Previously, any GLB with keyframes on free bones would animate them,
even for standard animations like Idle. This caused accidental bone
hijacking — e.g., handcuffs freezing the player's head because the
artist keyframed all bones in Blender.
Now the Full prefix (FullIdle, FullStruggle, FullWalk) is enforced:
only Full-prefixed animations can animate free bones. Standard
animations (Idle, Struggle, Walk) only animate owned bones.
This aligns the code with the documented convention in ARTIST_GUIDE.md.
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