feat(cli): implement CLI entry point with auto-daemon launcher (Task 18)

- Add auto-daemon.ts: ensureDaemonRunning() checks health, reads pidfile,
  spawns daemon if needed, polls health up to 3s
- Rewrite index.ts: commander-based CLI with all subcommands (health,
  open, list, get, kill, navigate, click, type, scroll, eval, wait,
  screenshot, text, html, profiles)
- Add daemon project reference to cli tsconfig

packages/cli/src/auto-daemon.ts

@@ -0,0 +1,39 @@
+import { spawn } from 'node:child_process';
+import path from 'node:path';
+import { readPidfile, isProcessAlive } from '@visionl/daemon/dist/pidfile.js';
+import { VisionLClient } from '@visionl/core';
+
+const POLL_INTERVAL_MS = 100;
+const MAX_WAIT_MS = 3000;
+
+export async function ensureDaemonRunning(port: number): Promise<VisionLClient> {
+  const client = new VisionLClient(`http://127.0.0.1:${port}`);
+
+  if (await client.health()) {
+    return client;
+  }
+
+  const pidInfo = readPidfile();
+  if (pidInfo && isProcessAlive(pidInfo.pid)) {
+    if (await client.health()) {
+      return client;
+    }
+  }
+
+  const daemonEntryPath = path.resolve(__dirname, '../../daemon/dist/server.js');
+  spawn('node', [daemonEntryPath], {
+    env: { ...process.env, VISIONL_PORT: String(port) },
+    stdio: 'ignore',
+    detached: true,
+  }).unref();
+
+  const startTime = Date.now();
+  while (Date.now() - startTime < MAX_WAIT_MS) {
+    await new Promise((resolve) => setTimeout(resolve, POLL_INTERVAL_MS));
+    if (await client.health()) {
+      return client;
+    }
+  }
+
+  throw new Error('DAEMON_UNREACHABLE');
+}