fix: update zyx-optim Cargo.toml

version 0.15.4

version bump

Release 0.15.2: Fix MNIST example and WGPU buffer size limits

Fix CI wheel upload paths

Upload steps were looking in wrong directory.
Wheels are built to dist/ (repo root), not zyx-py/dist/
Also removed auto-initialize from zyx/Cargo.toml (caused static linking errors).

moved xys safetensors

Zyx release v0.13.0

getting cargo workspace to work

concrete tch version

version 0.11.2