Add v5 AU->mesh PLS (Detectorv2 v2.5 space), canonical frontal frame; new default replacing v4

Add v4 AU→mesh PLS (Detectorv2 v2.4, 20-AU Feat space; frontalized + aspect-corrected)

Switch v3 PLS to standard (AU+pose) fit; noid was overfit to the 4 dropped dead AUs

Add v3 (Detectorv2 24-AU, identity-removed) PLS model

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initial commit