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

packages/adapters/src/sites/http.ts

@@ -6,7 +6,7 @@ import { SiteError } from "./types.ts";
 
 export interface SiteHttpContext {
   siteId: string;
-  fetch: typeof globalThis.fetch;
+  fetch: (input: RequestInfo | URL, init?: RequestInit) => Promise<Response>;
   limiter: SiteRateLimiter;
   timeoutMs: number;
   userAgent?: string;