feat: side-thread task kind (Muse role alignment phase 2)

Tasks gain kind='main'|'side' (NULL=main). A side thread hangs under a
parent task, defaults to the local executor, never builds a worktree,
branch or container unless explicitly asked, and writes its conclusion
back to the parent via task_followups on terminal transition.

- server: kind validation + side-thread gates (parent required, no
  coordinator_parts/upload_id/environment_id, parent must not be a
  coordinator), local executor default, GET /tasks kind filter,
  /worktree 404 and /fork /merge /pr 409 for side threads.
- worker: side-default shunt in _run_attempt (no-worktree scratch cwd,
  in-memory plan=1 when a repo is present, seed/checkpoint skipped),
  _writeback_side_thread, marker task-create kind field + inheritance,
  side threads excluded from marker spawn counts.
- host/sandbox: --no-worktree plumbing for dispatch/goal/popen
  (Local + Docker), scratch cwd work/side-threads/<task-id>.
- console (classic only): kind filter + [旁聊] rows + '开旁聊' entry,
  side-thread dispatch mode, side-thread list in detail, merge/PR/fork
  hidden for side threads; build exit 0, console.html sha df39db5a.
- tests: new test_sidethread.py (29 tests) + kind backfill tests in
  test_p2_migrations.py; full cloud suite 3900 tests OK (skipped=13).

Design: verification/codex-muse-role-alignment-design-20261108.md
Summary: verification/codex-muse-role-align-p1p2-20261108.md
Local only: not pushed, not merged, not deployed.

cloud/console-react/src/hooks/useConsoleStore.ts

@@ -23,6 +23,10 @@ export function useConsoleStore(): ConsoleCtx {
   const onTasksReload = useCallback(() => { void taskList.refreshTasks(undefined, projectIdRef.current); }, [taskList]);
   const detail = useTaskDetail(getRole, onTasksReload);
   const [refreshStamp, setRefreshStamp] = useState("--:--:--");
+  // 旁聊（Muse 角色对齐 P2）：派发器的旁聊父任务。列表“开旁聊”
+  // 点选主聊后填这里，派发器读到即进旁聊模式；提交成功或点
+  // “取消旁聊模式”后清空。放胶水层，不进 App.tsx。
+  const [sideParentId, setSideParentId] = useState<string | null>(null);
 
   const selectProject = useCallback((id: string) => {
     catalog.setProjectId(id);
@@ -126,6 +130,7 @@ export function useConsoleStore(): ConsoleCtx {
     refreshTasks: () => void taskList.refreshTasks(undefined, projectIdRef.current),
     statusFilter: taskList.statusFilter, setStatusFilter: taskList.setStatusFilter,
     executorFilter: taskList.executorFilter, setExecutorFilter: taskList.setExecutorFilter,
+    kindFilter: taskList.kindFilter, setKindFilter: taskList.setKindFilter,
     searchText: taskList.searchText, setSearchText: taskList.setSearchText,
     filteredTasks: taskList.filteredTasks,
     taskPage: taskList.page, taskTotalPages: taskList.totalPages, taskTotal: taskList.taskTotal,
@@ -135,6 +140,7 @@ export function useConsoleStore(): ConsoleCtx {
     doAction: detail.doAction, taskCost: detail.taskCost, costBox: detail.costBox, costSummary: detail.costSummary,
     forkVisible: detail.forkVisible, setForkVisible: detail.setForkVisible, forkTask: detail.forkTask, forkMsg: detail.forkMsg,
     coordChildren: detail.coordChildren, coordText: "", agents: detail.agents, agentsNote: detail.agentsNote,
+    sideThreads: detail.sideThreads, sideParentId, setSideParentId,
     reviews: detail.reviews, reviewMsg: detail.reviewMsg, reviewError: detail.reviewError,
     refreshReviews: detail.refreshReviews, postReview: detail.postReview, submitFindings: detail.submitFindings,
     traceEntries: detail.traceEntries, traceNote: detail.traceNote, traceDone: detail.traceDone,

