fix(FN-954): allow retry for stuck-killed tasks across all interfaces

- Extend retry API to accept 'stuck-killed' as a retryable status alongside 'failed'
- Update CLI retry command to recognize stuck-killed tasks
- Update pi extension retry tool to handle stuck-killed tasks
- Show retry button in TaskDetailModal for stuck-killed task status
- Add changeset for patch release

packages/dashboard/app/components/TaskDetailModal.tsx

@@ -1243,7 +1243,7 @@ export function TaskDetailModal({
               Refine
             </button>
           )}
-          {task.status === "failed" && onRetryTask && (
+          {(task.status === "failed" || task.status === "stuck-killed") && onRetryTask && (
             <button className="btn btn-warning btn-sm" onClick={handleRetry}>
               Retry
             </button>

packages/dashboard/src/routes.test.ts

@@ -704,7 +704,7 @@ describe("POST /tasks/:id/retry", () => {
     expect(store.moveTask).toHaveBeenCalledWith("KB-001", "todo");
   });
 
-  it("returns 400 when task is not in failed state", async () => {
+  it("returns 400 when task is not in a retryable state", async () => {
     const activeTask = { ...FAKE_TASK_DETAIL, status: "executing" };
     (store.getTask as ReturnType<typeof vi.fn>).mockResolvedValue(activeTask);
 
@@ -713,7 +713,7 @@ describe("POST /tasks/:id/retry", () => {
     });
 
     expect(res.status).toBe(400);
-    expect(res.body.error).toContain("not in a failed state");
+    expect(res.body.error).toContain("not in a retryable state");
   });
 
   it("retries a failed task in any column (not just in-progress)", async () => {
@@ -731,6 +731,23 @@ describe("POST /tasks/:id/retry", () => {
     expect(store.updateTask).toHaveBeenCalledWith("KB-001", { status: undefined, error: undefined });
     expect(store.moveTask).toHaveBeenCalledWith("KB-001", "todo");
   });
+
+  it("retries a stuck-killed task and moves it to todo", async () => {
+    const stuckTask = { ...FAKE_TASK_DETAIL, status: "stuck-killed", column: "in-progress" };
+    const movedTask = { ...FAKE_TASK_DETAIL, column: "todo", status: undefined };
+    (store.getTask as ReturnType<typeof vi.fn>).mockResolvedValue(stuckTask);
+    (store.updateTask as ReturnType<typeof vi.fn>).mockResolvedValue(stuckTask);
+    (store.moveTask as ReturnType<typeof vi.fn>).mockResolvedValue(movedTask);
+
+    const res = await REQUEST(buildApp(), "POST", "/api/tasks/KB-001/retry", JSON.stringify({}), {
+      "Content-Type": "application/json",
+    });
+
+    expect(res.status).toBe(200);
+    expect(store.updateTask).toHaveBeenCalledWith("KB-001", { status: undefined, error: undefined });
+    expect(store.moveTask).toHaveBeenCalledWith("KB-001", "todo");
+    expect(store.logEntry).toHaveBeenCalledWith("KB-001", "Retry requested from dashboard");
+  });
 });
 
 describe("POST /tasks/:id/duplicate", () => {

packages/dashboard/src/routes.ts

@@ -1784,13 +1784,13 @@ export function createApiRoutes(store: TaskStore, options?: ServerOptions): Rout
     }
   });
 
-  // Retry failed task
+  // Retry failed or stuck-killed task
   router.post("/tasks/:id/retry", async (req, res) => {
     try {
       const scopedStore = await getScopedStore(req);
       const task = await scopedStore.getTask(req.params.id);
-      if (task.status !== "failed") {
-        res.status(400).json({ error: "Task is not in a failed state" });
+      if (task.status !== "failed" && task.status !== "stuck-killed") {
+        res.status(400).json({ error: `Task is not in a retryable state (current status: ${task.status || 'none'})` });
         return;
       }
       await scopedStore.updateTask(req.params.id, { status: undefined, error: undefined });