script/lint-darwin (make lint-darwin; run by script/check, and its
commands by the Dockerfile lint stage) runs go vet and golangci-lint
with GOOS=darwin and cgo off. Compiling cgo for macOS needs Apple's SDK,
and keychainunlocker.go uses go-keychain, which is cgo there, so it and
its tests are now built only with cgo on macOS, like internal/macse;
their stubs serve a macOS build without cgo. checkMacOSAvailable moves
to seunlocker_darwin.go. The findings in the newly checked files are
fixed, and lines over 88 columns in the unchecked ones are wrapped.
Model: opus-5-5
