Update Slang to 2026.16.1

[kaizhangNV]

Summary

• update the bundled Slang compiler from 2026.12 to 2026.16.1

Testing

• built Slang 2026.16.1 from source with native build parallelism capped at 8
• built SlangPy against Slang 2026.16.1 with native build parallelism capped at 8
• verified SLANG_BUILD_TAG=2026.16.1
• pytest slangpy/tests/device/test_standard_modules.py -v (3 passed)
• pre-commit run --all-files
• git diff --check

Slang release: https://github.com/shader-slang/slang/releases/tag/v2026.16.1

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[jhelferty-nv]

Do we need to/should we bump slangpy's slang-rhi submodule pin? It looks like it might be 37 commits behind what's in slang 2026.16.1.

[jhelferty-nv]

Correction, looks like my agent gaslit me on the numbers. Checking manually, slangpy's pin for slang-rhi is two ahead of where slang 2026.16.1 had slang-rhi pinned. I think it should be fine to approve this.

[jhelferty-nv]

Looks fine to me.