fix(tasks): refresh open windows when a task is archived headlessly

The renderer only updated its task store optimistically inside its own
archive flow, so archives initiated from the main process (e.g. the
automations runtime) left a stale sidebar until a hard reload.
taskService.archiveTask now emits a task:archived event and the task
manager store mirrors the archive mutation on receipt, guarded
idempotent so renderer-initiated archives are not double-processed.

Author: dfox288

apps/emdash-desktop/src/main/core/tasks/task-service.test.ts

@@ -0,0 +1,69 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { events } from '@main/lib/events';
+import { taskArchivedChannel } from '@shared/core/tasks/taskEvents';
+import { archiveTask as archiveTaskOp } from './operations/archiveTask';
+
+// task-service pulls in the full main-process graph at import time; mock the
+// heavy singletons / db so the module loads in a plain node test, and stub
+// every task operation so we can drive the service in isolation.
+vi.mock('@main/lib/events', () => ({
+  events: { emit: vi.fn(), on: vi.fn(() => vi.fn()) },
+}));
+vi.mock('@main/lib/logger', () => ({ log: { error: vi.fn(), warn: vi.fn(), info: vi.fn() } }));
+vi.mock('@main/db/client', () => ({ db: {} }));
+vi.mock('@main/db/schema', () => ({ tasks: {}, workspaces: {} }));
+vi.mock('@main/core/projects/project-manager', () => ({ projectManager: {} }));
+vi.mock('@main/core/workspaces/workspace-bootstrap-service', () => ({
+  workspaceBootstrapService: {},
+}));
+vi.mock('@main/core/workspaces/workspace-registry', () => ({ workspaceRegistry: {} }));
+vi.mock('./task-session-manager', () => ({ taskSessionManager: {} }));
+vi.mock('./utils/utils', () => ({ mapTaskRowToTask: vi.fn() }));
+vi.mock('./operations/archiveTask', () => ({ archiveTask: vi.fn(async () => undefined) }));
+vi.mock('./operations/createTask', () => ({ createTask: vi.fn() }));
+vi.mock('./operations/deleteTask', () => ({ deleteTask: vi.fn() }));
+vi.mock('./operations/getDeletePreflight', () => ({ getDeletePreflight: vi.fn() }));
+vi.mock('./operations/getTasks', () => ({ getTasks: vi.fn() }));
+vi.mock('./operations/renameTask', () => ({ renameTask: vi.fn() }));
+vi.mock('./operations/restoreTask', () => ({ restoreTask: vi.fn() }));
+vi.mock('./operations/setTaskPinned', () => ({ setTaskPinned: vi.fn() }));
+vi.mock('./operations/updateLinkedIssue', () => ({ updateLinkedIssue: vi.fn() }));
+vi.mock('./operations/updateTaskStatus', () => ({ updateTaskStatus: vi.fn() }));
+
+const { TaskService } = await import('./task-service');
+
+const mockEmit = vi.mocked(events.emit);
+const mockArchiveOp = vi.mocked(archiveTaskOp);
+
+describe('TaskService.archiveTask', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('archives via the operation and notifies open windows', async () => {
+    const service = new TaskService();
+    await service.archiveTask('project-1', 'task-1');
+
+    expect(mockArchiveOp).toHaveBeenCalledWith('project-1', 'task-1');
+    expect(mockEmit).toHaveBeenCalledWith(taskArchivedChannel, {
+      taskId: 'task-1',
+      projectId: 'project-1',
+    });
+  });
+
+  it('emits the archived event only after the archive operation completes', async () => {
+    const order: string[] = [];
+    mockArchiveOp.mockImplementationOnce(async () => {
+      order.push('archive-op');
+    });
+    mockEmit.mockImplementationOnce(() => {
+      order.push('emit');
+      return undefined as never;
+    });
+
+    const service = new TaskService();
+    await service.archiveTask('project-1', 'task-1');
+
+    expect(order).toEqual(['archive-op', 'emit']);
+  });
+});

