chore: set printWidth to 120 and reformat

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/channels/registry.test.ts

@@ -1,10 +1,6 @@
 import { describe, it, expect } from 'vitest';
 
-import {
-  registerChannel,
-  getChannelFactory,
-  getRegisteredChannelNames,
-} from './registry.js';
+import { registerChannel, getChannelFactory, getRegisteredChannelNames } from './registry.js';
 
 // The registry is module-level state, so we need a fresh module per test.
 // We use dynamic import with cache-busting to isolate tests.