Add validator chain provenance

internal/core/artifacts/artifacts.go

@@ -38,10 +38,21 @@ type ArtifactLaneManifest struct {
 	Extractor  string         `json:"extractor"`
 	Merger     string         `json:"merger"`
 	Normalizer string         `json:"normalizer"`
-	Validators []string       `json:"validators,omitempty"`
 	Metadata   map[string]any `json:"metadata,omitempty"`
 }
 
+type ValidatorChainManifest struct {
+	Stage      string              `json:"stage"`
+	LaneID     string              `json:"lane_id,omitempty"`
+	ModuleKey  string              `json:"module_key"`
+	Validators []ValidatorManifest `json:"validators"`
+}
+
+type ValidatorManifest struct {
+	Key            string `json:"key"`
+	ExecutionClass string `json:"execution_class"`
+}
+
 type LLMProfileManifest struct {
 	ID       string `json:"id"`
 	Provider string `json:"provider,omitempty"`
@@ -100,6 +111,7 @@ type RunManifest struct {
 	OutputEncoder     string                     `json:"output_encoder,omitempty"`
 	ModuleMetadata    map[string]map[string]any  `json:"module_metadata,omitempty"`
 	ArtifactLanes     []ArtifactLaneManifest     `json:"artifact_lanes,omitempty"`
+	ValidatorChains   []ValidatorChainManifest   `json:"validator_chains,omitempty"`
 	References        []ReferenceProvenance      `json:"references,omitempty"`
 	NormalizedOutputs []NormalizedOutputManifest `json:"normalized_outputs,omitempty"`
 	RejectedOutputs   []RejectedOutputManifest   `json:"rejected_outputs,omitempty"`