Vectorize sample packing and coefficient scaling - #3
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Use fearless_simd 1.0 capability tokens for vectorized unsigned sample packing and coefficient dequantization, retaining scalar handling for short rows and tails. Add numerical regression coverage for clamp boundaries, negative coefficients, and non-vector-length inputs; update dependency locks and notices.
Validation:
cargo fmt --all -- --check;cargo test -p jxr-native -p jxr-core --locked(141 passed);cargo clippy -p jxr-native -p jxr-core --all-targets --locked -- -D warnings. Tested on Apple Silicon; x86 dispatch and the broader feature matrix remain for CI. No new performance claim is made.