test(vscode-ide-companion): 尝试通过 session/load 旧会话

- 修改了 WebViewProvider 中的逻辑，先尝试通过 ACP 加载旧会话
- 如果加载失败，则创建新会话作为回退方案
- 在 AcpConnection 中添加了初始化响应的日志输出
- 在 QwenAgentManager 中添加了新的 loadSessionViaAcp 方法，用于测试 ACP 的 session/load 功能

packages/vscode-ide-companion/src/WebViewProvider.ts

@@ -754,11 +754,29 @@ export class WebViewProvider {
         console.log('[WebViewProvider] Could not get session details:', err);
       }
 
-      // IMPORTANT: CLI doesn't support loading old sessions
+      // TESTING: Try to load session via ACP first, fallback to creating new session
-      // So we always create a NEW ACP session for continuation
       const workspaceFolder = vscode.workspace.workspaceFolders?.[0];
       const workingDir = workspaceFolder?.uri.fsPath || process.cwd();
 
+      try {
+        console.log('[WebViewProvider] Testing session/load via ACP...');
+        const loadResponse =
+          await this.agentManager.loadSessionViaAcp(sessionId);
+        console.log('[WebViewProvider] session/load succeeded:', loadResponse);
+
+        // If load succeeded, use the loaded session
+        this.currentConversationId = sessionId;
+        console.log(
+          '[WebViewProvider] Set currentConversationId to loaded session:',
+          sessionId,
+        );
+      } catch (_loadError) {
+        console.log(
+          '[WebViewProvider] session/load not supported, creating new session',
+        );
+
+        // Fallback: CLI doesn't support loading old sessions
+        // So we create a NEW ACP session for continuation
         try {
           const newAcpSessionId =
             await this.agentManager.createNewSession(workingDir);
@@ -783,6 +801,7 @@ export class WebViewProvider {
           );
           throw createError;
         }
+      }
 
       // Send messages and session details to WebView
       // The historical messages are display-only, not sent to CLI

packages/vscode-ide-companion/src/acp/acpConnection.ts

@@ -193,11 +193,13 @@ export class AcpConnection {
     });
 
     // 初始化协议
-    await this.sessionManager.initialize(
+    const res = await this.sessionManager.initialize(
       this.child,
       this.pendingRequests,
       this.nextRequestId,
     );
+
+    console.log('[ACP] Initialization response:', res);
   }
 
   /**

packages/vscode-ide-companion/src/agents/qwenAgentManager.ts

@@ -127,7 +127,7 @@ export class QwenAgentManager {
   }
 
   /**
-   * 获取会话消息
+   * 获取会话消息（从磁盘读取）
    *
    * @param sessionId - 会话ID
    * @returns 消息列表
@@ -159,6 +159,28 @@ export class QwenAgentManager {
     }
   }
 
+  /**
+   * 尝试通过 ACP session/load 方法加载会话
+   * 这是一个测试方法，用于验证 CLI 是否支持 session/load
+   *
+   * @param sessionId - 会话ID
+   * @returns 加载响应或错误
+   */
+  async loadSessionViaAcp(sessionId: string): Promise<unknown> {
+    try {
+      console.log(
+        '[QwenAgentManager] Testing session/load via ACP for:',
+        sessionId,
+      );
+      const response = await this.connection.loadSession(sessionId);
+      console.log('[QwenAgentManager] Session load response:', response);
+      return response;
+    } catch (error) {
+      console.error('[QwenAgentManager] Session load via ACP failed:', error);
+      throw error;
+    }
+  }
+
   /**
    * 创建新会话
    *