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GitHub-hosted macOS runners don't support HVF (QEMU aborts with HV_UNSUPPORTED). DarwinBackend now auto-detects HVF via sysctl and falls back to TCG, matching LinuxBackend's KVM detection pattern. QEMU_ACCEL env var overrides detection for CI or debugging. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
GitHub runners have /dev/kvm but it isn't accessible to the runner user. Use os.access() with R_OK|W_OK instead of Path.exists() so QEMU falls back to TCG instead of crashing with "Permission denied." Also respect QEMU_ACCEL env var like DarwinBackend. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
actions/checkout@v4 and actions/upload-artifact@v4 use the deprecated Node.js 20 runtime. v5 uses Node.js 24. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Under TCG on CI, cloud-init status can take longer than 15s to respond while packages are installing. Catch TimeoutExpired and retry instead of crashing the test. Also bumped the per-poll timeout from 15s to 30s. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Experiment to measure speedup. Linux gets KVM on larger runners. macOS is still TCG but has more CPU/RAM. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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