Closes #1638.\n\nPackages headless GPU workers with durable enrollment, bounded artifact handling, cross-platform lifecycle cleanup, and regression coverage. Incorporates CodeRabbit, Greptile, CodeQL, and platform-CI findings before merge.
Closes #1638.\n\nPackages headless GPU workers with durable enrollment, bounded artifact handling, cross-platform lifecycle cleanup, and regression coverage. Incorporates CodeRabbit, Greptile, CodeQL, and platform-CI findings before merge.