Restore comparability of completion metadata

completion_test.go

@@ -8,6 +8,14 @@ import (
 	commandmeta "gitea.maximumdirect.net/eric/CommandKit/internal/commandmeta"
 )
 
+// Existing consumer code can compare these metadata values or use them as keys.
+var (
+	_ map[FlagMeta]struct{}
+	_ map[ArgumentMeta]struct{}
+	_ = (FlagMeta{}) == (FlagMeta{})
+	_ = (ArgumentMeta{}) == (ArgumentMeta{})
+)
+
 func TestCompletionHintsFollowCapturedBindings(t *testing.T) {
 	type inner struct{ values Supplied[[]string] }
 	type outer struct{ flags FlagValues[inner] }