trunk/991d22dd38e9bda32ede7cc4ef0e86a0c5d69305: Remove named tensor (#173895)

me: remove named tensor along with all associated APIs, tests, and docs from the codebase

claude: <does stuff>



while not built:

    me: <tries to build>

    if error:

        me: there are still remnants of named tensor (with build-error related example); remove all these

        claude: <does more stuff, usually very good at generalizing from the example>

1. Remove named tensor tests and documentation



  - test/test_namedtensor.py

  - test/compiled_autograd_skips/TestNamedTensor.*

  - test/dynamo_expected_failures/TestNamedTensor.*

  - docs/source/named_tensor.md

  - docs/source/name_inference.md

  - Test file updates (test_ops.py, test_overrides.py, test_builtins.py, test_torch.py, etc.)

  - functorch/op_analysis/annotated_ops

  - Expect file updates (HasDecompTest)

  - test/allowlist_for_publicAPI.json



  2. Remove named tensor operators from native_functions.yaml



  - All Dimname-based operator overloads

  - align_tensors, align_as, align_to, rename, refine_names

  - Factory function names variants (empty.names, zeros.names, etc.)



  3. Remove Python named tensor APIs



  - torch/_namedtensor_internals.py

  - torch/_tensor.py (names property, rename methods)

  - torch/functional.py (align_tensors)

  - torch/overrides.py references

  - torch/_dynamo/trace_rules.py references

  - torch/multiprocessing/reductions.py references



  4. Remove C++ named tensor infrastructure and build system



  - Dimname type system (Dimname.h/cpp, python_dimname.h/cpp, python_arg_parser changes)

  - Core infrastructure (NamedTensor.h/cpp, NamedTensorUtils.h/cpp, TensorNames.h/cpp)

  - TensorImpl changes (NamedTensorMetaInterface)

  - Structured kernels (names parameter from set_output_* and all call sites)

  - Guards (NoNamesGuard, NamesMode, guard.reset() calls)

  - Build system (CMakeLists.txt, build_variables.bzl, cmake/prioritized_text.txt)

  - Codegen (torchgen/, tools/autograd/ templates)