gcc16 warning patch on pybind

[cliffburdick]

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[greptile-apps]

Greptile Summary

This PR patches a GCC 16 compiler warning by wrapping the pybind11/embed.h and pybind11/numpy.h includes in pybind.h with the existing MATX_IGNORE_WARNING_PUSH_GCC/MATX_IGNORE_WARNING_POP_GCC macros to suppress -Wnull-dereference false positives.

• The macros are defined in defines.h and are no-ops for Clang and other non-GCC compilers, so there is no impact on non-GCC builds.
• The pattern is consistent with at least a dozen other sites in the codebase (e.g., tensor_impl.h, svd_lapack.h, einsum.h, etc.) that suppress other GCC-specific warnings the same way.
• The suppression scope is correctly minimal — only the two pybind11 headers are wrapped, while the subsequent standard-library includes (<optional>, <filesystem>) are intentionally left outside the suppressed range.
• defines.h is guaranteed to be included before this code executes because pybind.h includes matx/core/type_utils.h → matx/core/half.h → matx/core/defines.h at the top of the file.

Confidence Score: 5/5

• This PR is safe to merge — it is a minimal, targeted warning-suppression patch with no functional changes.
• The change is two lines added and uses a macro pattern already proven correct in more than a dozen locations across the codebase. It is a no-op on Clang and other non-GCC compilers, the macro definitions are already in scope, and the scope of suppression is the tightest possible (only the two pybind11 headers). No logic, interface, or data is modified.
• No files require special attention.

Important Files Changed

Filename	Overview
include/matx/core/pybind.h	Wraps pybind11 includes with GCC-specific -Wnull-dereference warning suppression macros, using an already well-established pattern throughout the codebase.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["pybind.h included"] --> B{"MATX_ENABLE_PYBIND11\ndefined?"}
    B -- No --> Z["No pybind11 code compiled"]
    B -- Yes --> C["MATX_IGNORE_WARNING_PUSH_GCC\n('-Wnull-dereference')"]
    C --> D{"Compiler?"}
    D -- "GCC" --> E["_Pragma: GCC diagnostic push\n_Pragma: GCC diagnostic ignored -Wnull-dereference"]
    D -- "Clang / other" --> F["No-op (macro expands to nothing)"]
    E --> G["#include pybind11/embed.h\n#include pybind11/numpy.h"]
    F --> G
    G --> H["MATX_IGNORE_WARNING_POP_GCC"]
    H --> I{"Compiler?"}
    I -- "GCC" --> J["_Pragma: GCC diagnostic pop\n(restores previous warning state)"]
    I -- "Clang / other" --> K["No-op"]
    J --> L["#include optional\n#include filesystem\n(no suppression)"]
    K --> L

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[cliffburdick]

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