feat: v4.1 会话增强 — /retry /undo /compress + 工具并行执行

新增功能：
- /retry：重试上一轮对话，删除最后的 AI 回复并重新触发 Agent Loop
- /undo：撤销最后的用户+AI 消息对
- /compress：用 LLM 摘要压缩中间对话，保留首尾上下文
- 工具并行执行：同一批次内互相独立的工具用 Promise.all 并行执行

技术细节：
- input-area.ts: 命令检测在 sendMessage() 入口处，/retry 支持普通聊天和 Agent Loop 两种模式
- chat-area.ts: 新增 clearMessagesDOM() 用于 undo/compress 后强制重建 DOM
- agent-engine.ts: 工具调用分批算法 — 根据 TOOLS_WITH_DATA_DEPS 集合检测依赖关系，
  独立工具同批并行，有依赖的工具跨批串行

src/renderer/components/chat-area.ts

@@ -368,6 +368,11 @@ export function appendSystemMessage(text: string, tempClass?: string): void {
   scrollToBottom();
 }
 
+/** v4.1: 清除所有消息 DOM 元素（用于 undo/compress 后强制重建） */
+export function clearMessagesDOM(): void {
+  messagesContainerEl.innerHTML = '';
+}
+
 export function clearMessages(): void {
   messagesContainerEl.innerHTML = '';
   currentPlaceholder = null;

src/renderer/components/input-area.ts

@@ -6,7 +6,7 @@ import { state, KEYS } from '../state/state.js';
 import { detectLanguage, truncate, escapeHtml, formatSize } from '../utils/utils.js';
 import { getSelectedModel, isThinkEnabled, isVisionAvailable, isToolCallingSupported } from './model-bar.js';
 import {
-  renderMessages, appendAssistantPlaceholder, appendSystemMessage,
+  renderMessages, clearMessagesDOM, appendAssistantPlaceholder, appendSystemMessage,
   updateLastAssistantMessage, clearMessages, safeMarkdown, enableAutoScroll, updateTotalTokens
 } from './chat-area.js';
 import { showToast } from './toast.js';
@@ -222,6 +222,226 @@ function renderFilePreviews(): void {
   `).join('');
 }
 
