make top_p configurable

packages/opencode/src/provider/transform.ts

@@ -50,4 +50,9 @@ export namespace ProviderTransform {
     if (modelID.toLowerCase().includes("qwen")) return 0.55
     return 0
   }
+
+  export function topP(_providerID: string, modelID: string) {
+    if (modelID.toLowerCase().includes("qwen")) return 1
+    return undefined
+  }
 }