Update the analyze stage to utilize the new artifact package

internal/config/scriptorium_test.go

@@ -116,6 +116,37 @@ func TestScriptoriumLoadAndValidate(t *testing.T) {
         output_kind: session_recap
 `,
 		},
+		{
+			name: "canonical artifact source is accepted",
+			scriptoriumYAML: `scriptorium:
+  binary: scriptorium
+  artifacts:
+    session_recap:
+      enabled: true
+      prompt_id: dnd.session_recap
+      output_path: artifacts/session_recap.md
+      inputs:
+        transcript:
+          source: narratio.transcript.trimmed
+          required: true
+`,
+		},
+		{
+			name: "unknown artifact source fails validation",
+			scriptoriumYAML: `scriptorium:
+  binary: scriptorium
+  artifacts:
+    session_recap:
+      enabled: true
+      prompt_id: dnd.session_recap
+      output_path: artifacts/session_recap.md
+      inputs:
+        transcript:
+          source: narratio.unknown
+          required: true
+`,
+			wantValidateErr: `pipeline.scriptorium.artifacts.session_recap.inputs.transcript.source "narratio.unknown" is unsupported`,
+		},
 		{
 			name: "artifact render_debug override is accepted",
 			scriptoriumYAML: `scriptorium:

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_]*$`)