velvetos-core 是做什么的？
Run Velvet Factory content autonomously through the Visual Foundry: real production/media proof, Asset Truth and Claim Provenance, Content Contract, Instagram decision passes, one shared Creative Manifest, specialist Creative Director/Media Librarian/Brand Guardian passes, progressive variants, targeted repair, HyperFrames/FFmpeg deterministic render, derivatives, fail-closed final quality gate, Exception Queue and Instagram publish/verification. Use for reels, stories, carousels, covers, produc