Run test-mcu-cortex-m-backend on ARM-related PR diffs#1

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Commits on Jan 27, 2026

Revert "[cortex_m] Fix linear weight layout: transpose in AOT pass, align meta/ref impl (#16782)"
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Configure test-mcu-cortex-m-backend to run on ARM-related diffs

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psiddh
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Add ARM paths to workflow-level pull_request trigger

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psiddh
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