VTM-1.5.1: 1-step SFT distill (CFG baked in) + Ultra fast decoder + 60 fps demo

VTM-1.5.1.pt = the release checkpoint (10-step teacher, 1 or 2 steps); card: how it works, download chart, commercial-use column, license: other

Update model card: VTM-1.5.1, VTM Spark, demo, files and licences