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

apps/server/test/sources-identity/identity-differential.run.ts

@@ -2,7 +2,7 @@
  * 重新录制身份匹配差分(ID-2):我们侧的 TMDB 请求走本地缓存代理(scratchpad tmdb_proxy.py,上行计数封顶),
  * 录下的响应裁剪后写入 tmdb-fixtures.json,逐条结果写入 ours.json 并打印汇总。
  *
- *   TMDB_PROXY=http://127.0.0.1:18731 deno run -A apps/server/test/sources-identity/identity-differential.run.ts
+ *   TMDB_PROXY=http://127.0.0.1:18731 bun apps/server/test/sources-identity/identity-differential.run.ts
  */
 import { writeFileSync } from "node:fs";
 import { join } from "node:path";
@@ -16,9 +16,9 @@ import {
   trimTmdb,
 } from "./identity-differential.lib.ts";
 
-const proxy = Deno.env.get("TMDB_PROXY") ?? "http://127.0.0.1:18731";
+const proxy = process.env.TMDB_PROXY ?? "http://127.0.0.1:18731";
 const fixtures: Record<string, unknown> = {};
-const recording: typeof fetch = async (input, init) => {
+const recording: (input: RequestInfo | URL, init?: RequestInit) => Promise<Response> = async (input, init) => {
   const url = typeof input === "string" ? input : input instanceof URL ? input.href : input.url;
   const res = await fetch(url, init);
   const body = await res.clone().json();