Separate comparison side selectors

integrations/ckconfig/contracts.go

@@ -141,6 +141,9 @@ type Selector[I any] struct {
 	Binding commandkit.Flag[I]
 	// Scopes lists the scope names that receive this flag's value.
 	Scopes []string
+	// AgainstName optionally declares the long name of an independent
+	// right-side comparison flag using the same parser and setter.
+	AgainstName string
 }
 
 // Suite declares the typed input, shared state, selectors, and configuration