The task runs ARM64, but the image asset had no explicit platform, so
the amd64 CD runner built an amd64 image (QEMU alone does not change
the default target). Revision :8 crash-looped with "exec format
error" (50 failed task starts); CloudFormation hung on service
stabilization until cancelled. Local arm64 builds masked this -
deploys from this Mac always produced the right image.
Same fix pattern as the org-wide QEMU+platform rule for arm64 Lambda
bundling.
