Adds _SAFE_IDENTIFIER regex guard before ATTACHing extract.duckdb files in the
read-only analytics connection, matching the same fix already applied in the
orchestrator. Adds test coverage for malicious directory names.
Schema v3: add is_public column to table_registry (default true).
src/rbac.py: can_access_table() checks admin bypass, public flag,
explicit permissions, wildcard bucket permissions.
API enforcement:
- manifest: filters tables by user access
- download: 403 if no access
- catalog: filters table list
- query: validates referenced tables against allowed list
New admin permissions API (/api/admin/permissions) for grant/revoke.
28 access control tests + 733 total tests passing.
