rlx-tensor 0.2.0

Host-side tensor kernels shared by SAM3, FLUX.2, and V-JEPA2
Documentation

Small host-side tensor kernels used by the native SAM3 bring-up.

Compute-heavy ops go through rlx_cpu::blas::sgemm_auto so we get Accelerate/OpenBLAS instead of naive Rust loops. The pure-Rust path falls back to a scalar gemm with the same signature (see rlx-cpu/src/blas.rs).