upgrade to b6188#24

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xkong-anaconda wants to merge 18 commits intomain_b6082from

Commits on Nov 20, 2025

b6188
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Commits on Dec 1, 2025

Add GCC 12 pin for Linux CUDA builds (CUDA 12.4 requires gcc < 13)
xkong-anaconda
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Remove GCC pins - let conda auto-select version compatible with CUDA 12.4
xkong-anaconda
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Skip test-backend-ops on Metal for b6188 (Flash Attention not supported)
xkong-anaconda
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Add output_set skip conditions to prevent building both package sets together
xkong-anaconda
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Add Jinja2 workaround for undefined variables when output_set skips packages
xkong-anaconda
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Skip test-backend-ops on CUDA builds (has test failures in b6188)
xkong-anaconda
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Fix Windows c_stdlib_version in conda_build_config.yaml
xkong-anaconda
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Fix Windows CUDA build configuration and skip flaky test
xkong-anaconda
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