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

apps/server/test/system/system.test.ts

@@ -4,6 +4,7 @@ import { join } from "node:path";
 import type { DiskUsage } from "@umt/adapters";
 import { SystemHealth, SystemHealthHistory, SystemResources } from "@umt/contracts";
 import { sql } from "@umt/db";
+import { runtimeMkdir, runtimeWriteTextFile } from "@umt/runtime";
 import { afterAll, beforeAll, describe, expect, it } from "vitest";
 import { inferTriggeredBy, triggeredByFromActor } from "../../src/modules/auth-settings/engine-business.ts";
 import { scheduleRegistry } from "../../src/modules/schedules/registry.ts";
@@ -233,8 +234,8 @@ describe.skipIf(!hasPg)("W9-I 进程与健康(真实 PG)", () => {
       ctx: h.ctx,
     }) as Harness["app"];
     admin = bearer(h.app, DEV_KEY);
-    await Deno.mkdir(libOk, { recursive: true });
-    await Deno.writeTextFile(join(libOk, ".umt-root"), "x");
+    await runtimeMkdir(libOk, { recursive: true });
+    await runtimeWriteTextFile(join(libOk, ".umt-root"), "x");
   }, 60_000);
   afterAll(async () => {
     await h?.close();