Use communicator-backed direct mappings, remove RDMA paths, and flatten
the HT source layout.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 15f71a84-4219-4ae9-a87e-e5fab4205de6
This pull request makes significant improvements to the MoE (Mixture of
Experts) Python API and documentation, focusing on clarifying and
expanding the Expert Parallel (EP) interface, especially around
quantization, dispatch/combine handles, and overlap configuration. The
changes introduce new data structures, update function signatures, and
improve documentation to better reflect the current and planned
capabilities of the system. Additionally, the base development container
is updated to CUDA 13.0, and minor corrections are made to extension
naming.
