add aiter namespace to rope

[valarLip]

Motivation

Technical Details

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[Copilot]

Pull Request Overview

Namespace introduction for rope kernels and associated interface updates.

• Wrap rope helper functions in the aiter namespace and adjust consumers.
• Add using directive in CUDA kernel TU to pick up names from aiter.
• Expand pybind registrations with explicit argument names.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
csrc/kernels/rope/rope_common.h	Wrap rope helper functions with namespace aiter and close it before macro definitions.
csrc/kernels/rope/pos_fwd_kernels.cu	Add using namespace aiter to access newly namespaced symbols.
csrc/include/rocm_ops.hpp	Reformat pybind definitions and add explicit py::arg names for rope_cached_positions_2c_fwd_impl.
aiter/jit/core.py	Minor docstring normalization tweak in check_args.

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