cloud/console-react/src/hooks/useTaskDetail.ts

@@ -19,6 +19,9 @@ export function useTaskDetail(getRole: (pid?: string) => string | null, onTasksR
   const [forkVisible, setForkVisible] = useState(false);
   const [forkMsg, setForkMsg] = useState("");
   const [coordChildren, setCoordChildren] = useState<Task[]>([]);
+  // 旁聊（Muse 角色对齐 P2）：当前任务挂着的旁聊线程（kind=side
+  // 且 parent_task_id=本任务），与协调员子任务同款拉取方式。
+  const [sideThreads, setSideThreads] = useState<Task[]>([]);
   const [agents, setAgents] = useState<Agent[]>([]);
   const [agentsNote, setAgentsNote] = useState("");
   const [reviews, setReviews] = useState<Review[]>([]);
@@ -71,6 +74,13 @@ export function useTaskDetail(getRole: (pid?: string) => string | null, onTasksR
     } catch { setCoordChildren([]); }
   }, []);
 
+  const loadSideThreads = useCallback(async (task: Task) => {
+    try {
+      const d = await api<{ tasks: Task[] }>(paths.tasksByParent(task.project_id || "", task.id, "side"));
+      setSideThreads(d.tasks || []);
+    } catch { setSideThreads([]); }
+  }, []);
+
   const loadCost = useCallback(async (taskId: string) => {
     try {
       const c = await api<TaskCost>(paths.taskCost(taskId));
@@ -248,6 +258,7 @@ export function useTaskDetail(getRole: (pid?: string) => string | null, onTasksR
       void startTrace(taskId, t.status);
       void loadAgents(taskId);
       void loadCoordChildren(t);
+      void loadSideThreads(t);
       void loadChatHistory(taskId);
       void loadFollowups(taskId);
       void loadPeerMessages(taskId);
@@ -259,7 +270,7 @@ export function useTaskDetail(getRole: (pid?: string) => string | null, onTasksR
       setCurrentTask(null);
       setDetailBody("加载失败：" + e.message);
     }
-  }, [stopTrace, startTrace, loadAgents, loadCoordChildren, loadChatHistory, loadFollowups, loadPeerMessages, loadThread, loadThreads, loadReviews, loadApprovals, loadCost, getRole]);
+  }, [stopTrace, startTrace, loadAgents, loadCoordChildren, loadSideThreads, loadChatHistory, loadFollowups, loadPeerMessages, loadThread, loadThreads, loadReviews, loadApprovals, loadCost, getRole]);
 
   const refreshDetailLists = useCallback(async () => {
     const t = currentTaskRef.current;
@@ -277,12 +288,13 @@ export function useTaskDetail(getRole: (pid?: string) => string | null, onTasksR
     void loadReviews(t.id);
     void loadApprovals(t.id);
     void loadCoordChildren(t);
+    void loadSideThreads(t);
     void loadAgents(t.id);
     void loadPeerMessages(t.id);
     void loadThread(t.id);
     void loadThreads(t.id);
     void loadCost(t.id);
-  }, [loadFollowups, loadChatHistory, loadReviews, loadApprovals, loadCoordChildren, loadAgents, loadPeerMessages, loadThread, loadThreads, loadCost]);
+  }, [loadFollowups, loadChatHistory, loadReviews, loadApprovals, loadCoordChildren, loadSideThreads, loadAgents, loadPeerMessages, loadThread, loadThreads, loadCost]);
 
   const doAction = useCallback(async (kind: string) => {
     const t = currentTaskRef.current;
@@ -423,7 +435,7 @@ export function useTaskDetail(getRole: (pid?: string) => string | null, onTasksR
 
