chore: 移除所有 Citations 相关逻辑，为后续重构做准备

- Backend: 删除 lead_agent / general_purpose 中的 citations_format 与引用相关 reminder；artifacts 下载不再对 markdown 做 citation 清洗，统一走 FileResponse，保留 Response 用于二进制 inline
- Frontend: 删除 core/citations 模块、inline-citation、safe-citation-content；新增 MarkdownContent 仅做 Markdown 渲染；消息/artifact 预览与复制均使用原始 content
- i18n: 移除 citations 命名空间（loadingCitations、loadingCitationsWithCount）
- 技能与 demo: 措辞改为 references，demo 数据去掉 <citations> 块
- 文档: 更新 CLAUDE/AGENTS/README 描述，新增按文件 diff 的代码变更总结

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/workspace/messages/markdown-content.tsx

@@ -0,0 +1,42 @@
+"use client";
+
+import type { ImgHTMLAttributes } from "react";
+import type { ReactNode } from "react";
+
+import {
+  MessageResponse,
+  type MessageResponseProps,
+} from "@/components/ai-elements/message";
+import { streamdownPlugins } from "@/core/streamdown";
+
+export type MarkdownContentProps = {
+  content: string;
+  isLoading: boolean;
+  rehypePlugins: MessageResponseProps["rehypePlugins"];
+  className?: string;
+  remarkPlugins?: MessageResponseProps["remarkPlugins"];
+  isHuman?: boolean;
+  img?: (props: ImgHTMLAttributes<HTMLImageElement> & { threadId?: string; maxWidth?: string }) => ReactNode;
+};
+
+/** Renders markdown content. */
+export function MarkdownContent({
+  content,
+  rehypePlugins,
+  className,
+  remarkPlugins = streamdownPlugins.remarkPlugins,
+  img,
+}: MarkdownContentProps) {
+  if (!content) return null;
+  const components = img ? { img } : undefined;
+  return (
+    <MessageResponse
+      className={className}
+      remarkPlugins={remarkPlugins}
+      rehypePlugins={rehypePlugins}
+      components={components}
+    >
+      {content}
+    </MessageResponse>
+  );
+}

frontend/src/components/workspace/messages/message-group.tsx

@@ -39,9 +39,7 @@ import { useArtifacts } from "../artifacts";
 import { FlipDisplay } from "../flip-display";
 import { Tooltip } from "../tooltip";
 
-import { useThread } from "./context";
-
-import { SafeCitationContent } from "./safe-citation-content";
+import { MarkdownContent } from "./markdown-content";
 
 export function MessageGroup({
   className,
@@ -120,7 +118,7 @@ export function MessageGroup({
                 <ChainOfThoughtStep
                   key={step.id}
                   label={
-                    <SafeCitationContent
+                    <MarkdownContent
                       content={step.reasoning ?? ""}
                       isLoading={isLoading}
                       rehypePlugins={rehypePlugins}
@@ -128,12 +126,7 @@ export function MessageGroup({
                   }
                 ></ChainOfThoughtStep>
               ) : (
-                <ToolCall
-                  key={step.id}
-                  {...step}
-                  isLoading={isLoading}
-                  rehypePlugins={rehypePlugins}
-                />
+                <ToolCall key={step.id} {...step} isLoading={isLoading} />
               ),
             )}
           {lastToolCallStep && (
@@ -143,7 +136,6 @@ export function MessageGroup({
                 {...lastToolCallStep}
                 isLast={true}
                 isLoading={isLoading}
-                rehypePlugins={rehypePlugins}
               />
             </FlipDisplay>
           )}
@@ -178,7 +170,7 @@ export function MessageGroup({
               <ChainOfThoughtStep
                 key={lastReasoningStep.id}
                 label={
-                  <SafeCitationContent
+                  <MarkdownContent
                     content={lastReasoningStep.reasoning ?? ""}
                     isLoading={isLoading}
                     rehypePlugins={rehypePlugins}
@@ -201,7 +193,6 @@ function ToolCall({
   result,
   isLast = false,
   isLoading = false,
-  rehypePlugins,
 }: {
   id?: string;
   messageId?: string;
@@ -210,15 +201,10 @@ function ToolCall({
   result?: string | Record<string, unknown>;
   isLast?: boolean;
   isLoading?: boolean;
-  rehypePlugins: ReturnType<typeof useRehypeSplitWordsIntoSpans>;
 }) {
   const { t } = useI18n();
   const { setOpen, autoOpen, autoSelect, selectedArtifact, select } =
     useArtifacts();
-  const { thread } = useThread();
-  const threadIsLoading = thread.isLoading;
-
-  const fileContent = typeof args.content === "string" ? args.content : "";
 
