CUDA is a C++ superset, so .cu/.cuh files parse cleanly with
tree-sitter-cpp (already a dependency). Two registrations wire it up:
- detect.py: add .cu/.cuh to CODE_EXTENSIONS so they're detected and
watched (watch.py's _WATCHED_EXTENSIONS derives from CODE_EXTENSIONS).
- extract.py: route .cu/.cuh through extract_cpp in _DISPATCH, which
also makes collect_files() pick them up (_EXTENSIONS = _DISPATCH.keys()).
Adds tests/fixtures/sample.cu (kernel + __device__/host functions +
struct + includes) and CUDA cases in test_languages.py covering kernel/
device function extraction, structs, includes, and host call edges.
Documents the new extensions in the README extension table and CHANGELOG.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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