Complete refactor from AccessContext struct to simple accessorID string
parameter for RBAC enforcement, as requested. All access control remains
in lib layer - API/Portal just pass accessor + dossier to lib functions.
Changes:
- Added accessorIDFromContext() helper in lib/v2.go
- Updated all checkAccess() calls to extract accessorID from context
- Updated all EntryList() calls (nil → "" for system context)
- Fixed auth.go helper functions to extract accessorID
- Updated categories API to pass accessor through to lib
All RBAC enforcement stays in lib - no API-level access checks.
Empty accessorID bypasses checks (system/internal operations).
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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