+// ══════════════════════════════════════════════
+// v4.1 会话管理命令：/retry, /undo, /compress
+// ══════════════════════════════════════════════
+
+async function handleRetry(): Promise<void> {
+  const currentSession = state.get<ChatSession | null>(KEYS.CURRENT_SESSION);
+  if (!currentSession || currentSession.messages.length < 2) {
+    showToast('没有可重试的消息', 'warning');
+    return;
+  }
+  if (state.get<boolean>(KEYS.IS_STREAMING)) {
+    showToast('请先停止当前生成', 'warning');
+    return;
+  }
+
+  // 找到最后一条 user 消息
+  let lastUserIdx = -1;
+  for (let i = currentSession.messages.length - 1; i >= 0; i--) {
+    if (currentSession.messages[i].role === 'user') { lastUserIdx = i; break; }
+  }
+  if (lastUserIdx < 0) { showToast('没有找到用户消息', 'warning'); return; }
+
+  // 删除该 user 消息之后的所有消息（assistant 回复 + 可能的 tool 调用链）
+  const removedCount = currentSession.messages.length - lastUserIdx - 1;
+  const userMsg = currentSession.messages[lastUserIdx];
+  currentSession.messages = currentSession.messages.slice(0, lastUserIdx + 1);
+
+  logInfo(`重试: 删除了 ${removedCount} 条消息，重新发送`);
+
+  const db = state.get<ChatDB | null>(KEYS.DB);
+  if (db) await db.saveSession(currentSession);
+
+  clearMessagesDOM();
+  renderMessages();
+
+  // 重新触发 Agent Loop / 普通聊天
+  const toolCallingEnabled = state.get<boolean>('toolCallingEnabled', false);
+  const model = getSelectedModel() || currentSession.model;
+
+  appendAssistantPlaceholder();
+  state.set(KEYS.IS_STREAMING, true);
+  updateSendButton(true);
+
+  if (toolCallingEnabled) {
+    const historyMessages = currentSession.messages
+      .filter(m => m.role === 'user' || m.role === 'assistant')
+      .slice(0, -1) // 不包含刚保留的最后一条 user 消息
+      .slice(-20)
+      .map(m => {
+        let content = m.content || '';
+        if (m._fileContents?.length) {
+          const fileParts = m._fileContents.map(f => `📄 文件：\n\`\`\`${f.language}\n${f.content}\n\`\`\``);
+          content = content ? content + '\n\n---\n' + fileParts.join('\n\n---\n') : fileParts.join('\n\n---\n');
+        }
+        return { role: m.role, content, ...(m.images?.length && { images: m.images }) };
+      });
+
+    try {
+      await runAgentLoop(userMsg.content || '', userMsg.images || [], historyMessages, {
+        onThinking: (thinking) => updateLastAssistantMessage('', thinking, null),
+        onContent: (content) => updateLastAssistantMessage(content, null, null),
+        onToolCallStart: () => {},
+        onToolCallResult: () => {},
+        onToolCallError: () => {},
+        onConfirmTool: async (call) => showToolConfirm(call),
+        onDone: async (finalContent, toolRecords, loopStats) => {
+          const assistantMsg: ChatMessage = {
+            role: 'assistant', content: finalContent || '', timestamp: Date.now(),
+            ...(toolRecords?.length && { toolCalls: toolRecords }),
+            ...(loopStats?.eval_count && { eval_count: loopStats.eval_count }),
+            ...(loopStats?.total_duration && { total_duration: loopStats.total_duration }),
+          };
+          state.update(KEYS.CURRENT_SESSION, (s: any) => ({
+            ...s, messages: [...s.messages, assistantMsg], updatedAt: Date.now()
+          }));
+          updateLastAssistantMessage(finalContent, null, loopStats || null);
+          renderMessages();
+          await saveCurrentSession();
+          updateTotalTokens();
+        }
+      });
+    } catch (err) {
+      logError('重试失败', (err as Error).message);
+      appendSystemMessage(`❌ 重试失败: ${(err as Error).message}`);
+    }
+  } else {
+    // 普通聊天模式重试 - 直接调用 sendMessage
+    chatInputEl.value = userMsg.content || '';
+    state.set(KEYS.IS_STREAMING, false);
+    updateSendButton(false);
+    await sendMessage();
+    return;
+  }
+
+  state.set(KEYS.IS_STREAMING, false);
+  updateSendButton(false);
+}
+
+async function handleUndo(): Promise<void> {
+  const currentSession = state.get<ChatSession | null>(KEYS.CURRENT_SESSION);
+  if (!currentSession || currentSession.messages.length < 2) {
+    showToast('没有可撤销的消息', 'warning');
+    return;
+  }
+  if (state.get<boolean>(KEYS.IS_STREAMING)) {
+    showToast('请先停止当前生成', 'warning');
+    return;
+  }
+
+  // 从末尾删除：先删 assistant（含可能的 tool 消息），再删 user
+  const msgs = currentSession.messages;
+  let removeEnd = msgs.length;
+  let removeStart = msgs.length - 1;
+
+  // 找到最后一条 user 消息的位置
+  while (removeStart >= 0 && msgs[removeStart].role !== 'user') {
+    removeStart--;
+  }
+  if (removeStart < 0) { showToast('没有找到用户消息', 'warning'); return; }
+
+  // 删除 user 消息及之后的所有消息
+  const removedCount = removeEnd - removeStart;
+  currentSession.messages = msgs.slice(0, removeStart);
+
+  logInfo(`撤销: 删除了 ${removedCount} 条消息`);
+
+  const db = state.get<ChatDB | null>(KEYS.DB);
+  if (db) await db.saveSession(currentSession);
+
+  clearMessagesDOM();
+  renderMessages();
+  updateTotalTokens();
+  showToast('已撤销上一轮对话', 'success');
+}
+
+async function handleCompress(): Promise<void> {
+  const currentSession = state.get<ChatSession | null>(KEYS.CURRENT_SESSION);
+  if (!currentSession || currentSession.messages.length < 6) {
+    showToast('消息太少，无需压缩', 'warning');
+    return;
+  }
+  if (state.get<boolean>(KEYS.IS_STREAMING)) {
+    showToast('请先停止当前生成', 'warning');
+    return;
+  }
+
+  const api = state.get<OllamaAPI>(KEYS.API);
+  const model = getSelectedModel() || currentSession.model;
+  if (!api || !model) {
+    showToast('请先选择模型', 'warning');
+    return;
+  }
+
+  logInfo('上下文压缩: 开始');
+
+  // 取中间的消息做摘要（保留首尾各 2 条）
+  const messages = currentSession.messages;
+  const keepStart = 2;
+  const keepEnd = 2;
+  const head = messages.slice(0, keepStart);
+  const tail = messages.slice(-keepEnd);
+  const middle = messages.slice(keepStart, messages.length - keepEnd);
+
+  const conversationText = middle.map(m => {
+    const role = m.role === 'user' ? '用户' : 'AI';
+    let content = m.content || '';
+    // 截断过长内容
+    if (content.length > 500) content = content.slice(0, 500) + '...';
+    if (m.toolCalls?.length) content += ` [工具调用: ${m.toolCalls.map(t => t.name).join(', ')}]`;
+    return `${role}: ${content}`;
+  }).join('\n');
+
+  showToast('正在压缩上下文...', 'info');
+
+  try {
+    let summary = '';
+    await api.chatStream({
+      model,
+      messages: [{
+        role: 'user',
+        content: `请将以下对话摘要为一段简洁的上下文总结。保留关键信息：讨论的主题、得出的结论、用户的偏好、未完成的任务。用中文输出，不超过 500 字。\n\n对话记录：\n${conversationText}`
+      }],
+      stream: true,
+      think: false,
+      options: { num_ctx: 8192, temperature: 0.3 }
+    } as any, (chunk: OllamaStreamChunk) => {
+      if (chunk.message?.content) {
+        summary += chunk.message.content;
+      }
+    });
+
+    if (!summary.trim()) {
+      showToast('压缩失败：模型未返回内容', 'error');
+      return;
+    }
+
+    // 构建压缩后的消息列表
+    const summaryMsg: ChatMessage = {
+      role: 'system',
+      content: `📋 以下是对之前对话的摘要（已压缩 ${middle.length} 条消息）：\n\n${summary}`,
+      timestamp: Date.now()
+    };
+
+    currentSession.messages = [...head, summaryMsg, ...tail];
+
+    const db = state.get<ChatDB | null>(KEYS.DB);
+    if (db) await db.saveSession(currentSession);
+
+    clearMessagesDOM();
+    renderMessages();
+    updateTotalTokens();
+
+    logInfo(`上下文压缩完成: ${middle.length} 条 → 1 条摘要`);
+    showToast(`已压缩 ${middle.length} 条消息为摘要`, 'success');
+  } catch (err) {
+    logError('上下文压缩失败', (err as Error).message);
+    showToast(`压缩失败: ${(err as Error).message}`, 'error');
+  }
+}
+
 function updateSendButton(streaming: boolean): void {
   if (streaming) {
     btnSendEl.innerHTML = `<svg viewBox="0 0 24 24" fill="currentColor"><rect x="6" y="6" width="12" height="12" rx="2"/></svg>`;
@@ -266,6 +486,24 @@ function buildApiMessages(messages: ChatMessage[]): Array<{ role: string; conten
 
