- Disable now removes all policies (saved to DB) + Enable restores them
- Project add: policies are now user-selected (checkbox), not auto-attached
- Fix serializer allow_blank for optional fields (email/phone/password)
- Better error reporting for policy detach/attach failures
- Handle duplicate user creation with clear error message
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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