Refactor validators into package-owned components

internal/validators/metadata/metadata.go

@@ -0,0 +1,55 @@
+package metadata
+
+import "gitea.maximumdirect.net/eric/audita/internal/framework/contracts"
+
+type ExecutionClass string
+
+const (
+	ExecutionClassDeterministic ExecutionClass = "deterministic"
+	ExecutionClassLLMBacked     ExecutionClass = "llm_backed"
+)
+
+type ClassifiedValidator interface {
+	contracts.Validator
+	ExecutionClass() ExecutionClass
+}
+
+func ClassOf(v contracts.Validator) ExecutionClass {
+	if v == nil {
+		return ExecutionClassDeterministic
+	}
+	classified, ok := v.(ClassifiedValidator)
+	if !ok {
+		return ExecutionClassDeterministic
+	}
+	switch classified.ExecutionClass() {
+	case ExecutionClassLLMBacked:
+		return ExecutionClassLLMBacked
+	case ExecutionClassDeterministic:
+		return ExecutionClassDeterministic
+	default:
+		return ExecutionClassDeterministic
+	}
+}
+
+func Wrap(v contracts.Validator, class ExecutionClass) contracts.Validator {
+	if v == nil {
+		return nil
+	}
+	if class != ExecutionClassLLMBacked {
+		class = ExecutionClassDeterministic
+	}
+	return wrappedValidator{
+		Validator: v,
+		class:     class,
+	}
+}
+
+type wrappedValidator struct {
+	contracts.Validator
+	class ExecutionClass
+}
+
+func (w wrappedValidator) ExecutionClass() ExecutionClass {
+	return w.class
+}