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script/tidy runs `go mod tidy` in a new tidy stage of the Dockerfile, on the test phase's Go image, and writes go.mod and go.sum back into the working tree with `docker build --output`. The test phase now runs `go mod tidy -diff` before the tests and fails naming `make tidy`; it comes first because a missing go.sum line otherwise fails the tests with Go's own message. Judgement call: script/tidy's build has no tag, unlike the other builds in script/: it makes no image. Model: opus-5-5