[codex] Add scalar pointer out-return support

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Summary

Adds scalar pointer output support for out_return argument intents. APIs with output parameters such as unsigned int* singleMipLevel can now be exposed as returned scalar values, so a C++ shape like uint4 texture_footprint(..., unsigned int*) can compile to a Numba-facing tuple result like (footprint, single_mip).

The implementation records which out_return parameters are pointer outputs, derives the returned Numba type from the pointee type, allocates hidden scalar storage, passes the expected pointer slot through the shim ABI, and materializes the scalar after the call. The same helper path is wired through dynamic functions, templated functions, struct/class-template methods, and static binding rendering.

Validation

• PYTHONPATH=/home/wangm/numbast-optix/numbast-scalar-pointer-out/numbast/src:/home/wangm/numbast-optix/numbast-scalar-pointer-out/ast_canopy pytest -q numbast/tests/test_intent.py numbast/tests/test_deduction.py numbast/src/numbast/static/tests/test_function_static_bindings.py::test_scalar_pointer_out_return_static_rendering
• PYTHONPATH=/home/wangm/numbast-optix/numbast-scalar-pointer-out/numbast/src:/home/wangm/numbast-optix/numbast-scalar-pointer-out/ast_canopy python -m py_compile numbast/src/numbast/intent.py numbast/src/numbast/intent_defs.py numbast/src/numbast/intent_utils.py numbast/src/numbast/callconv.py numbast/src/numbast/function.py numbast/src/numbast/function_template.py numbast/src/numbast/struct.py numbast/src/numbast/class_template.py numbast/src/numbast/static/function.py numbast/src/numbast/static/struct.py numbast/tests/test_intent.py numbast/tests/test_function.py numbast/src/numbast/static/tests/test_function_static_bindings.py

CUDA end-to-end tests were attempted locally but the environment has no CUDA device (CUDA_ERROR_NO_DEVICE).

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/scalar-pointer-out

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