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>

.auto-claude-status

@@ -0,0 +1,25 @@
+{
+  "active": true,
+  "spec": "013-add-missing-critical-security-headers-csp-hsts-per",
+  "state": "building",
+  "subtasks": {
+    "completed": 4,
+    "total": 6,
+    "in_progress": 1,
+    "failed": 0
+  },
+  "phase": {
+    "current": "Verification",
+    "id": null,
+    "total": 2
+  },
+  "workers": {
+    "active": 0,
+    "max": 1
+  },
+  "session": {
+    "number": 1,
+    "started_at": "2026-01-25T11:52:38.088182"
+  },
+  "last_update": "2026-01-25T11:52:38.172045"
+}