fix: 明确告知 agent SearchExtraTools/ExecuteExtraTool 是核心工具，已在工具列表中

- prompts.ts: 核心工具列表显式加入 SearchExtraTools, ExecuteExtraTool
- claude.ts: 非 delta 路径提示强调这两个工具可直接调用
- messages.ts: delta 路径渲染强调这两个工具已在工具列表中
- SearchExtraToolsTool/prompt.ts: 加入完整两步工作流示例
- ExecuteTool/prompt.ts: 加入完整两步工作流示例

src/services/api/claude.ts

@@ -1396,7 +1396,7 @@ async function* queryModel(
       messagesForAPI = [
         ...messagesForAPI,
         createUserMessage({
-          content: `<system-reminder>\n<available-deferred-tools>\n${deferredToolList}\n</available-deferred-tools>\nIMPORTANT: These tools are deferred-loading. You MUST first discover a tool via SearchExtraTools before invoking it with ExecuteExtraTool. Do NOT call ExecuteExtraTool directly — it will fail if the tool has not been discovered.\n\nSteps:\n1. SearchExtraTools("select:<tool_name>") — discover the tool and its schema\n2. ExecuteExtraTool({"tool_name": "<name>", "params": {...}}) — invoke it with correct parameters\n</system-reminder>`,
+          content: `<system-reminder>\n<available-deferred-tools>\n${deferredToolList}\n</available-deferred-tools>\nIMPORTANT: The tools listed above are deferred-loading — they are NOT in your tool list. To use them, you MUST first discover a tool via SearchExtraTools, then invoke it with ExecuteExtraTool.\n\nSearchExtraTools and ExecuteExtraTool are core tools already in your tool list right now — call them directly, do NOT use Bash/Glob to find them.\n\nSteps:\n1. SearchExtraTools({"query": "select:<tool_name>"}) — discover the tool and its schema\n2. ExecuteExtraTool({"tool_name": "<name>", "params": {...}}) — invoke it with correct parameters\n</system-reminder>`,
           isMeta: true,
         }),
       ]