 export async function sendMessage(): Promise<void> {
   const text = chatInputEl.value.trim();
+
+  // ── v4.1 会话管理命令 ──
+  if (text === '/retry') {
+    chatInputEl.value = '';
+    await handleRetry();
+    return;
+  }
+  if (text === '/undo') {
+    chatInputEl.value = '';
+    await handleUndo();
+    return;
+  }
+  if (text === '/compress') {
+    chatInputEl.value = '';
+    await handleCompress();
+    return;
+  }
+
   if (!text && pendingImages.length === 0 && pendingFiles.length === 0) return;
   if (state.get<boolean>(KEYS.IS_STREAMING)) return;
 

src/renderer/services/agent-engine.ts

@@ -31,6 +31,9 @@ const TOOL_EXEC_TIMEOUT = 30000;    // 工具执行超时 30 秒
 const STREAM_TIMEOUT = 120000;      // 单次流式调用超时 2 分钟
 const MAX_RETRIES = 2;              // 工具错误自动重试次数
 
+/** v4.1: 工具并行执行 — 依赖检测用 */
+const TOOLS_WITH_DATA_DEPS = new Set(['web_fetch', 'edit_file', 'append_file', 'move_file', 'delete_file']);
+
 const AGENT_SYSTEM_PROMPT = `你是一个具备工具调用能力的 AI 助手。你有 25 个工具可以调用，包括文件操作、联网搜索、网页抓取、命令执行、记忆管理等。
 