   return {
     currentTask, detailBody, actionMsg, actionReasons, costBox, costSummary, forkVisible, setForkVisible, forkMsg,
-    coordChildren, agents, agentsNote, reviews, reviewMsg, reviewError, traceEntries, traceNote, traceDone,
+    coordChildren, sideThreads, agents, agentsNote, reviews, reviewMsg, reviewError, traceEntries, traceNote, traceDone,
     traceKind, setTraceKind, traceMsg, followups, approvals, approvalMsg, peerMessages, peerMsg,
     threadText, threadGateNote, threadMsg, threadList, chatMsg, chatHistory,
     showDetail, refreshDetailLists, doAction, taskCost, forkTask, postReview, submitFindings,

cloud/console-react/src/hooks/useTaskList.ts

@@ -21,13 +21,14 @@ export function useTaskList() {
   const [taskError, setTaskError] = useState("");
   const [statusFilter, setStatusFilter] = useState("");
   const [executorFilter, setExecutorFilter] = useState("");
+  const [kindFilter, setKindFilter] = useState("");
   const [searchText, setSearchText] = useState("");
   const [page, setPageState] = useState(0);
   const [taskTotal, setTaskTotal] = useState(0);
   const [taskStatusCounts, setTaskStatusCounts] = useState<Record<string, number>>({});
   const pageRef = useRef(0);
-  const filterRef = useRef({ status: "", executor: "", q: "" });
-  filterRef.current = { status: statusFilter, executor: executorFilter, q: searchText };
+  const filterRef = useRef({ status: "", executor: "", q: "", kind: "" });
+  filterRef.current = { status: statusFilter, executor: executorFilter, q: searchText, kind: kindFilter };
   const lastProjectRef = useRef("");
 
   const refreshTasks = useCallback(async (pid?: string, currentPid?: string, pageOverride?: number) => {
@@ -38,7 +39,7 @@ export function useTaskList() {
     const f = filterRef.current;
     try {
       const d = await api<{ tasks: Task[]; total?: number; status_counts?: Record<string, number> }>(
-        paths.tasksPage(id, TASK_PAGE_SIZE, p * TASK_PAGE_SIZE, f.status, f.executor, f.q));
+        paths.tasksPage(id, TASK_PAGE_SIZE, p * TASK_PAGE_SIZE, f.status, f.executor, f.q, f.kind));
       setTasks(d.tasks || []);
       setTaskTotal(d.total ?? (d.tasks || []).length);
       setTaskStatusCounts(d.status_counts || {});
@@ -66,13 +67,14 @@ export function useTaskList() {
     const t = setTimeout(() => { void refreshTasks(lastProjectRef.current, undefined, 0); }, 300);
     return () => clearTimeout(t);
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [statusFilter, executorFilter, searchText]);
+  }, [statusFilter, executorFilter, searchText, kindFilter]);
 
   // Filter/project changes reset to page 1: the old page may not
   // exist under the new filter, and staying on it would show an
   // empty page with a misleading "共 N 个" count.
   const setStatusFilterPage = useCallback((v: string) => { setStatusFilter(v); setPage(0); }, [setPage]);
   const setExecutorFilterPage = useCallback((v: string) => { setExecutorFilter(v); setPage(0); }, [setPage]);
+  const setKindFilterPage = useCallback((v: string) => { setKindFilter(v); setPage(0); }, [setPage]);
   const setSearchTextPage = useCallback((v: string) => { setSearchText(v); setPage(0); }, [setPage]);
   const refreshTasksFirstPage = useCallback(async (pid?: string) => {
     setPage(0);
@@ -99,6 +101,7 @@ export function useTaskList() {
   return {
     tasks, taskError, statusFilter, setStatusFilter: setStatusFilterPage,
     executorFilter, setExecutorFilter: setExecutorFilterPage,
+    kindFilter, setKindFilter: setKindFilterPage,
     searchText, setSearchText: setSearchTextPage,
     filteredTasks, taskCountText, refreshTasks, refreshTasksFirstPage,
     page, totalPages, taskTotal, taskStatusCounts, goToPage, dispatch,