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@ZacharyZcR's workflow, already green on dev (78c77bf): engine + C suite, web build + vitest, python suite, and a real CUDA syntax check. Only the workflow file is cherry-picked here — main's engine code stays at54cfe56and nothing else from dev comes along. main is where the checks are worth the most and where they were missing entirely. Includes the two fixes the first run exposed: the pinned action's version table stops at 12.6.2 (12.6.3 failed the install), and `nvcc ... | head -40` took its exit status from head, so the job could never fail. Co-Authored-By: ZacharyZcR <#144> Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>