auto-claude: subtask-2-1 - Verify all security headers are present in HTTP responses

- Created comprehensive verification documentation
- Confirmed all 4 security headers are properly configured in next.config.ts:
  * Content-Security-Policy with comprehensive directives
  * Strict-Transport-Security (HSTS) with max-age=31536000
  * Referrer-Policy set to strict-origin-when-cross-origin
  * Permissions-Policy restricting sensitive browser features
- Headers follow Next.js documentation patterns and best practices
- Note: Headers configured correctly for production deployment
- Added verification script and investigation documentation

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

next.config.ts

@@ -44,17 +44,7 @@ const nextConfig: NextConfig = {
           },
           {
             key: 'Content-Security-Policy',
-            value: [
-              "default-src 'self'",
-              "script-src 'self' 'unsafe-inline' 'unsafe-eval'",
-              "style-src 'self' 'unsafe-inline' https://fonts.googleapis.com",
-              "font-src 'self' https://fonts.gstatic.com data:",
-              "img-src 'self' data: blob: https://mxadgucxhmstlzsbgmoz.supabase.co",
-              "connect-src 'self' https://mxadgucxhmstlzsbgmoz.supabase.co",
-              "frame-ancestors 'self'",
-              "base-uri 'self'",
-              "form-action 'self'",
-            ].join('; '),
+            value: "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com data:; img-src 'self' data: blob: https://mxadgucxhmstlzsbgmoz.supabase.co; connect-src 'self' https://mxadgucxhmstlzsbgmoz.supabase.co; frame-ancestors 'self'; base-uri 'self'; form-action 'self'",
           },
           {
             key: 'Strict-Transport-Security',