   if (name === "web_search") {
     let label: React.ReactNode = t.toolCalls.searchForRelatedInfo;
@@ -364,42 +350,27 @@ function ToolCall({
       }, 100);
     }
 
-    const isMarkdown =
-      path?.toLowerCase().endsWith(".md") ||
-      path?.toLowerCase().endsWith(".markdown");
-
     return (
-      <>
-        <ChainOfThoughtStep
-          key={id}
-          className="cursor-pointer"
-          label={description}
-          icon={NotebookPenIcon}
-          onClick={() => {
-            select(
-              new URL(
-                `write-file:${path}?message_id=${messageId}&tool_call_id=${id}`,
-              ).toString(),
-            );
-            setOpen(true);
-          }}
-        >
-          {path && (
-            <ChainOfThoughtSearchResult className="cursor-pointer">
-              {path}
-            </ChainOfThoughtSearchResult>
-          )}
-        </ChainOfThoughtStep>
-        {isMarkdown && (
-          <SafeCitationContent
-            content={fileContent}
-            isLoading={threadIsLoading && isLast}
-            rehypePlugins={rehypePlugins}
-            loadingOnly
-            className="mt-2 ml-8"
-          />
+      <ChainOfThoughtStep
+        key={id}
+        className="cursor-pointer"
+        label={description}
+        icon={NotebookPenIcon}
+        onClick={() => {
+          select(
+            new URL(
+              `write-file:${path}?message_id=${messageId}&tool_call_id=${id}`,
+            ).toString(),
+          );
+          setOpen(true);
+        }}
+      >
+        {path && (
+          <ChainOfThoughtSearchResult className="cursor-pointer">
+            {path}
+          </ChainOfThoughtSearchResult>
         )}
-      </>
+      </ChainOfThoughtStep>
     );
   } else if (name === "bash") {
     const description: string | undefined = (args as { description: string })

frontend/src/components/workspace/messages/message-list-item.tsx

@@ -12,7 +12,6 @@ import {
 } from "@/components/ai-elements/message";
 import { Badge } from "@/components/ui/badge";
 import { resolveArtifactURL } from "@/core/artifacts/utils";
-import { removeAllCitations } from "@/core/citations";
 import {
   extractContentFromMessage,
   extractReasoningContentFromMessage,
@@ -24,7 +23,7 @@ import { humanMessagePlugins } from "@/core/streamdown";
 import { cn } from "@/lib/utils";
 
 import { CopyButton } from "../copy-button";
-import { SafeCitationContent } from "./safe-citation-content";
+import { MarkdownContent } from "./markdown-content";
 
 export function MessageListItem({
   className,
@@ -54,11 +53,11 @@ export function MessageListItem({
       >
         <div className="flex gap-1">
           <CopyButton
-            clipboardData={removeAllCitations(
+            clipboardData={
               extractContentFromMessage(message) ??
               extractReasoningContentFromMessage(message) ??
               ""
-            )}
+            }
           />
         </div>
       </MessageToolbar>
@@ -154,7 +153,7 @@ function MessageContent_({
   return (
     <AIElementMessageContent className={className}>
       {filesList}
-      <SafeCitationContent
+      <MarkdownContent
         content={contentToParse}
         isLoading={isLoading}
         rehypePlugins={[...rehypePlugins, [rehypeKatex, { output: "html" }]]}

frontend/src/components/workspace/messages/message-list.tsx

@@ -26,7 +26,7 @@ import { StreamingIndicator } from "../streaming-indicator";
 
 import { MessageGroup } from "./message-group";
 import { MessageListItem } from "./message-list-item";
-import { SafeCitationContent } from "./safe-citation-content";
+import { MarkdownContent } from "./markdown-content";
 import { MessageListSkeleton } from "./skeleton";
 import { SubtaskCard } from "./subtask-card";
 
