- Concurrency: superseded PR runs are cancelled; every merged main commit keeps its own run. - A version matrix runs in full on PRs and once on the push to main. - Prose files that no test reads skip CI on the push to main, and on PRs too where the repo has no required status check. Same pattern as the 2026-09-27 lumen/atelier/chord/pulse cleanup. Co-authored-by: Aoi <aoi@harem.world> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>