Add archive storage path configuration

internal/config/load_validate_test.go

@@ -820,6 +820,7 @@ func TestValidateMissingAudioSource(t *testing.T) {
 		},
 		Session: &SessionConfig{
 			SessionID: "2026-05-03",
+			Campaign:  "sample-campaign",
 			Inputs: SessionInputsConfig{
 				SpeakersFile:    "speakers.yml",
 				AutocorrectFile: "autocorrect.yml",
@@ -832,7 +833,7 @@ func TestValidateMissingAudioSource(t *testing.T) {
 	if err == nil {
 		t.Fatal("expected validation error, got nil")
 	}
-	if !strings.Contains(err.Error(), "audio_dir or at least one audio_files") {
+	if !strings.Contains(err.Error(), "audio_dir, at least one audio_files entry, or audio_s3") {
 		t.Fatalf("error = %q, want audio source guidance", err.Error())
 	}
 	if !strings.Contains(err.Error(), "session config") {
@@ -861,6 +862,12 @@ func writeConfigFiles(t *testing.T, pipelineYAML, sessionYAML string) (string, s
 		}
 		pipelineYAML += "audita:\n  binary: audita\n"
 	}
+	if !strings.Contains(sessionYAML, "\ncampaign:") && !strings.HasPrefix(sessionYAML, "campaign:") {
+		if !strings.HasSuffix(sessionYAML, "\n") {
+			sessionYAML += "\n"
+		}
+		sessionYAML += "campaign: sample-campaign\n"
+	}
 
 	dir := t.TempDir()
 	pipelinePath := filepath.Join(dir, "pipeline.yml")