fix: disable system message tools for kimi k2

Author: uinstinct

core/config/shouldAutoEnableSystemMessageTools.ts

@@ -21,9 +21,12 @@ import { ModelDescription } from "../index.d";
 export function shouldAutoEnableSystemMessageTools(
   model: ModelDescription,
 ): boolean | undefined {
-  // Auto-enable for OpenRouter, but exclude Claude models which have good native tool calling
+  // Auto-enable for OpenRouter, but exclude Claude/KimiK2 models which have good native tool calling
   if (model.provider === "openrouter") {
-    return !model.model.toLowerCase().includes("claude");
+    return (
+      !model.model.toLowerCase().includes("claude") &&
+      !model.model.toLowerCase().includes("kimi-k2")
+    );
   }
 
   // No auto-preference for all other providers - use manual setting