- Replace workspace ownership check with explicit SYSTEM_ADMIN_IDS env var
- System admin access is now explicit and configurable via environment
- Workspace owners no longer automatically get system admin privileges
- Add 15 unit tests verifying security separation
- Add SYSTEM_ADMIN_IDS documentation to .env.example
Refs #338
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
