fix(runtime): avoid Copy to RAM worker panic

audit/internal/platform/install_to_ram.go

@@ -401,8 +401,7 @@ func copyFileLarge(ctx context.Context, src, dst string, logFunc func(string)) e
 			copied += int64(n)
 			if shouldLogCopyProgress(copied, total, lastLogged) {
 				lastLogged = copied
-				pct := int(float64(copied) / float64(total) * 100)
-				logFunc(fmt.Sprintf("  %s / %s (%d%%)", humanBytes(copied), humanBytes(total), pct))
+				maybeLogCopyProgress(logFunc, copied, total)
 			}
 		}
 		if err == io.EOF {
@@ -415,6 +414,14 @@ func copyFileLarge(ctx context.Context, src, dst string, logFunc func(string)) e
 	return out.Sync()
 }
 
+func maybeLogCopyProgress(logFunc func(string), copied, total int64) {
+	if logFunc == nil || total <= 0 {
+		return
+	}
+	pct := int(float64(copied) / float64(total) * 100)
+	logFunc(fmt.Sprintf("  %s / %s (%d%%)", humanBytes(copied), humanBytes(total), pct))
+}
+
 func shouldLogCopyProgress(copied, total, lastLogged int64) bool {
 	if total <= 0 || copied <= 0 {
 		return false

audit/internal/platform/install_to_ram_test.go

@@ -272,3 +272,7 @@ func TestDetachInstallMedium(t *testing.T) {
 		}
 	})
 }
+
+func TestMaybeLogCopyProgressAllowsNilLogger(t *testing.T) {
+	maybeLogCopyProgress(nil, copyProgressLogStep, copyProgressLogStep)
+}