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

apps/server/test/e2e/agent-prompt-eval.real.test.ts

@@ -14,7 +14,7 @@ import { createE2E, type E2E, pgAvailable, runEvents, runRow, waitFor } from "./
 // 运行(凭证只经环境变量传入,不写进代码与报告):
 //   UMT_EVAL_REAL=1 UMT_EVAL_API_KEY=… UMT_EVAL_PROVIDER=opencode-go UMT_EVAL_MODEL=deepseek-v4.1-flash \
 //   UMT_EVAL_LEGACY_PROMPT=/tmp/legacy-system-prompt.ts UMT_EVAL_CASES=health,acquire,why UMT_EVAL_OUT=/tmp/eval.json \
-//   DATABASE_URL=… deno run -A npm:vitest run test/e2e/agent-prompt-eval.real.test.ts
+//   DATABASE_URL=… bun --bun x vitest run test/e2e/agent-prompt-eval.real.test.ts
 // UMT_EVAL_LEGACY_PROMPT 用 `git show main:packages/agent/src/system-prompt.ts > /tmp/legacy-system-prompt.ts` 生成;
 // UMT_EVAL_PROMPTS=legacy,layered 控制跑哪几组(缺省两组都跑)。