fix: remaining -v2 references in scripts, add v1 channels barrel

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

scripts/test-v2-host.ts

@@ -69,7 +69,7 @@ console.log('✓ Central DB initialized');
 // --- Step 2: Route inbound message (spawns container) ---
 console.log('\n=== Step 2: Route inbound message ===');
 
-import { routeInbound } from '../src/router-v2.js';
+import { routeInbound } from '../src/router.js';
 import { findSession } from '../src/db/sessions.js';
 import { sessionDbPath } from '../src/session-manager.js';