web3d-animation — decide how it moves, then make both halves agree

An animated scene fails at the seam between two people who never met: whoever made the clip and whoever plays it. The clip is named Armature|mixamo.com|Layer0, the code asks for run, the character slides, the death pose snaps back to a T-pose. This skill is the contract across that seam — the asset half and the runtime half, and the canon they share (references/clip-canon.md).

First action — inspect, then report