Contributing
============

Code must pass the full review checklist before merge (see top-level README).

1. ``clang-format`` diff is empty.
2. ``clang-tidy`` has zero new warnings.
3. ASan + UBSan — no memory errors in debug build.
4. Vulkan validation layers — clean in debug.
5. All tests pass — ``ctest --output-on-failure``.
6. No benchmark regressions > 10%.
7. Shader output matches CPU reference.

Commit style: concise imperative subject, body only when useful.