Add antitrust email group (#2)

Sets up antitrust@modelcontextprotocol.io email group

src/config/groups.ts

@@ -2,6 +2,9 @@ import { defineGroups } from './utils';
 
 // NOTE: For GitHub teams, only the first memberOf will be used as the parent team.
 // GitHub only supports one parent team per team.
+//
+// Email groups (isEmailGroup: true) accept emails from anyone (including external users)
+// and notify group members for each email.
 export const GROUPS = defineGroups([
   {
     name: 'test-parent',
@@ -12,4 +15,14 @@ export const GROUPS = defineGroups([
     description: 'Registry maintainers',
     memberOf: ['test-parent'],
   },
+  {
+    name: 'test-email-group',
+    description: 'Example email group that accepts external emails',
+    isEmailGroup: true,
+  },
+  {
+    name: 'antitrust',
+    description: 'Antitrust compliance contacts',
+    isEmailGroup: true,
+  },
 ] as const);