- Refactor CORS middleware to echo request origin when wildcard + credentials
is configured (browsers reject Access-Control-Allow-Origin: * with
Access-Control-Allow-Credentials: true)
- Add _is_origin_allowed() and _cors_origin_header() helpers
- Use CORS_SUPPORTS_CREDENTIALS config consistently
- Ensure consistent Access-Control-Allow-Headers in all CORS paths
- Fix redirect validation in get_token() to allow wildcard CORS origins
- Add 46 unit tests covering encryption round-trips, idempotency, key
derivation, thread safety, CORS origin matching, and preflight responses
coryHawkvelt