style(utils): trim RunQemuImg godoc + move subprocess marker inline

utils/qemuimg.go

@@ -7,20 +7,15 @@ import (
 	"strings"
 )
 
-// RunQemuImg shells out to qemu-img with the supplied args (e.g.
-// "create", "-f", "qcow2", ...) and wraps any non-zero exit with the
-// trimmed combined output. Use this for operations that have no
-// meaningful stdout (create, resize, convert). For queries that need
-// a clean stdout payload — e.g. `info --output=json` — call
-// exec.CommandContext directly.
-//
-// cocoon shells out to qemu-img because there is no mature Go qcow2
-// writer that covers create/resize/convert with the same fidelity;
-// upstream qemu-img is authoritative for the disk-format matrix.
+// RunQemuImg shells out to qemu-img and wraps any non-zero exit with the
+// trimmed combined output. Use this for operations without meaningful
+// stdout (create, resize, convert); for queries that need a clean stdout
+// payload (e.g. `info --output=json`), call exec.CommandContext directly.
 func RunQemuImg(ctx context.Context, args ...string) error {
 	if len(args) == 0 {
 		return fmt.Errorf("qemu-img: no args")
 	}
+	// shell out because no Go qcow2 writer covers create/resize/convert at qemu-img's fidelity.
 	out, err := exec.CommandContext(ctx, "qemu-img", args...).CombinedOutput() //nolint:gosec
 	if err != nil {
 		return fmt.Errorf("qemu-img %s: %s: %w", args[0], strings.TrimSpace(string(out)), err)