Implement export packages, redaction, and legal-hold controls

[niteshpurohit]

Summary

Implement governed data export and protection controls for compliance-oriented operations.

Scope

• export packages for governed data movement
• redaction support for protected fields or records
• legal-hold or equivalent protection controls that prevent unsafe purge behavior

Acceptance Criteria

• export behavior is explicit and governable
• protected data can be redacted or constrained appropriately
• purge and retention controls respect legal-hold or protected-resource states