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script/fmt runs gofmt, goimports, and npx prettier, but bootstrap installed only git, make, go, and golangci-lint, so `make fmt` failed with `goimports: not found` on a fresh machine. bootstrap's contract is to install all dependencies idempotently. Add ensure_goimports: it skips when goimports is already on PATH, otherwise `go install`s golang.org/x/tools/cmd/goimports at a pinned exact version (v0.49.0; integrity via the Go module checksum database) and places the binary in /usr/local/bin so it is on PATH regardless of shell config, mirroring the golangci-lint release install. v0.49.0 requires Go 1.25, matching go.mod; v0.50.0 would force a Go 1.26 toolchain download. Model: opus-4-8