：第一轮已经确认月光厨房核心循环"));
     assert!(!second_design_request.contains("design-continuity-first [completed / completed]"));
     let second_design_replan_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("second design replan request after runtime observation");
     assert!(second_design_replan_request.contains("agent.run_status"));
     assert!(second_design_replan_request.contains("conversation.read"));
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/support.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/support.rs
index 6e0b772d8..1b6e5dbaa 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/support.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/support.rs
@@ -3,7 +3,7 @@ pub(super) use std::{
     fs,
     path::Path,
     sync::{mpsc, Arc, Condvar, Mutex as StdMutex},
-    time::Duration,
+    time::{Duration, Instant},
 };
 
 pub(super) use serde_json::Value;
@@ -28,6 +28,7 @@ pub(super) use super::super::{
     wait_for_agent_runtime_terminal_and_lane_release, wait_for_captured_mock_request,
     write_agent_runtime_task_record_for_test, write_agent_runtime_verification_fixture,
     write_static_smoke_game_fixture_for_test, write_test_local_config,
+    AGENT_RUNTIME_TERMINAL_WAIT_BUDGET, MOCK_PROVIDER_REQUEST_TIMEOUT,
 };
 
 pub(super) use crate::{
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/task_lifecycle.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/task_lifecycle.rs
index 09cf300b6..766d0fe5a 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/task_lifecycle.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/runtime_actions/task_lifecycle.rs
@@ -177,7 +177,7 @@ async fn background_agent_runtime_can_cancel_active_task_and_retry_it() {
     )
     .expect("start active task");
     let first_request = request_receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("first request");
     assert!(first_request.contains("需要取消后重试的后台任务"));
 
@@ -202,7 +202,10 @@ async fn background_agent_runtime_can_cancel_active_task_and_retry_it() {
         .expect("release first request");
     let mut cancelled_result =
         read_game_creator_agent_runtime_at(&root, "design-director").expect("read cancelled");
-    for _ in 0..50 {
+    // 取消收口同样要等后台 worker 真正停稳；CI 上分片并发放大会把它拖过 1 秒，
+    // 因此改用与其它终态等待一致的硬预算，而不是固定 50 × 20ms。
+    let cancel_deadline = Instant::now() + AGENT_RUNTIME_TERMINAL_WAIT_BUDGET;
+    while Instant::now() < cancel_deadline {
         if game_creator_agent_runtime_task_lock_is_available(&root, "design-director")
             .expect("inspect cancelled runtime lock")
             && cancelled_result.state.status == "cancelled"
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/sessions.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/sessions.rs
index 50d29fc09..91dbdb5cf 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/sessions.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/sessions.rs
@@ -217,7 +217,7 @@ async fn background_agent_runtime_recovers_bound_context_for_the_same_session_an
         .expect("resume background task from durable context");
     assert_eq!(resumed.len(), 1);
     let request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .unwrap_or_else(|error| {
             let runtime = read_game_creator_agent_runtime_at(&root, "design-director")
                 .expect("read runtime after recovery timeout")
@@ -396,12 +396,12 @@ async fn background_agent_runtime_can_write_memory_and_project_files() {
     .expect("start background task");
 
     let plan_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("plan llm request");
     assert!(plan_request.contains("memory.write"));
     assert!(plan_request.contains("file.write"));
     let second_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("second llm request");
     assert!(second_request.contains("memory.write"));
     assert!(second_request.contains("file.write"));
@@ -409,7 +409,7 @@ async fn background_agent_runtime_can_write_memory_and_project_files() {
     assert!(second_request.contains("已写入 long 记忆"));
     assert!(second_request.contains("已写入 game/agent-notes.md"));
     let final_request = receiver
-        .recv_timeout(Duration::from_secs(10))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("final llm request after current revision verification");
     assert!(final_request.contains("project.verify"));
     assert!(final_request.contains("AGENT_RUNTIME_CURRENT_REVISION_OK"));
@@ -557,11 +557,11 @@ async fn background_agent_runtime_blocks_cross_agent_private_memory_write() {
     .expect("start background task");
 
     let plan_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("plan llm request");
     assert!(plan_request.contains("Agent 私有记忆只能由本人写入"));
     let second_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("second llm request");
     assert!(second_request.contains("\\\"tool\\\": \\\"memory.write\\\""));
     assert!(second_request.contains("\\\"status\\\": \\\"blocked\\\""));
@@ -648,7 +648,7 @@ async fn background_agent_runtime_file_and_memory_writes_respect_project_policy(
     .expect("start background task");
 
     let _plan_request = receiver
-        .recv_timeout(Duration::from_secs(2))
+        .recv_timeout(MOCK_PROVIDER_REQUEST_TIMEOUT)
         .expect("plan llm request");
     assert!(receiver.recv_timeout(Duration::from_millis(200)).is_err());
 
diff --git a/docs/project-memory/shared-memory/pitfalls.md b/docs/project-memory/shared-memory/pitfalls.md
index d5d2bf7ef..cb554f6da 100644
--- a/docs/project-memory/shared-memory/pitfalls.md
+++ b/docs/project-memory/shared-memory/pitfalls.md
@@ -6213,6 +6213,23 @@ Cocos Creator 根目录由 `package.json.creator.version` 与普通 `assets/` 
 - **注意**：Claude Agent SDK 固定请求 `{ANTHROPIC_BASE_URL}/v1/messages?beta=true`（外加一次 `HEAD /api/hello` 探测），网关不要自己再补 `v1`，用通配段承接客户端协议路径。
 - **后台协议选项**：`AgcAgentMode` 增加 `anthropic`（显式 Anthropic 协议），`cc` 保留为同一执行器的历史别名；新增目录项应直接写 `anthropic`。
 
