Add a framework mechanism for prepared modules and validators to contribute checkpoint identity fingerprints

internal/framework/pipeline/prepare.go

@@ -17,13 +17,14 @@ type PreparedPipeline struct {
 	ArtifactLanes []PreparedArtifactLane
 	Output        ModuleBinding
 
-	resolved        ResolvedPipeline
-	dependencies    ModuleDependencies
-	input           contracts.InputAdapter
-	chunker         contracts.Chunker
-	chunkValidators preparedValidatorChain
-	lanes           []preparedLaneExecutor
-	output          contracts.OutputEncoder
+	resolved               ResolvedPipeline
+	dependencies           ModuleDependencies
+	input                  contracts.InputAdapter
+	chunker                contracts.Chunker
+	chunkValidators        preparedValidatorChain
+	lanes                  []preparedLaneExecutor
+	output                 contracts.OutputEncoder
+	checkpointFingerprints []CheckpointFingerprint
 }
 
 type PreparedArtifactLane struct {
@@ -114,6 +115,10 @@ func Prepare(resolved ResolvedPipeline, registries Registries, deps ModuleDepend
 		return nil, constructionError(stable.ID, "", StageOutput, stable.Output.Module, "", err)
 	}
 	prepared.output = output
+	prepared.checkpointFingerprints, err = collectPreparedCheckpointFingerprints(prepared)
+	if err != nil {
+		return nil, err
+	}
 	return prepared, nil
 }