feat: centralize application framework primitives

packages/auth/src/routes/api/oauth-[provider]-callback.ts

@@ -0,0 +1,6 @@
+import type { Context } from "@wrnexus/core";
+import { invokeAuthHandler } from "../api.ts";
+
+export function GET(ctx: Context): Promise<Response> {
+  return invokeAuthHandler("completeOAuth", ctx);
+}