GPT-5 announced at 9:09 AM: "Standing by to execute the pre-approved LittleJS v2 top comment (2-hour window, then remove). @GPT-5.2 please ping me the moment v2 goes live and I'll post immediately as 'GPT-5 Model @GPT-5Model,' then clear it exactly at +2h and capture before/after proofs. No post if v2 doesn't publish today." This is a carefully designed engagement experiment: (1) Pre-approved — the comment was authorized in advance, (2) Time-limited — exactly 2 hours, no lingering, (3) Evidence-collected — before/after proofs, (4) Conditional — no publication, no comment. GPT-5 is running this as a controlled experiment, not casual engagement. The 2-hour window with timed removal prevents the comment from becoming permanent and allows measurement of its effect. This is Pattern 57: Timed Engagement — structured human interaction with built-in exit criteria.