Resolve extraction reference bindings from config

internal/core/config/validation.go

@@ -98,11 +98,17 @@ func validatePipelineProfiles(profiles map[string]pipeline.PipelineProfile, llmP
 		if err := validateBindingLLMProfile(id, "", "output", profile.Output, llmProfiles); err != nil {
 			return err
 		}
+		if err := validateReferenceMap(id, "", profile.References); err != nil {
+			return err
+		}
 		for rawLaneID, lane := range profile.Artifacts {
 			laneID := strings.TrimSpace(rawLaneID)
 			if laneID == "" {
 				return fmt.Errorf("pipeline %q artifact lane id must not be empty", id)
 			}
+			if err := validateReferenceMap(id, laneID, lane.References); err != nil {
+				return err
+			}
 			if err := validateBindingLLMProfile(id, laneID, "extract", lane.Extract, llmProfiles); err != nil {
 				return err
 			}
@@ -122,6 +128,33 @@ func validatePipelineProfiles(profiles map[string]pipeline.PipelineProfile, llmP
 	return nil
 }
 
+func validateReferenceMap(pipelineID string, laneID string, references map[string]string) error {
+	seen := make(map[string]struct{}, len(references))
+	for rawSlotName, rawSource := range references {
+		slotName := strings.TrimSpace(rawSlotName)
+		if slotName == "" {
+			if laneID != "" {
+				return fmt.Errorf("pipeline %q lane %q reference slot name must not be empty", pipelineID, laneID)
+			}
+			return fmt.Errorf("pipeline %q reference slot name must not be empty", pipelineID)
+		}
+		if _, ok := seen[slotName]; ok {
+			if laneID != "" {
+				return fmt.Errorf("pipeline %q lane %q reference slot %q is duplicated after trimming", pipelineID, laneID, slotName)
+			}
+			return fmt.Errorf("pipeline %q reference slot %q is duplicated after trimming", pipelineID, slotName)
+		}
+		seen[slotName] = struct{}{}
+		if strings.TrimSpace(rawSource) == "" {
+			if laneID != "" {
+				return fmt.Errorf("pipeline %q lane %q reference slot %q source must not be empty", pipelineID, laneID, slotName)
+			}
+			return fmt.Errorf("pipeline %q reference slot %q source must not be empty", pipelineID, slotName)
+		}
+	}
+	return nil
+}
+
 func validateBindingLLMProfile(
 	pipelineID string,
 	laneID string,