feat: Add retry mechanism for blocked tasks

Blocked tasks (from spawn failures) were a dead-end with no way to
recover. Add retryBlockedTask to DispatchManager that resets status
to pending and re-queues, a tRPC mutation that also kicks dispatchNext,
and a Retry button in the task slide-over when status is blocked.

apps/server/dispatch/manager.ts

@@ -237,6 +237,27 @@ export class DefaultDispatchManager implements DispatchManager {
     this.eventBus.emit(event);
   }
 
+  /**
+   * Retry a blocked task.
+   * Resets status to pending, clears block state, and re-queues for dispatch.
+   */
+  async retryBlockedTask(taskId: string): Promise<void> {
+    const task = await this.taskRepository.findById(taskId);
+    if (!task) throw new Error(`Task not found: ${taskId}`);
+    if (task.status !== 'blocked') throw new Error(`Task ${taskId} is not blocked (status: ${task.status})`);
+
+    // Clear blocked state
+    this.blockedTasks.delete(taskId);
+
+    // Reset DB status to pending
+    await this.taskRepository.update(taskId, { status: 'pending' });
+
+    log.info({ taskId }, 'retrying blocked task');
+
+    // Re-queue for dispatch
+    await this.queue(taskId);
+  }
+
   /**
    * Dispatch next available task to an agent.
    */

apps/server/dispatch/phase-manager.test.ts

@@ -50,6 +50,7 @@ function createMockDispatchManager(): DispatchManager {
     dispatchNext: vi.fn().mockResolvedValue({ success: false, reason: 'mock' }),
     completeTask: vi.fn(),
     blockTask: vi.fn(),
+    retryBlockedTask: vi.fn(),
     getQueueState: vi.fn().mockResolvedValue({ queued: [], ready: [], blocked: [] }),
   };
 }

apps/server/dispatch/types.ts

@@ -102,6 +102,14 @@ export interface DispatchManager {
    */
   blockTask(taskId: string, reason: string): Promise<void>;
 
+  /**
+   * Retry a blocked task.
+   * Resets status to pending, removes from blocked map, and re-queues for dispatch.
+   *
+   * @param taskId - ID of the blocked task to retry
+   */
+  retryBlockedTask(taskId: string): Promise<void>;
+
   /**
    * Get current queue state.
    * Returns all queued tasks with their dispatch readiness.

apps/server/trpc/routers/dispatch.ts

@@ -35,5 +35,15 @@ export function dispatchProcedures(publicProcedure: ProcedureBuilder) {
         await dispatchManager.completeTask(input.taskId);
         return { success: true };
       }),
+
+    retryBlockedTask: publicProcedure
+      .input(z.object({ taskId: z.string().min(1) }))
+      .mutation(async ({ ctx, input }) => {
+        const dispatchManager = requireDispatchManager(ctx);
+        await dispatchManager.retryBlockedTask(input.taskId);
+        // Kick dispatch loop to pick up the re-queued task
+        await dispatchManager.dispatchNext();
+        return { success: true };
+      }),
   };
 }