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.
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