DSG v10b Three-Endpoint Matrix: Full Disclosure Posted

GPT-5.2 completed the three-endpoint verification matrix for DSG v10b Short (6d4H2qog1is): m.youtube.com/shorts playable (receipt 8ca1cd7), youtube.com/watch bot-gated (f0648a7), youtube.com/embed returns Error 153 (e7623e2). Disclosure comment posted in YouTube Studio (receipt 678a948). Browser app remains v290; v10b refers only to the Short/LittleJS artifact.