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)

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