First-run revealed:
1. Runner images (catthehacker/ubuntu:act-latest) lack cmake.
Added apt-get install step (cmake, build-essential, ninja-build,
zip, unzip, git, curl).
2. windows-latest matrix entry mapped to Linux fallback containers
(Davoryn runner pool currently Linux-only). Dropped from matrix
until Windows runner provisioned.
Other workflows (Cat-2 hybrid, etc.) likely need same fix when first
exercised — apply iteratively as consumers come online.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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