refactor: remove legacy assistant compatibility

frontend/src/components/assistant-editor/debug-auto-test.tsx

@@ -447,34 +447,6 @@ function startupAssistantMessages(startup: BatchStartupResult): string[] {
   return [greeting, ...assistantMessages].filter(Boolean);
 }
 
-function legacyStartupRuntimeRecords(
-  startup: BatchStartupResult,
-): Array<Record<string, unknown>> {
-  return startup.autoConfirmedMessages.flatMap((message, index) => {
-    const confirmedAction =
-      message.actions?.find((action) => action.id === "confirmed") ??
-      message.actions?.[0];
-    const legacyId = `${index}-${message.title ?? message.message ?? "message"}`;
-    return [
-      {
-        eventId: `legacy-message-started-${legacyId}`,
-        event: "message_started",
-        phase: "opening",
-        requiresConfirmation: true,
-        messageTitle: message.title?.trim() || "未命名消息",
-        messageContent: message.message?.trim() || "（没有消息正文）",
-        messageActions: message.actions ?? [],
-      },
-      {
-        eventId: `legacy-message-completed-${legacyId}`,
-        event: "message_completed",
-        phase: "opening",
-        action: confirmedAction?.id?.trim() || "confirmed",
-      },
-    ];
-  });
-}
-
 function runtimeRecordKey(
   event: Record<string, unknown>,
   prefix: string,
@@ -514,10 +486,7 @@ function AutoTestTimeline({
     });
 
     const openingMessages = startupAssistantMessages(startup);
-    const records =
-      (startup.runtimeRecords?.length ?? 0) > 0
-        ? startup.runtimeRecords ?? []
-        : legacyStartupRuntimeRecords(startup);
+    const records = startup.runtimeRecords ?? [];
     const firstMessageStartedIndex = records.findIndex(
       (event) => event.event === "message_started",
     );