apps/emdash-desktop/src/main/core/tasks/task-service.ts

@@ -11,7 +11,11 @@ import { events } from '@main/lib/events';
 import { HookCore, type Hookable } from '@main/lib/hookable';
 import { log } from '@main/lib/logger';
 import type { LinkedIssue } from '@shared/core/linked-issue';
-import { taskCreatedChannel, taskProvisionedChannel } from '@shared/core/tasks/taskEvents';
+import {
+  taskArchivedChannel,
+  taskCreatedChannel,
+  taskProvisionedChannel,
+} from '@shared/core/tasks/taskEvents';
 import type {
   CreateTaskError,
   CreateTaskParams,
@@ -182,6 +186,10 @@ export class TaskService implements Hookable<TaskLifecycleHooks> {
   async archiveTask(projectId: string, taskId: string): Promise<void> {
     await archiveTask(projectId, taskId);
     this._hooks.callHookBackground('task:archived', taskId, projectId);
+    // Notify open windows — headless initiators (automations, inbound MCP)
+    // have no renderer-side optimistic update. The renderer handler is
+    // idempotent for GUI-initiated archives.
+    events.emit(taskArchivedChannel, { taskId, projectId });
   }
 
   async restoreTask(id: string): Promise<void> {

apps/emdash-desktop/src/renderer/features/tasks/stores/task-manager.ts

@@ -15,6 +15,7 @@ import { gitWorkspaceChangedChannel } from '@shared/core/git/gitEvents';
 import { prSyncProgressChannel, prUpdatedChannel } from '@shared/core/pull-requests/prEvents';
 import {
   lifecycleScriptStatusChannel,
+  taskArchivedChannel,
   taskCreatedChannel,
   taskProvisionProgressChannel,
   taskProvisionedChannel,
@@ -109,6 +110,7 @@ export class TaskManagerStore {
   private _provisionPromises = new Map<string, Promise<void>>();
 
   private _unsubTaskCreated: (() => void) | null = null;
+  private _unsubTaskArchived: (() => void) | null = null;
   private _unsubPrUpdated: (() => void) | null = null;
   private _unsubPrSyncProgress: (() => void) | null = null;
   private _unsubGitWorkspaceChanged: (() => void) | null = null;
@@ -144,6 +146,28 @@ export class TaskManagerStore {
       });
     });
 
+    this._unsubTaskArchived = events.on(
+      taskArchivedChannel,
+      ({ taskId, projectId: evtProjectId }) => {
+        if (evtProjectId !== this.projectId) return;
+        const task = this.tasks.get(taskId);
+        // Idempotent: GUI-initiated archives already updated the store
+        // optimistically (archivedAt set) before this event arrives. Only
+        // headless archives (automations, inbound MCP) take this path.
+        if (!task || !isRegistered(task) || task.data.archivedAt) return;
+        runInAction(() => {
+          task.data.archivedAt = new Date().toISOString();
+        });
+        this._releaseTaskRegistries(taskId);
+        runInAction(() => {
+          const current = this.tasks.get(taskId);
+          if (current && isRegistered(current)) {
+            current.transitionToDryUnprovisioned({ ...current.data }, 'idle');
+          }
+        });
+      }
+    );
+
     this._unsubStatusUpdated = events.on(
       taskStatusUpdatedChannel,
       ({ taskId, projectId: evtProjectId, status }) => {
@@ -656,6 +680,8 @@ export class TaskManagerStore {
   dispose(): void {
     this._unsubTaskCreated?.();
     this._unsubTaskCreated = null;
+    this._unsubTaskArchived?.();
+    this._unsubTaskArchived = null;
     this._unsubPrUpdated?.();
     this._unsubPrUpdated = null;
     this._unsubPrSyncProgress?.();

apps/emdash-desktop/src/shared/core/tasks/taskEvents.ts

@@ -4,6 +4,17 @@ import { defineEvent } from '@shared/lib/ipc/events';
 
 export const taskCreatedChannel = defineEvent<{ task: Task }>('task:created');
 
+/**
+ * Emitted by the main process whenever a task is archived — regardless of
+ * initiator (renderer, automations, inbound MCP server). The renderer's
+ * own archive flow updates its store optimistically, so its handler for
+ * this event must be (and is) idempotent; the event exists so headless
+ * archives reach open windows too.
+ */
+export const taskArchivedChannel = defineEvent<{ taskId: string; projectId: string }>(
+  'task:archived'
+);
+
 export const taskStatusUpdatedChannel = defineEvent<{
   taskId: string;
   projectId: string;