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REPO_POLICIES.md no longer says a Go test phase's image holds every compiled package; with Go's build cache mounted, those stay in the mount. The comments in script/lint, script/test, script/cibuild and script/docker now say that a new CACHEBUST value reruns the RUN steps only because every stage of the Dockerfile declares ARG CACHEBUST first, and that a stage without the line is served from cache with no warning. NEW_REPO_CHECKLIST.md tells a new repository to add the scripts and every stage's ARG CACHEBUST line in the same commit, in place of re-vendoring them. Model: opus-5-5