完善 MACA 后端适配：CMake 校验、架构传递、contrib 入口与 Relax 外部库入口#41

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Zhao-Shi-jie wants to merge 4 commits into

MetaX-MACA:devfrom

Zhao-Shi-jie:mc_dev

Commits on Jul 10, 2026

[FIX][MACA] Avoid configure-time tvm-ffi mutation
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[FIX][MACA] Propagate arch and gate WMMA rules
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[FIX][MACA] Add mxcc contrib wrapper
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[FIX][MACA] Add Relax contrib entrypoint
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