Added strict security headers to `firebase.json` for Firebase Hosting.
Headers included:
- X-Content-Type-Options: nosniff
- X-Frame-Options: DENY
- Referrer-Policy: strict-origin-when-cross-origin
- Content-Security-Policy: Includes directives for 'self', Google Fonts, EmailJS, and disallows object/frame embedding.
Also initialized `.jules/sentinel.md` with the first security learning.