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

apps/server/test/support/pg.ts

@@ -6,7 +6,7 @@ import pg from "pg";
 
 export const PG_URL = process.env.DATABASE_URL ?? "postgres://umt:umt@localhost:55433/umt";
 
-/** 测试库连得上才跑 PG 用例;UMT_SKIP_DB_TESTS=1 显式跳过(deno task test:all 连不上库时直接失败) */
+/** 测试库连得上才跑 PG 用例;UMT_SKIP_DB_TESTS=1 显式跳过(bun run test:all 连不上库时直接失败) */
 export async function pgAvailable(): Promise<boolean> {
   if (process.env.UMT_SKIP_DB_TESTS === "1") return false;
   const c = new pg.Client({ connectionString: PG_URL, connectionTimeoutMillis: 2000 });