Yoast / duplicate-post / 23666955276

Pull #485

github

fix: address Copilot review feedback and improve test coverage

- Use per-post auth_callback for register_post_meta (edit_post cap
  instead of generic edit_posts).
- Fall back to post type name when rest_base is empty, matching the
  pattern used by WP core REST controllers.
- Only redirect collaborator on confirmed deletion (404/410/403), not
  on transient network errors.
- Improve register_post_meta unit test to verify config values.
- Add WP integration tests for R&R race condition: slot claiming,
  duplicate blocking, and rollback on failure.

Ref: Yoast/reserved-tasks#1127

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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