feat: redesign match play and add broadcast tooling

src/lib/auth-identity.test.ts

@@ -0,0 +1,11 @@
+import { expect, test } from 'vitest';
+import { contactEmail, newAuthIdentity } from './auth-identity';
+
+test('internal identities are never contact email addresses', () => {
+	expect(contactEmail('123@osu.local')).toBeNull();
+	expect(contactEmail('123@discord.local')).toBeNull();
+	expect(contactEmail(newAuthIdentity())).toBeNull();
+	expect(contactEmail(null)).toBeNull();
+	expect(contactEmail(' Person@Example.com ')).toBe('person@example.com');
+	expect(newAuthIdentity()).not.toBe(newAuthIdentity());
+});