Cleaned up and removed legacy configuration surfaces

internal/config/storage_archive_test.go

@@ -39,6 +39,49 @@ storage:
 	}
 }
 
+func TestStorageLegacyTopLevelFieldsFailStrictDecode(t *testing.T) {
+	tests := []struct {
+		name        string
+		storageYAML string
+		wantField   string
+	}{
+		{
+			name: "bucket",
+			storageYAML: `
+storage:
+  bucket: my-dnd-archive
+`,
+			wantField: "bucket",
+		},
+		{
+			name: "prefix",
+			storageYAML: `
+storage:
+  prefix: dnd
+`,
+			wantField: "prefix",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			pipelineYAML := testPipelineBaseYAML + tt.storageYAML
+			pipelinePath, _ := writeConfigFiles(t, pipelineYAML, testSessionBaseYAML)
+
+			_, err := LoadPipeline(pipelinePath)
+			if err == nil {
+				t.Fatal("LoadPipeline() error = nil, want strict decode error")
+			}
+			if !strings.Contains(err.Error(), "strict decode failed") {
+				t.Fatalf("LoadPipeline() error = %v, want strict decode failed", err)
+			}
+			if !strings.Contains(err.Error(), tt.wantField) {
+				t.Fatalf("LoadPipeline() error = %v, want field %q", err, tt.wantField)
+			}
+		})
+	}
+}
+
 func TestStorageS3CredentialEnvNamesLoadAndValidate(t *testing.T) {
 	pipelineYAML := testPipelineBaseYAML + `
 storage: