refactor(core): migrate to Bun and converge acquisition policies and Agent boundaries

apps/server/test/e2e/websearch.test.ts

@@ -52,7 +52,7 @@ const mockFetch = (async (input: string | URL | Request, init?: RequestInit) =>
   if (url.href === NOTICE_URL)
     return new Response(NOTICE_HTML, { headers: { "content-type": "text/html; charset=utf-8" } });
   return new Response("not found", { status: 404 });
-}) as typeof fetch;
+}) as (input: RequestInfo | URL, init?: RequestInit) => Promise<Response>;
 
 const resolveHost = async (host: string) => (host.endsWith("example.org") ? ["93.184.216.34"] : ["203.0.114.10"]);