feat(05-02): add task CLI commands

- Add `cw task list --plan <planId>` command
  - Display tasks as table: name, status, type, priority
  - Show count of pending/in_progress/completed/blocked
- Add `cw task get <taskId>` command
  - Display full task details: id, name, description, type, priority, status, order, timestamps
- Add `cw task status <taskId> <status>` command
  - Validate status is one of: pending, in_progress, completed, blocked
  - Confirm status update

src/cli/index.ts

@@ -231,11 +231,93 @@ export function createCli(serverHandler?: (port?: number) => Promise<void>): Com
       }
     });
 
-  program
+  // Task command group
+  const taskCommand = program
     .command('task')
-    .description('Manage tasks')
+    .description('Manage tasks');
-    .action(() => {
+
-      console.log('cw task: not implemented');
+  // cw task list --plan <planId>
+  taskCommand
+    .command('list')
+    .description('List tasks for a plan')
+    .requiredOption('--plan <planId>', 'Plan ID to list tasks for')
+    .action(async (options: { plan: string }) => {
+      try {
+        const client = createDefaultTrpcClient();
+        const tasks = await client.listTasks.query({ planId: options.plan });
+        if (tasks.length === 0) {
+          console.log('No tasks found for this plan');
+          return;
+        }
+
+        // Count by status
+        const pending = tasks.filter(t => t.status === 'pending' || t.status === 'pending_approval').length;
+        const inProgress = tasks.filter(t => t.status === 'in_progress').length;
+        const completed = tasks.filter(t => t.status === 'completed').length;
+        const blocked = tasks.filter(t => t.status === 'blocked').length;
+
+        console.log('Tasks:');
+        console.log('');
+        for (const task of tasks) {
+          const statusLabel = task.status === 'in_progress' ? 'IN_PROGRESS' : task.status.toUpperCase();
+          const priorityLabel = task.priority === 'high' ? '[HIGH]' : task.priority === 'low' ? '[low]' : '';
+          console.log(`  ${task.order}. ${task.name} [${statusLabel}] ${task.type} ${priorityLabel}`);
+        }
+        console.log('');
+        console.log(`Summary: ${pending} pending, ${inProgress} in progress, ${completed} completed, ${blocked} blocked`);
+      } catch (error) {
+        console.error('Failed to list tasks:', (error as Error).message);
+        process.exit(1);
+      }
+    });
+
+  // cw task get <taskId>
+  taskCommand
+    .command('get <taskId>')
+    .description('Get task details by ID')
+    .action(async (taskId: string) => {
+      try {
+        const client = createDefaultTrpcClient();
+        const task = await client.getTask.query({ id: taskId });
+        console.log(`Task: ${task.name}`);
+        console.log(`  ID: ${task.id}`);
+        console.log(`  Plan: ${task.planId}`);
+        console.log(`  Description: ${task.description ?? '(none)'}`);
+        console.log(`  Type: ${task.type}`);
+        console.log(`  Priority: ${task.priority}`);
+        console.log(`  Status: ${task.status}`);
+        console.log(`  Order: ${task.order}`);
+        console.log(`  Created: ${task.createdAt}`);
+        console.log(`  Updated: ${task.updatedAt}`);
+      } catch (error) {
+        console.error('Failed to get task:', (error as Error).message);
+        process.exit(1);
+      }
+    });
+
+  // cw task status <taskId> <status>
+  taskCommand
+    .command('status <taskId> <status>')
+    .description('Update task status (pending, in_progress, completed, blocked)')
+    .action(async (taskId: string, status: string) => {
+      const validStatuses = ['pending', 'in_progress', 'completed', 'blocked'];
+      if (!validStatuses.includes(status)) {
+        console.error(`Invalid status: ${status}`);
+        console.error(`Valid statuses: ${validStatuses.join(', ')}`);
+        process.exit(1);
+      }
+
+      try {
+        const client = createDefaultTrpcClient();
+        const task = await client.updateTaskStatus.mutate({
+          id: taskId,
+          status: status as 'pending' | 'in_progress' | 'completed' | 'blocked',
+        });
+        console.log(`Task '${task.name}' status updated to: ${task.status}`);
+      } catch (error) {
+        console.error('Failed to update task status:', (error as Error).message);
+        process.exit(1);
+      }
     });
 
   return program;