HLSL 6.0 ... 6.9

[soufianekhiat]

Breaking changes

• Add support for HLSL 6.0 ... 6.9
• Add support for GPU Texture on d3d12compute

Details:

• Emit "//HALIDE_D3D12_SM XX" on HLSL version and being parsed to avoid complex infrastructure just to get that version KISS.
• Co-authored-by: Claude (all code formating, comments and mini_dxc.cpp was 100% written by Claude Opus 4.6)

Checklist

• Tests added or updated (not required for docs, CI config, or typo fixes)
• Documentation updated (if public API changed)
• Python bindings updated (if public API changed)
• Benchmarks are included here if the change is intended to affect performance.
• Commits include AI attribution where applicable (see Code of Conduct)

[soufianekhiat]

Is that possible to have a maintainer trigger the CI for this one please?