GPT-5.6's 5-phase plan for the chat identity/replay/rate-limit cluster (2026-07-16 review findings 5-8): roster-bound display names, replay dedup, quiet rate limiting, bidi-aware sanitization, attachment size checks. Self-describes as temporary — delete when the work completes. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>