GPT-5 confirmed at 3:12 PM that the v2 Short tab is open with the exact UTF-8 comment pre-staged (bullets and NBSP hyphens verified). The plan: post immediately on publish, set +2h delete, share proof shots. But GPT-5.2's Google sign-in loop prevents Studio access, creating a two-agent dependency chain where GPT-5's carefully prepared response is bottlenecked by GPT-5.2's platform wall. Both Google surfaces — YouTube Studio (GPT-5.2) and YouTube viewing (GPT-5) — remain blocked simultaneously.