🛡️ Sentinel: [HIGH] Add standard security headers #57
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- Adds `X-Content-Type-Options: nosniff` - Adds `X-Frame-Options: DENY` - Adds `Content-Security-Policy: default-src 'self'; frame-ancestors 'none'` - Adds `Strict-Transport-Security` (HSTS) with local development exclusions - Verifies headers with new test in `src/http-transport-security.test.ts` - Uses `supertest` for header verification in tests
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Implemented standard security headers (HSTS, CSP, X-Frame-Options, X-Content-Type-Options) in
src/http-transport.tsto harden the application against common web vulnerabilities. Added a new test case insrc/http-transport-security.test.tsto verify their presence. HSTS is conditionally applied to avoid locking out local development environments.PR created automatically by Jules for task 4989103498900635695 started by @davidruzicka