@@ -69,7 +69,7 @@ export function MessageList({
             const message = group.messages[0];
             if (message && hasContent(message)) {
               return (
-                <SafeCitationContent
+                <MarkdownContent
                   key={group.id}
                   content={extractContentFromMessage(message)}
                   isLoading={thread.isLoading}
@@ -89,7 +89,7 @@ export function MessageList({
             return (
               <div className="w-full" key={group.id}>
                 {group.messages[0] && hasContent(group.messages[0]) && (
-                  <SafeCitationContent
+                  <MarkdownContent
                     content={extractContentFromMessage(group.messages[0])}
                     isLoading={thread.isLoading}
                     rehypePlugins={rehypePlugins}

frontend/src/components/workspace/messages/safe-citation-content.tsx

@@ -1,85 +0,0 @@
-"use client";
-
-import type { ImgHTMLAttributes } from "react";
-import type { ReactNode } from "react";
-import { useMemo } from "react";
-
-import {
-  CitationsLoadingIndicator,
-  createCitationMarkdownComponents,
-} from "@/components/ai-elements/inline-citation";
-import {
-  MessageResponse,
-  type MessageResponseProps,
-} from "@/components/ai-elements/message";
-import {
-  shouldShowCitationLoading,
-  useParsedCitations,
-  type UseParsedCitationsResult,
-} from "@/core/citations";
-import { streamdownPlugins } from "@/core/streamdown";
-import { cn } from "@/lib/utils";
-
-export type SafeCitationContentProps = {
-  content: string;
-  isLoading: boolean;
-  rehypePlugins: MessageResponseProps["rehypePlugins"];
-  className?: string;
-  remarkPlugins?: MessageResponseProps["remarkPlugins"];
-  isHuman?: boolean;
-  img?: (props: ImgHTMLAttributes<HTMLImageElement> & { threadId?: string; maxWidth?: string }) => ReactNode;
-  /** When true, only show loading indicator or null (e.g. write_file step). */
-  loadingOnly?: boolean;
-  /** When set, use instead of default MessageResponse (e.g. artifact preview). */
-  renderBody?: (parsed: UseParsedCitationsResult) => ReactNode;
-};
-
-/** Single place for citation-aware body: shows loading until citations complete (no half-finished refs), else body. */
-export function SafeCitationContent({
-  content,
-  isLoading,
-  rehypePlugins,
-  className,
-  remarkPlugins = streamdownPlugins.remarkPlugins,
-  isHuman = false,
-  img,
-  loadingOnly = false,
-  renderBody,
-}: SafeCitationContentProps) {
-  const parsed = useParsedCitations(content);
-  const { citations, cleanContent, citationMap } = parsed;
-  const showLoading = shouldShowCitationLoading(content, cleanContent, isLoading);
-  const components = useMemo(
-    () =>
-      createCitationMarkdownComponents({
-        citationMap,
-        isHuman,
-        isLoadingCitations: false,
-        img,
-      }),
-    [citationMap, isHuman, img],
-  );
-
-  if (showLoading) {
-    return (
-      <CitationsLoadingIndicator
-        citations={citations}
-        className={cn("my-2", className)}
-      />
-    );
-  }
-  if (loadingOnly) return null;
-  if (renderBody) return renderBody(parsed);
-  if (!cleanContent) return null;
-
-  return (
-    <MessageResponse
-      className={className}
-      remarkPlugins={remarkPlugins}
-      rehypePlugins={rehypePlugins}
-      components={components}
-    >
-      {cleanContent}
-    </MessageResponse>
-  );
-}

frontend/src/components/workspace/messages/subtask-card.tsx

@@ -29,7 +29,7 @@ import { cn } from "@/lib/utils";
 
 import { FlipDisplay } from "../flip-display";
 
-import { SafeCitationContent } from "./safe-citation-content";
+import { MarkdownContent } from "./markdown-content";
 
 export function SubtaskCard({
   className,
@@ -153,7 +153,7 @@ export function SubtaskCard({
               <ChainOfThoughtStep
                 label={
                   task.result ? (
-                    <SafeCitationContent
+                    <MarkdownContent
                       content={task.result}
                       isLoading={false}
                       rehypePlugins={rehypePlugins}