feat: add basic forked shell record to in/out files

internal/miro/errors.go

@@ -0,0 +1,11 @@
+package miro
+
+var (
+	ErrRecordingDiscarded = RecordingDiscardedError{}
+)
+
+type RecordingDiscardedError struct{}
+
+func (RecordingDiscardedError) Error() string {
+	return "recording discarded"
+}