models.json: pin labels and taxonomy checksums, update gallery metadata

models.json schema v2: family_meta + per-entry requirements (min_ram_mb, fp16 excludes)

add models.json: machine-readable index with backend support, input contract and checksums

checksums: add clean-named variants

Add perch-v2-int8-arm.onnx (clean canonical filename, add-only)

Add perch-v2-fp32-no-dft.onnx (clean canonical filename, add-only)

Add perch-v2-fp32.onnx (clean canonical filename, add-only)

checksums: add perch_v2_int8_arm.onnx

docs: document perch_v2_int8_arm variant

Add perch_v2_int8_arm.onnx (MatMul-only INT8, arm/low-RAM; ~64% less RAM vs fp32, identical top-1/top-5)

Upload folder using huggingface_hub

initial commit