+## 2026-10-01 AGC 壳 Rust 单测片内 `--test-threads=1` 不等于没有并发：宿主后台回合会跨用例发通知
+
+- **现象**：`agent::thread_manager::tests::active_turn_changes_publish_one_notification_per_real_change` 在 CI 偶发红，`进度内容变化必须通知一次` 拿到 6 而非 5（也见过入队断言就多 1）；本地要跑 3–5 次才复现。这条用例靠一个进程级计数器数「运行中的项目」通知。
+- **原因**：`--test-threads=1` 只串行**测试线程**。上一个用例里 `TurnReservation::drop` → `kick_queue_dispatch` 会用 `tauri::async_runtime::spawn` 起整轮，这轮在 tokio 工作线程上继续跑（项目路径不存在 → 落盘失败 → `complete_turn_if_reserved` → `emit_direct_active_turns_changed`），恰好落在下一个用例的取样窗口里。用工作线程 ID + backtrace 才抓到现场。
+- **处理（现行口径）**：通知计数器改成线程作用域，只统计本测试线程发出的通知，断言语义（放行 1 / 内容变化 1 / 重复进度 0 / 收口 1）不变。「进程级全局量 + 片内串行 ⇒ 安全」这个假设在 AGC 壳单测里不成立，要么按线程隔离，要么别用全局量当断言依据。
+- **同时**：分片器的失败复核原先只认 `tests::` / `process_session::tests::` 前缀，而 bin 目标用例名是 `agent::…::tests::…`，于是 3143 条里 2218 条永远进不了复核，偶发假红直接判红；现在按本片名单精确匹配，并且复核也失败时保留首次现场。
+- **验证**：本机用 CI 那一片（`--shards=4 --shard-index=1` 的第 3 块）连跑：修复前 5 次红 3 次，修复后 18 次全绿；`node --test apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.test.mjs` 3 项通过。
+- **关联**：`apps/ai-game-creator-shell/src-tauri/src/agent/runtime_driver/entrypoints.rs`、`apps/ai-game-creator-shell/src-tauri/src/agent/thread_manager/dispatch.rs`、`apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.mjs`。
+
+## 2026-10-01 AGC 壳 Rust 单测里等 mock provider 请求的 2 秒预算，在 CI 分片并发下偏窄
+
+- **现象**：`tests::sessions::background_agent_runtime_can_write_memory_and_project_files` 在 CI `agc-rust-shard-4` 偶发红，`sessions.rs:405` 报 `second llm request: Timeout`——首个请求已经通过，只有第二次 provider 往返超时；失败复核同样红，整条用例 3.6 秒就结束。
+- **原因**：该断言只等了 `Duration::from_secs(2)`。一轮 mock 往返要等 Agent Runtime 后台线程跑到发请求那一步，CI 上 4 个 rust shard 与前端任务同机并发时单轮耗时会被拖到数秒；本机空载实测该请求 0.99–1.29 秒，同机负载下曾到 4.87 秒 / 5.18 秒。链路本身是好的，缺的是预算——这是分片并发放大出来的抖动，不是产品缺陷（同一次失败切回基线 commit 照样复现）。
+- **处理（现行口径）**：`src/tests/mod.rs` 新增 `MOCK_PROVIDER_REQUEST_TIMEOUT`（30 秒）作为「等一条 mock provider 请求到达」的唯一预算，`wait_for_captured_mock_request` 与 `sessions.rs` 里 7 处 `recv_timeout` 统一引用它；负向断言（确认「不会有下一个请求」的 200ms 窗口）保持不动。请求到达即返回，成功路径零成本，真断链仍会失败，只是失败得更晚。
+- **验证**：`cargo test --bin genarrative-ai-game-creator-shell tests::sessions:: -- --test-threads=1` 44 passed；`node apps/ai-game-creator-shell/scripts/run-rust-shell-test-shards.mjs --shards=4 --shard-index=4` 787 tests ok in 88.7s（正是原先失败的那一片）。
+- **关联**：`apps/ai-game-creator-shell/src-tauri/src/tests/sessions.rs`、`apps/ai-game-creator-shell/src-tauri/src/tests/mod.rs`。
+
 ## 2026-10-01 AGC 官方 Claude 模型缺少账号令牌会被误报为通道断开
 
 - **现象**：模型目录把回合路由到 `cc`，本地 `game-creator.config.json` 的 `llm.apiKey` 为空时，Claude Agent SDK 返回失败终态；界面只显示“执行通道未能建立或已断开”。