feat(06-03): add merge and coordinate CLI commands

- Add cw merge queue <taskId> to queue tasks for merge
- Add cw merge status to show merge queue status
- Add cw merge next to show next task ready to merge
- Add cw coordinate [--target <branch>] to process all ready merges

src/cli/index.ts

@@ -524,6 +524,109 @@ export function createCli(serverHandler?: (port?: number) => Promise<void>): Com
       }
     });
 
+  // Merge command group
+  const mergeCommand = program
+    .command('merge')
+    .description('Manage merge queue');
+
+  // cw merge queue <taskId>
+  mergeCommand
+    .command('queue <taskId>')
+    .description('Queue a completed task for merge')
+    .action(async (taskId: string) => {
+      try {
+        const client = createDefaultTrpcClient();
+        await client.queueMerge.mutate({ taskId });
+        console.log(`Task '${taskId}' queued for merge`);
+      } catch (error) {
+        console.error('Failed to queue for merge:', (error as Error).message);
+        process.exit(1);
+      }
+    });
+
+  // cw merge status
+  mergeCommand
+    .command('status')
+    .description('Show merge queue status')
+    .action(async () => {
+      try {
+        const client = createDefaultTrpcClient();
+        const state = await client.getMergeQueueStatus.query();
+
+        console.log('Merge Queue Status');
+        console.log('==================');
+        console.log(`Queued: ${state.queued.length}`);
+        console.log(`In Progress: ${state.inProgress.length}`);
+        console.log(`Merged: ${state.merged.length}`);
+        console.log(`Conflicted: ${state.conflicted.length}`);
+
+        if (state.conflicted.length > 0) {
+          console.log('');
+          console.log('Conflicts:');
+          for (const c of state.conflicted) {
+            console.log(`  ${c.taskId}: ${c.conflicts.join(', ')}`);
+          }
+        }
+      } catch (error) {
+        console.error('Failed to get merge queue status:', (error as Error).message);
+        process.exit(1);
+      }
+    });
+
+  // cw merge next
+  mergeCommand
+    .command('next')
+    .description('Show next task ready to merge')
+    .action(async () => {
+      try {
+        const client = createDefaultTrpcClient();
+        const next = await client.getNextMergeable.query();
+        if (next) {
+          console.log(`Next mergeable: ${next.taskId} (priority: ${next.priority})`);
+        } else {
+          console.log('No tasks ready to merge');
+        }
+      } catch (error) {
+        console.error('Failed to get next mergeable:', (error as Error).message);
+        process.exit(1);
+      }
+    });
+
+  // Coordinate command - process all ready merges
+  program
+    .command('coordinate')
+    .description('Process all ready merges in dependency order')
+    .option('-t, --target <branch>', 'Target branch for merges', 'main')
+    .action(async (options: { target: string }) => {
+      try {
+        const client = createDefaultTrpcClient();
+        console.log(`Processing merges to ${options.target}...`);
+
+        const { results } = await client.processMerges.mutate({
+          targetBranch: options.target,
+        });
+
+        const succeeded = results.filter(r => r.success).length;
+        const conflicted = results.filter(r => !r.success).length;
+
+        console.log('');
+        console.log('Results:');
+        console.log(`  Merged: ${succeeded}`);
+        console.log(`  Conflicts: ${conflicted}`);
+
+        if (conflicted > 0) {
+          console.log('');
+          console.log('Conflicted tasks (bounce-back tasks created):');
+          for (const r of results.filter(r => !r.success)) {
+            console.log(`  ${r.taskId}: ${r.conflicts?.join(', ')}`);
+          }
+        }
+      } catch (error) {
+        console.error('Failed to process merges:', (error as Error).message);
+        process.exit(1);
+      }
+    });
+
   return program;
 }