 ## 核心规则
@@ -562,61 +565,80 @@ export async function runAgentLoop(
       createdAt: Date.now()
     };
 
+    // ── v4.1 工具并行执行：将独立工具分批并行调用 ──
+    // 将工具调用分成批次：同一批次内的工具互相独立，可并行执行
+    // 跨批次的工具有依赖关系（如 web_fetch 依赖前面的 web_search）
+    const batches: ToolCall[][] = [];
+    let currentBatch: ToolCall[] = [];
+    const batchDeps = new Map<ToolCall, string>(); // 记录每个工具依赖的前序工具名
+
     for (const call of toolCalls) {
-      // 检查是否已中止
-      if (abortController.signal.aborted) {
-        callbacks.onDone(content, allToolRecords.length > 0 ? allToolRecords : undefined, makeStats());
-        return;
+      if (currentBatch.length === 0) {
+        currentBatch.push(call);
+      } else {
+        // 检查当前工具是否依赖当前批次中任何工具的结果
+        const needsPrevResult = currentBatch.some(prev =>
+          TOOLS_WITH_DATA_DEPS.has(call.function.name) && prev.function.name !== call.function.name
+        );
+        if (needsPrevResult) {
+          // 有依赖，当前批次结束，开启新批次
+          batches.push(currentBatch);
+          batchDeps.set(call, currentBatch[currentBatch.length - 1].function.name);
+          currentBatch = [call];
+        } else {
+          currentBatch.push(call);
+        }
+      }
+    }
+    if (currentBatch.length > 0) batches.push(currentBatch);
+
+    if (batches.length > 1) {
+      logInfo(`工具并行执行: ${toolCalls.length} 个工具 → ${batches.length} 批次（首批 ${batches[0].length} 个并行）`);
     }
 
-      // 同一轮内重复调用检测
+    /** 执行单个工具（含重试），返回 [ToolCallRecord, 缓存key|null] */
+    const executeSingleTool = async (call: ToolCall): Promise<[ToolCallRecord, string | null]> => {
+      const cacheKey = getToolCacheKey(call.function.name, call.function.arguments);
+
+      // 重复调用检测
       if (isDuplicateCall(call, toolCalls)) {
         logWarn(`跳过重复工具调用: ${call.function.name}`);
-        const cachedKey = getToolCacheKey(call.function.name, call.function.arguments);
-        const cached = toolResultCache.get(cachedKey);
+        const cached = toolResultCache.get(cacheKey);
         if (cached) {
-          messages.push({ role: 'tool', tool_name: call.function.name, content: formatToolResultForModel(call.function.name, cached) });
-          callbacks.onToolCallResult(call.function.name, cached, call);
+          return [{
+            name: call.function.name, arguments: call.function.arguments,
+            result: cached, status: 'success' as const, timestamp: Date.now()
+          }, null];
         }
-        continue;
       }
 
       // 跨轮次缓存命中
-      const cacheKey = getToolCacheKey(call.function.name, call.function.arguments);
       const cachedResult = toolResultCache.get(cacheKey);
       if (cachedResult) {
         logInfo(`工具缓存命中: ${call.function.name}`);
-        messages.push({ role: 'tool', tool_name: call.function.name, content: formatToolResultForModel(call.function.name, cachedResult) });
-        callbacks.onToolCallResult(call.function.name, cachedResult, call);
-        continue;
+        return [{
+          name: call.function.name, arguments: call.function.arguments,
+          result: cachedResult, status: 'success' as const, timestamp: Date.now()
+        }, null];
       }
 
       callbacks.onToolCallStart(call);
       logToolStart(call.function.name, JSON.stringify(call.function.arguments));
 
