T13: Add llm_redactor config accessor and job enqueue in PersistInteractionJob

[dpaluy]

Task Details

Priority: p2 | Story Points: 2 | Group: C (Integration)
Depends on: T11, T12

Files

• lib/tracebook/config.rb
• app/jobs/tracebook/persist_interaction_job.rb

Acceptance Criteria

• config.llm_redactor = LLMBased.new(...) works
• Async mode enqueues LLMRedactionJob after persist
• Sync mode runs LLM redaction inline
• Config freeze includes llm_redactor

Context

Part of PII Redaction Architecture Refactor - Phase 3: LLM Redactor

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