fix: add Jina X-Timeout header + ensure webRead always throws Error instances

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

langgraph/src/agent/enterprise/tools/soc-client.ts

@@ -143,6 +143,7 @@ export async function webSearch(query: string): Promise<{
     Authorization: `Bearer ${config.jina.apiKey}`,
     "Content-Type": "application/json",
     Accept: "application/json",
+    "X-Timeout": "15",
   };
 
   // Step 1: Search
@@ -231,16 +232,24 @@ export async function googleSearch(query: string): Promise<{
 
 // --- Jina Web Read (single URL full-text) ---
 export async function webRead(url: string): Promise<{ content: string; title: string }> {
+  try {
     const resp = await fetch(`https://r.jina.ai/${url}`, {
       headers: {
         Authorization: `Bearer ${config.jina.apiKey}`,
         Accept: "application/json",
+        "X-Timeout": "15",
+        "X-Return-Format": "markdown",
       },
       signal: AbortSignal.timeout(getToolConfig("web_read").timeoutMs),
     });
     if (!resp.ok) throw new Error(`Jina read failed: ${resp.status}`);
     const data = await resp.json();
     return { content: data.data?.content ?? "", title: data.data?.title ?? "" };
+  } catch (e) {
+    // 确保抛出的是 Error 实例，不是其他类型
+    if (e instanceof Error) throw e;
+    throw new Error(String(e));
+  }
 }
 
 // --- Jina Rerank ---