fix: clamp z.ai developer role

src/agents/model-compat.ts

@@ -0,0 +1,13 @@
+import type { Api, Model } from "@mariozechner/pi-ai";
+
+export function normalizeModelCompat(model: Model<Api>): Model<Api> {
+  const baseUrl = model.baseUrl ?? "";
+  const isZai = model.provider === "zai" || baseUrl.includes("api.z.ai");
+  if (!isZai) return model;
+
+  const compat = model.compat ?? {};
+  if (compat.supportsDeveloperRole === false) return model;
+
+  model.compat = { ...compat, supportsDeveloperRole: false };
+  return model;
+}