fix(searcher): disable parallel tool calls and remove stale card_id from search-result props

- Add parallel_tool_calls: false to searcher agentNode bindTools call so the
  LLM is forced to execute search tools one at a time (google_search first,
  then web_read in a separate turn); prompt-level "strict禁止" alone cannot
  override model-side parallel tool calling behaviour
- Remove card_id field from google_search and web_search_deep ui.push props;
  SearchResultProps does not declare card_id so the field caused TS2769
  overload errors; these cards do not need deduplication (each search is a
  distinct query), while the card_id variables were introduced by a previous
  commit and are now unused
- Clean up unused googleCardId and deepCardId local variables

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

langgraph/src/agent/searcher/nodes/agent.ts

@@ -97,6 +97,8 @@ export async function agentNode(
     ...truncated,
   ];
 
-  const message = await llm.bindTools([...SEARCHER_TOOLS]).invoke(messagesWithSystem);
+  const message = await llm
+    .bindTools([...SEARCHER_TOOLS], { parallel_tool_calls: false })
+    .invoke(messagesWithSystem);
   return { messages: [message], timestamp: Date.now() };
 }

langgraph/src/agent/searcher/nodes/tool-executor.ts

@@ -59,7 +59,6 @@ export async function toolExecutorNode(
       switch (name) {
         case "google_search": {
           const parsed = googleSearchSchema.parse(args);
-          const googleCardId = `google-search-${tc.id}`;
           let results: Array<{ title: string; url: string; snippet: string }>;
           let knowledgeGraph: { title: string; description: string } | undefined;
           let fallbackUsed = false;
@@ -104,7 +103,6 @@ export async function toolExecutorNode(
             {
               name: "search-result",
               props: {
-                card_id: googleCardId,
                 query: parsed.query,
                 total: results.length,
                 results,
@@ -141,7 +139,6 @@ export async function toolExecutorNode(
 
         case "web_search_deep": {
           const parsed = webSearchDeepSchema.parse(args);
-          const deepCardId = `web-search-deep-${tc.id}`;
           let enriched: Array<{ title: string; url: string; snippet: string }>;
           let fallbackUsed = false;
           let readerAllFailed = false;
@@ -205,7 +202,6 @@ export async function toolExecutorNode(
             {
               name: "search-result",
               props: {
-                card_id: deepCardId,
                 query: parsed.query,
                 total: enriched.length,
                 results: enriched,