- Remove wp_strip_all_tags/sanitize_text_field stubs from bootstrap
(Brain Monkey manages these via Functions\when() in individual tests;
defining them early triggers Patchwork's DefinedTooEarly error)
- Add WP_Error class stub to bootstrap (class, not function — safe for
Patchwork) so model registry and image pipeline tests can use it
- Replace WP_Error_Stub with standard WP_Error in model registry test
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>