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

packages/db/test/rate-limit.test.ts

@@ -1,4 +1,5 @@
 import { fileURLToPath } from "node:url";
+import { Command } from "@umt/runtime";
 import { Kysely, PostgresDialect, sql } from "kysely";
 import pg from "pg";
 import { afterAll, beforeAll, describe, expect, it } from "vitest";
@@ -70,8 +71,8 @@ describe.skipIf(skip)("PgTokenBucket(真实 PG)", () => {
     const rate = 20;
     const perProc = 12;
     const procs = [0, 1, 2].map(() =>
-      new Deno.Command(Deno.execPath(), {
-        args: ["run", "-A", script, url, schema, "t:procs", String(perProc), String(capacity), String(rate)],
+      new Command(process.execPath, {
+        args: [script, url, schema, "t:procs", String(perProc), String(capacity), String(rate)],
         stdout: "piped",
         stderr: "piped",
       }).output(),