Recovers the embedded diffuse when the FBX references missing external
textures, discards animation-file objects keeping only their actions,
retargets bone-name prefixes (mixamorig vs mixamorig1) so clips recorded
for another character land on the base rig, and exports all clips as NLA
tracks for the dance director.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
