T6: Update PersistInteractionJob with deserialize_actor

[dpaluy]

Task Details

Priority: p1 | Story Points: 2 | Group: B (Core Infrastructure)
Depends on: T4

Files

• app/jobs/tracebook/persist_interaction_job.rb

Acceptance Criteria

• deserialize_actor reconstructs actor from GlobalID or type/id
• Handles missing records gracefully (returns nil)
• Works with both GlobalID and type/id fallback

Context

Part of PII Redaction Architecture Refactor - Phase 1: Core Infrastructure

See full plan: docs/plans/260106-02b-pii-redaction-architecture.md