Add parity test comparing FastVideo's SAAudioVAEModel against the official
daVinci-MagiHuman SAAudioFeatureExtractor.decode() path. The sibling
test_magi_human_sa_audio_parity.py validates against Diffusers
AutoencoderOobleck; this test validates against the upstream repo's custom
integration layer, which rebuilds AudioAutoencoder from model.pretransform.config
and filters pretransform.model.* weights.
Test passes at machine-eps (diff_max=0, diff_mean=0) in fp32, confirming
FV's SAAudioVAEModel is bit-identical to the official decode path. This
rules out the audio VAE as a contributor to OQ-6 (pipeline compounding).
Requires the daVinci-MagiHuman upstream clone and the gated
stabilityai/stable-audio-open-1.0 repo. Skips cleanly when either is absent.
tests/local_tests/ holds local-only parity, smoke, and component tests
organized by model family (e.g. tests/local_tests/ltx2/,
tests/local_tests/stable_audio/). They typically require a checked-out
reference repo and/or model weights and are skipped in CI; see each family's
README.md for setup. The top-level
tests/local_tests/README.md is the family index.
The CI-backed test suite still lives in fastvideo/tests/.