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

src/cli/index.ts

@@ -0,0 +1,36 @@
+#!/usr/bin/env node
+import { Command } from 'commander';
+import { registerStartCommand } from './start.js';
+import { registerSendCommand } from './send.js';
+import { registerSessionsCommand } from './sessions.js';
+import { registerDoctorCommand } from './doctor.js';
+import { registerConfigCommand } from './config-cmd.js';
+import { registerTuiCommand } from './tui.js';
+
+export function createProgram(): Command {
+  const program = new Command();
+
+  program
+    .name('flynn')
+    .description('Flynn — self-hosted personal AI agent')
+    .version('0.1.0');
+
+  registerStartCommand(program);
+  registerTuiCommand(program);
+  registerSendCommand(program);
+  registerSessionsCommand(program);
+  registerDoctorCommand(program);
+  registerConfigCommand(program);
+
+  return program;
+}
+
+// Only run when executed directly (not imported in tests)
+const isDirectRun = process.argv[1] &&
+  (process.argv[1].endsWith('/cli/index.js') ||
+   process.argv[1].endsWith('/cli/index.ts'));
+
+if (isDirectRun) {
+  const program = createProgram();
+  program.parse(process.argv);
+}