feat(security): implement Content Security Policy - #82
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- Add kit.csp to svelte.config.js with mode: 'hash': default-src/connect-src/img-src 'self'; script-src with hashes; style-src 'self'; font-src/object-src 'none'; base-uri/form-action 'self'; frame-ancestors 'none'; upgrade-insecure-requests - CSP delivered as HTTP header (Cloudflare Worker SSR) so frame-ancestors is enforced; X-Frame-Options remains as legacy fallback - Replace style="display: contents" in app.html with Tailwind contents class to eliminate the one inline style attribute - Manually hash the theme-detection inline script in app.html; SvelteKit auto-hashes its bootstrap script per render - Document method restriction (405 on non-GET), CSP reporting gap, and coordinated disclosure policy in SECURITY.md - Restructure SECURITY.md: new Runtime protections section between How the application works and Supply chain controls
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Summary
kit.csp—mode: 'hash', delivered as an HTTP response header (not meta tag, soframe-ancestorsis enforced by the Cloudflare Worker SSR path)default-src 'self';script-src 'self' <hashes>(nounsafe-inline);style-src 'self';connect/img-src 'self';font/object-src 'none';base-uri/form-action 'self';frame-ancestors 'none';upgrade-insecure-requestsapp.htmlmanually hashed; SvelteKit auto-hashes its bootstrap script per renderstyle="display: contents"→class="contents"(Tailwind utility) to eliminate the one inline style attribute that would have requiredunsafe-hashesTest plan
content-security-policy, confirm SAML/JWT decode works, confirm no console CSP violations