fix(llm): classify zai token limit overflow (#35671)

packages/llm/test/provider-error.test.ts

@@ -0,0 +1,8 @@
+import { describe, expect, test } from "bun:test"
+import { isContextOverflow } from "../src"
+
+describe("provider error classification", () => {
+  test("classifies Z.AI GLM token limit messages as context overflow", () => {
+    expect(isContextOverflow("tokens in request more than max tokens allowed")).toBe(true)
+  })
+})