Security improvements and API compatibility fixes (v0.3.6)

- Add recursive key sorting for response signing compatibility
- Fix IP header spoofing in rate limiting with trusted proxy support
- Add CSRF protection to CSV export with nonce verification
- Explicit Twig autoescape for XSS prevention
- Escape status values in CSS classes
- Update README with security documentation and trusted proxy config
- Update translations for v0.3.6

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

CHANGELOG.md

@@ -7,6 +7,34 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.6] - 2026-01-23
+
+### Security
+
+- Added CSRF protection (nonce verification) to CSV export functionality
+- Fixed IP header spoofing vulnerability in rate limiting - now requires explicit trusted proxy configuration
+- Enabled explicit Twig autoescape for XSS protection
+- Fixed unescaped status values in CSS classes in Twig templates
+
+### Fixed
+
+- Fixed response signing to use recursive key sorting for client compatibility
+- ResponseSigner now recursively sorts nested array keys alphabetically as required by client implementation
+
+### Changed
+
+- Rate limiting now only trusts proxy headers when `WC_LICENSE_TRUSTED_PROXIES` constant is defined
+- Added Cloudflare IP range support via `WC_LICENSE_TRUSTED_PROXIES = 'CLOUDFLARE'` configuration
+- Improved IP detection with CIDR notation support for trusted proxy ranges
+
+### Technical Details
+
+- Added `recursiveKeySort()` method to `ResponseSigner` for proper response signing
+- Added `isTrustedProxy()`, `isCloudflareIp()`, and `ipMatchesCidr()` methods to `RestApiController`
+- Twig environment now explicitly sets `autoescape => 'html'`
+- Export CSV link now includes nonce via `wp_nonce_url()`
+- Added `export_csv_url()` Twig function for generating export URL with nonce
+
 ## [0.3.5] - 2026-01-23
 
 ### Added