Make macOS support best effort

scripts/release-check.sh

@@ -81,7 +81,8 @@ run_go "$newer_toolchain" test ./examples/consumers
 run_go "$newer_toolchain" test . -run '^TestLocalDocumentationLinks$'
 run_go "$newer_toolchain" test . -run '^TestDependencyImportBoundary$'
 
-for target in linux/amd64 linux/arm64 darwin/amd64 darwin/arm64; do
+# Only release-validated targets gate publication; macOS is best-effort.
+for target in linux/amd64 linux/arm64; do
   target_os=${target%/*}
   target_arch=${target#*/}
   GOTOOLCHAIN="$newer_toolchain" GOPROXY=off CGO_ENABLED=0 GOOS="$target_os" GOARCH="$target_arch" go build ./...