fix(models): antigravity opus 4.6 availability follow-up (#12845)

* fix(models): antigravity opus 4.6 availability follow-up

* chore(format): apply updated oxfmt config to models files

* fix(models): retain zai glm-5 forward-compat fallback after extraction

* chore(format): apply updated oxfmt config

* fix(models): fail fast on unknown auth login provider

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/commands/models.auth.provider-resolution.test.ts

@@ -0,0 +1,48 @@
+import { describe, expect, it } from "vitest";
+import type { ProviderPlugin } from "../plugins/types.js";
+import { resolveRequestedLoginProviderOrThrow } from "./models/auth.js";
+
+function makeProvider(params: { id: string; label?: string; aliases?: string[] }): ProviderPlugin {
+  return {
+    id: params.id,
+    label: params.label ?? params.id,
+    aliases: params.aliases,
+    auth: [],
+  };
+}
+
+describe("resolveRequestedLoginProviderOrThrow", () => {
+  it("returns null when no provider was requested", () => {
+    const providers = [makeProvider({ id: "google-antigravity" })];
+    const result = resolveRequestedLoginProviderOrThrow(providers, undefined);
+    expect(result).toBeNull();
+  });
+
+  it("resolves requested provider by id", () => {
+    const providers = [
+      makeProvider({ id: "google-antigravity" }),
+      makeProvider({ id: "google-gemini-cli" }),
+    ];
+    const result = resolveRequestedLoginProviderOrThrow(providers, "google-antigravity");
+    expect(result?.id).toBe("google-antigravity");
+  });
+
+  it("resolves requested provider by alias", () => {
+    const providers = [makeProvider({ id: "google-antigravity", aliases: ["antigravity"] })];
+    const result = resolveRequestedLoginProviderOrThrow(providers, "antigravity");
+    expect(result?.id).toBe("google-antigravity");
+  });
+
+  it("throws when requested provider is not loaded", () => {
+    const providers = [
+      makeProvider({ id: "google-gemini-cli" }),
+      makeProvider({ id: "qwen-portal" }),
+    ];
+
+    expect(() =>
+      resolveRequestedLoginProviderOrThrow(providers, "google-antigravity"),
+    ).toThrowError(
+      'Unknown provider "google-antigravity". Loaded providers: google-gemini-cli, qwen-portal. Verify plugins via `openclaw plugins list --json`.',
+    );
+  });
+});