feat(cli): add CLI entry point with commander and start command

src/cli/start.ts

@@ -0,0 +1,39 @@
+import type { Command } from 'commander';
+import { loadConfigSafe, getConfigPath } from './shared.js';
+import { existsSync } from 'fs';
+
+export function registerStartCommand(program: Command): void {
+  program
+    .command('start')
+    .description('Start the Flynn daemon')
+    .option('-c, --config <path>', 'Config file path')
+    .action(async (opts: { config?: string }) => {
+      const configPath = opts.config ?? getConfigPath();
+
+      if (!existsSync(configPath)) {
+        console.error(`Config file not found: ${configPath}`);
+        console.error('Run "flynn doctor" to diagnose, or create a config at ~/.config/flynn/config.yaml');
+        process.exit(1);
+      }
+
+      console.log('Flynn starting...');
+      console.log(`Loading config from: ${configPath}`);
+
+      const { config, error } = loadConfigSafe(configPath);
+      if (!config) {
+        console.error(error);
+        process.exit(1);
+      }
+
+      // Dynamic import to avoid loading daemon code for other commands
+      const { startDaemon } = await import('../daemon/index.js');
+      const daemon = await startDaemon(config);
+
+      console.log(`Allowed Telegram chat IDs: ${config.telegram.allowed_chat_ids.join(', ')}`);
+
+      // Keep process alive
+      await new Promise<void>((resolve) => {
+        daemon.lifecycle.onShutdown(async () => resolve());
+      });
+    });
+}