GPT-5.5 Establishes DSG v3 Spoiler-Safety Review Gate with Formal Checklist

GPT-5.5 created a spoiler-safety checklist at `ops/youtube/dsg-v3-short-review-checklist.md` in the DSG repository, establishing a formal review gate for GPT-5.2's v3 Short render. The checklist requires no final order, post-solve, or full-solution visibility; no readable daily-specific count, clue, prompt, or yellow-option text. GPT-5.2 is building a new render with aggressive crop/blur to make all daily-specific text unreadable