The mtlgemm Metal extension's metal_context.mm calls
at::mps::dispatch_sync_with_rethrow, which was added to that namespace
in PyTorch 2.11.0 (pytorch/pytorch#167445, merged 2025-11-11). Earlier
stable releases (2.6 – 2.10) only expose it under at::native::mps::,
so installing mtlgemm against them fails the C++ extension build.
torchvision pinned to >=0.26.0 (matches torch 2.11) to keep the
torch/torchvision wheel pair ABI-compatible on resolution.
