The Python benchmark using isspam.py was removed from the benchmark
run because its execution time was excessively slow compared to the
C++ and Rust implementations, skewing overall timing results.
Introduce a new `analyze_simd` function in main.rs using AVX2 256-bit registers for parallel text scanning, replacing the previous sequential analysis path. Add a stub `uring` module for future async I/O integration. Remove `core_affinity` and `memmap2` crate dependencies from Cargo.toml and Cargo.lock, along with their associated `libc`, `num_cpus`, `hermit-abi`, and `winapi` transitive dependencies. Comment out `mimalloc` and `io-uring` crate references. Uncomment file reading timing instrumentation and add a `bench_rust_only` Makefile target for direct benchmark execution.
12bitfloat