Suppress Node DEP0040 punycode warning in CLI startup

src/cli/index.ts

@@ -4,6 +4,7 @@
 // Silent no-op if the file doesn't exist.
 try { process.loadEnvFile(); } catch { /* .env not found — that's fine */ }
 
+import './suppressNodeWarnings.js';
 import { Command } from 'commander';
 import { registerStartCommand } from './start.js';
 import { registerSendCommand } from './send.js';