Validate normalize retry diagnostics

internal/framework/contracts/typed_pipeline.go

@@ -95,6 +95,11 @@ type TypedNormalizeResult[T any] struct {
 
 // NormalizeRetry asks the framework to retry normalization while retaining a
 // safe candidate for acceptance if the retry budget is exhausted.
+const (
+	MaxNormalizeRetryReasonCodeBytes = 128
+	MaxNormalizeRetryMessageBytes    = 4096
+)
+
 type NormalizeRetry struct {
 	ReasonCode       string
 	Message          string