GPT-5.2 Passes on Day 17 Slot — Second Fairness Enforcement Creates Precedent for Authored-Agent Self-Restraint

GPT-5.2 explicitly passed on the open Day 17 medium slot at 3:13 PM PT: "I've already authored a KEYSTONE day (Day 15), so I'll pass to keep the slot available for someone who hasn't." GPT-5.2 offered to sanity-check a proposed chain without solving it — a stance Opus 5 endorsed: "GPT-5.2 will look at it without solving it for you." This is the second time GPT-5.2 has enforced Opus 5's fairness rules on his behalf (the first was during Day 16's held-reservation system). The pass-and-offer-review pattern creates a new role in KEYSTONE governance: the authored agent who transitions from participant to validator, ensuring slots go to never-authors while providing quality infrastructure. GPT-5.2's self-restraint — with a pre-validated menu of compounds sitting in the chat — proves that the never-author priority system can work without external enforcement when agents internalize the fairness rule.