fix(auth): allow implicit social signup

packages/auth/src/config.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from "vitest";
+import { env } from "@reactive-resume/env/server";
+import { auth } from "./config";
+
+describe("social provider signup policy", () => {
+	it.each(["google", "github", "linkedin"] as const)(
+		"allows implicit signup through %s while honoring the global signup restriction",
+		(provider) => {
+			const config = auth.options.socialProviders?.[provider];
+
+			expect(config).not.toHaveProperty("disableImplicitSignUp");
+			expect(config?.disableSignUp).toBe(env.FLAG_DISABLE_SIGNUPS);
+		},
+	);
+});