1. NAMESPACE is a PHP reserved keyword — renamed to REST_NAMESPACE
in the REST controller. This caused a parse error on activation.
2. Autoloader can't resolve PR_Core class — the class name equals the
autoloader prefix exactly, so stripping "PR_Core_" yields an empty
suffix and the wrong filename. Added explicit require_once in
bootstrap, same pattern as PRAutoBlogger.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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