20260609_01(skills.name_zh)直接挂在 20260608_01 之下,与 20260608_02..06(chain-stages/parallel-agent 分支)形成两个 head,导致 `alembic upgrade head` 报 Multiple head revisions。新增空 merge 版本 20260609_02 同时指向 20260608_06 与 20260609_01,使 head 归一。 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>