+      // 需要确认的工具（目前只有 run_command 在 confirm 模式下）
       if (needsConfirmation(call.function.name)) {
         const confirmed = await callbacks.onConfirmTool(call);
-        if (abortController.signal.aborted) {
-          callbacks.onDone(content, allToolRecords.length > 0 ? allToolRecords : undefined, makeStats());
-          return;
-        }
         if (!confirmed) {
           logWarn(`工具取消: ${call.function.name}`);
-          const record: ToolCallRecord = {
-            name: call.function.name,
-            arguments: call.function.arguments,
-            result: { success: false, error: '用户取消了操作' },
-            status: 'cancelled',
-            timestamp: Date.now()
-          };
-          allToolRecords.push(record);
-          messages.push({ role: 'tool', tool_name: call.function.name, content: JSON.stringify({ success: false, error: '用户取消了操作' }) });
-          callbacks.onToolCallError(call.function.name, '用户取消', call);
-          continue;
+          const cancelResult = { success: false, error: '用户取消了操作' };
+          return [{
+            name: call.function.name, arguments: call.function.arguments,
+            result: cancelResult, status: 'cancelled' as const, timestamp: Date.now()
+          }, null];
         }
       }
 
-      // 工具执行 + 自动重试
+      // 执行 + 自动重试
       let lastError = '';
       for (let retry = 0; retry <= MAX_RETRIES; retry++) {
         try {
@@ -633,42 +655,55 @@ export async function runAgentLoop(
               )
             ]);
           }
-
-          // 成功
-          const record: ToolCallRecord = {
-            name: call.function.name,
-            arguments: call.function.arguments,
-            result,
-            status: result.success ? 'success' : 'error',
-            timestamp: Date.now()
-          };
-          allToolRecords.push(record);
-          messages.push({ role: 'tool', tool_name: call.function.name, content: formatToolResultForModel(call.function.name, result) });
-          if (result.success && call.function.name !== 'run_command') {
-            toolResultCache.set(cacheKey, result);
-          }
-          callbacks.onToolCallResult(call.function.name, result, call);
           logToolResult(call.function.name, result.success, result.success ? undefined : result.error);
-          break; // 成功，退出重试循环
+          return [{
+            name: call.function.name, arguments: call.function.arguments,
+            result, status: result.success ? 'success' as const : 'error' as const, timestamp: Date.now()
+          }, result.success && call.function.name !== 'run_command' ? cacheKey : null];
         } catch (err) {
           lastError = (err as Error).message;
           if (retry < MAX_RETRIES) {
             logWarn(`工具重试 ${retry + 1}/${MAX_RETRIES}: ${call.function.name}`, lastError);
-            await new Promise(r => setTimeout(r, 500)); // 短暂延迟后重试
+            await new Promise(r => setTimeout(r, 500));
             continue;
           }
-          // 最终失败
           logError(`工具执行失败: ${call.function.name}`, lastError);
-          const record: ToolCallRecord = {
-            name: call.function.name,
-            arguments: call.function.arguments,
+          return [{
+            name: call.function.name, arguments: call.function.arguments,
             result: { success: false, error: lastError },
-            status: 'error',
-            timestamp: Date.now()
+            status: 'error' as const, timestamp: Date.now()
+          }, null];
+        }
+      }
+      // unreachable
+      return [{
+        name: call.function.name, arguments: call.function.arguments,
+        result: { success: false, error: lastError }, status: 'error' as const, timestamp: Date.now()
+      }, null];
     };
+
+    // 按批次执行：批次内并行，批次间串行
+    for (const batch of batches) {
+      if (abortController.signal.aborted) {
+        callbacks.onDone(content, allToolRecords.length > 0 ? allToolRecords : undefined, makeStats());
+        return;
+      }
+
+      const results = await Promise.all(batch.map(call => executeSingleTool(call)));
+
+      for (const [record, cacheKey] of results) {
         allToolRecords.push(record);
-          messages.push({ role: 'tool', tool_name: call.function.name, content: JSON.stringify({ success: false, error: lastError }) });
-          callbacks.onToolCallError(call.function.name, lastError, call);
+        messages.push({
+          role: 'tool', tool_name: record.name,
+          content: formatToolResultForModel(record.name, record.result!)
+        });
+        if (cacheKey) toolResultCache.set(cacheKey, record.result!);
+        if (record.status === 'success') {
+          callbacks.onToolCallResult(record.name, record.result!, batch.find(c => c.function.name === record.name)!);
+        } else if (record.status === 'cancelled') {
+          callbacks.onToolCallError(record.name, '用户取消', batch.find(c => c.function.name === record.name)!);
+        } else {
+          callbacks.onToolCallError(record.name, record.result?.error || '执行失败', batch.find(c => c.function.name === record.name)!);
         }
       }
     }