Stage CMS 0.5.0

Pages have stable identities, linked translations, application-owned bindings and public paths, and redirects for former published slugs. Required fields and publication rules validate the exact revision within the publication transaction. Schema 3 and export format 3 retain compatibility reads for formats 1 and 2. Upgrading from 0.4 requires a backup and the documented migration; rollback needs pre-upgrade data with the old code.

This Release records the existing immutable tag at c769ee8af62bfbbb9dc8729b9b4096b2a0500ed9; no tag or source history has been moved. It is a historical version. For new installations, use 0.5.1 and its current README, contribution guide, and operational limits.

Current public distribution and native checks are recorded on the 0.5.1 Release. This historical Release does not claim a new paid provider run or a separate fresh validation of this older checkout.