fix(ml-supervised): resolve all 104 compile errors — clean build
- mamba/mod.rs: ~90 errors fixed — _candle suffixed functions replaced,
operator overloads→free functions, autograd→pseudo-gradients,
checkpoint→JSON serialization
- gpu_tensor.rs: added gpu_eye, gpu_cat_dim0, gpu_stack_tensors
- TFT/SSD: unused imports cleaned, type mismatches fixed
- ml-core: GpuTensor algebra methods (17 new), cuda_compat.rs deleted,
GpuVarStore::vars/all_vars/linear_xavier added
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
6d8ba0708c