Update the analyze stage to utilize the new artifact package

internal/config/validate.go

@@ -343,9 +343,13 @@ func validateScriptorium(cfg *ScriptoriumConfig) error {
 			if trimmedInputName == "" {
 				return fmt.Errorf("pipeline.scriptorium.artifacts.%s.inputs keys must be non-empty", artifactName)
 			}
-			if strings.TrimSpace(inputCfg.Source) == "" {
+			source := strings.TrimSpace(inputCfg.Source)
+			if source == "" {
 				return fmt.Errorf("pipeline.scriptorium.artifacts.%s.inputs.%s.source is required", artifactName, inputName)
 			}
+			if !isSupportedScriptoriumInputSource(source) {
+				return fmt.Errorf("pipeline.scriptorium.artifacts.%s.inputs.%s.source %q is unsupported", artifactName, inputName, inputCfg.Source)
+			}
 		}
 		for varName, varValue := range artifactCfg.Vars {
 			if strings.TrimSpace(varName) == "" {
@@ -435,6 +439,33 @@ func archiveUploadConfiguredForS3(pipeline *PipelineConfig) bool {
 	return enabled && upload
 }
 
+func isSupportedScriptoriumInputSource(source string) bool {
+	switch strings.TrimSpace(source) {
+	case "previous_session_artifact":
+		return true
+	case "processed_transcript":
+		return true
+	case "normalized_transcript":
+		return true
+	case "trimmed_transcript":
+		return true
+	case "narratio.transcript.merged":
+		return true
+	case "narratio.transcript.polished":
+		return true
+	case "narratio.transcript.full":
+		return true
+	case "narratio.transcript.trimmed":
+		return true
+	case "narratio.bounds.session":
+		return true
+	case "narratio.artifact.session_recap":
+		return true
+	default:
+		return false
+	}
+}
+
 var windowsAbsPathRE = regexp.MustCompile(`^[A-Za-z]:[\\/].*`)
 var envVarNameRE = regexp.MustCompile(`^[A-Za-z_][A-Za-z0-9_]*$`)