Bind optimizer redistribution topology per bucket - #4056
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Summary:
DeviceMeshto each optimizerBucketSpecand interpret owner ranks within that meshBucketConfigentries against named DTensor mesh axes after model parallelizationTest plan:
pytest tests/unit_tests/test_bucketed_optimizer_redistribution.py tests/unit_tests/test_muon_parameter_prep.py tests/unit_tests/test_deepseek_v3_distributed_muon_config.py -qpytest tests/unit_tests/test_distributed_muon.py::TestDistributedMuon::test_constructor_rejects_storage_shards_that_split_matrices tests/unit_tests/test_distributed_muon.py::TestTensorParallelDistributedMuon::test_distinct_bucket_meshes_use_mesh_local_owners -q(4 GPUs)