v0.2.1

修复

• CLI 运行时错误（解析失败、桶不存在、拒绝访问等 handler 错误）恢复退出码 1
  （v0.2.0 中未分类错误被 xyz 前端按用法错误处理、退出 2）；用法类错误
  （未知 flag、位置参数数量不符）仍按 xyz 语义退出 2

---

v0.2.1 — fix runtime-error exit codes

Fix

• Runtime handler errors (parse failures, missing buckets, access denials)
  exit 1 again (in v0.2.0 uncoded errors were treated as usage errors and
  exited 2); usage errors (unknown flags, positional-count mismatches) keep
  xyz's exit code 2