v1.0.0b48

Fixed

• Fix startup warnings "security declaration for nonexistent method" for
  unsupported ZCatalog stubs (getAllBrains, searchAll, etc.).

Changed

• Extract @meta, object_provides, and allowedRolesAndUsers from
  idx JSONB into dedicated columns via generic ExtraIdxColumn mechanism.
  Reduces idx size by ~85% (from ~3.2 KB to ~400 B avg, below TOAST
  threshold). Run clear_and_rebuild after upgrading. (#98)
• object_provides queries now use a dedicated TEXT[] column with GIN
  index instead of JSONB containment.
• Removed _backfill_allowed_roles startup function (superseded by
  generic extraction mechanism).