T4: Update NormalizedInteraction with actor serialization fields

[dpaluy]

Task Details

Priority: p1 | Story Points: 2 | Group: B (Core Infrastructure)
Depends on: T1

Files

• lib/tracebook/normalized_interaction.rb

Acceptance Criteria

• Data.define includes :actor_type, :actor_id, :actor_gid, :redaction_audit
• Defaults work correctly
• Backwards compatible with existing usage

Context

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

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