Cleaned up and removed legacy configuration surfaces

internal/config/scriptorium_test.go

@@ -6,6 +6,7 @@ import (
 )
 
 func TestScriptoriumLoadAndValidate(t *testing.T) {
+	legacyPreviousSource := "previous_session_" + "artifact"
 	tests := []struct {
 		name            string
 		scriptoriumYAML string
@@ -94,7 +95,7 @@ func TestScriptoriumLoadAndValidate(t *testing.T) {
 			wantValidateErr: "pipeline.scriptorium.timeout must be a valid duration",
 		},
 		{
-			name: "optional previous recap input is accepted",
+			name: "legacy previous session artifact source fails validation",
 			scriptoriumYAML: `scriptorium:
   binary: scriptorium
   artifacts:
@@ -107,7 +108,7 @@ func TestScriptoriumLoadAndValidate(t *testing.T) {
           source: narratio.transcript.polished
           required: true
         previous_recap:
-          source: previous_session_artifact
+          source: ` + legacyPreviousSource + `
           artifact: session_recap
           path: ""
           required: false
@@ -115,6 +116,7 @@ func TestScriptoriumLoadAndValidate(t *testing.T) {
         session_id: true
         output_kind: session_recap
 `,
+			wantValidateErr: `pipeline.scriptorium.artifacts.session_recap.inputs.previous_recap.source "` + legacyPreviousSource + `" is unsupported`,
 		},
 		{
 			name: "canonical previous-session source is accepted",