fix: clamp z.ai developer role

src/agents/model-compat.test.ts

@@ -0,0 +1,44 @@
+import type { Api, Model } from "@mariozechner/pi-ai";
+import { describe, expect, it } from "vitest";
+import { normalizeModelCompat } from "./model-compat.js";
+
+const baseModel = (): Model<Api> =>
+  ({
+    id: "glm-4.7",
+    name: "GLM-4.7",
+    api: "openai-completions",
+    provider: "zai",
+    baseUrl: "https://api.z.ai/api/coding/paas/v4",
+    reasoning: true,
+    input: ["text"],
+    cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+    contextWindow: 8192,
+    maxTokens: 1024,
+  }) as Model<Api>;
+
+describe("normalizeModelCompat", () => {
+  it("forces supportsDeveloperRole off for z.ai models", () => {
+    const model = baseModel();
+    delete (model as { compat?: unknown }).compat;
+    const normalized = normalizeModelCompat(model);
+    expect(normalized.compat?.supportsDeveloperRole).toBe(false);
+  });
+
+  it("leaves non-zai models untouched", () => {
+    const model = {
+      ...baseModel(),
+      provider: "openai",
+      baseUrl: "https://api.openai.com/v1",
+    };
+    delete (model as { compat?: unknown }).compat;
+    const normalized = normalizeModelCompat(model);
+    expect(normalized.compat).toBeUndefined();
+  });
+
+  it("does not override explicit z.ai compat false", () => {
+    const model = baseModel();
+    model.compat = { supportsDeveloperRole: false };
+    const normalized = normalizeModelCompat(model);
+    expect(normalized.compat?.supportsDeveloperRole).toBe(false);
+  });
+});