Centralize Go validation and build environments

build.go

@@ -54,10 +54,11 @@ type BuildResult struct {
 }
 
 // Build compiles the selected targets with Version injected through buildinfo.
-// It uses the prepared local Go environment, regenerates selected output files while preserving unrelated files,
-// and verifies the version command on the native host before succeeding. An
-// empty target set records source identity without running the Go toolchain.
-// Errors return partial build facts in the result.
+// It uses the available compatible local Go toolchain, applies ReleaseKit's
+// readonly offline build settings, preserves effective cache and tool settings,
+// and verifies the version command on the Go host before succeeding. An empty
+// target set records source identity without running the Go toolchain. Errors
+// return partial build facts in the result.
 func Build(ctx context.Context, request BuildRequest) (BuildResult, error) {
 	result, err := internalbuild.Build(ctx, internalbuild.Request{
 		RepositoryDir: request.RepositoryDir,