Harden privileged HTTP routes against cross-origin attacks: Added route-level middleware on /cli/* and /recording/* that blocks cross-origin browser requests via Sec-Fetch-Site header validation, rejects POST requests without Content-Type: application/json (prevents the CORS preflight bypass via text/plain), and enforces token authentication when token mode is enabled. Previously, CORS alone was relied upon, but CORS only blocks reading responses — it does not prevent "simple" POST requests from executing side effects like /cli/execute.
Token enforcement on HTTP routes: When --token is set (remote access mode), /cli/* and /recording/* routes now require Authorization: Bearer <token> or ?token=<token>, matching the behavior already documented in remote-access.md.
Security regression tests: Added tests covering Sec-Fetch-Site blocking, Content-Type enforcement, token validation on privileged routes, and pass-through for legitimate Node.js clients.
