unreal: distill the Windows host-mode CI learnings (2026-08-25) - #5
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Items 13-14 in section B, distilled from the private repo's unreal LEARNINGS 17-18: native-Windows host-mode runner as the working path for Win64 BuildCookRun (warm shared DDC), plus the six Windows/ps1 CI traps (ssh-killed runner daemons, PowerShell exit-code lies, ephemeral host-mode workspaces, upload-artifact v4 GHES gate, artifact retention, node-bearing GPU images). Also update DISTILLING.md step 8: distill passes now land as distill/* branch PRs for human review, never direct pushes to main. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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What
Distill pass per DISTILLING.md: carries the private repo's 2026-08-25 unreal CI learnings (private items 17-18) into
unreal/LEARNINGS.mdsection B as items 13-14.BuildCookRunin CI wants a native-Windows host-mode runner; build logic lives in a repo script, warm shared DDC is why CI is fast (~5 min warm vs ~1 hr cold). Carries the⤳skillflag forunreal-build.powershell -Fileexit-code lies, ephemeral host-mode workspaces,upload-artifact@v4GHES gate, artifact retention sizing, node-bearing images for GPU docker-mode jobs.Process change
DISTILLING.md step 8 now says distill passes land as
distill/*branch PRs for human review (this PR is the first one under that rule); direct pushes to main are out.Sanitization
Line count: unreal/LEARNINGS.md 146 -> 172 (26 lines of new distilled material; no existing entries needed trimming - the file has no redundancy with the new items beyond the item-10 fold noted above).
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