diff --git a/.gitignore b/.gitignore
index 2f3246b13..203492e4e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,3 +25,15 @@ docs/superpowers/
reports/
.superpowers/
/plan/
+
+# Agent scratch / throwaway files - do not commit
+.tmp/
+HANDOVER*.md
+HANDOFF*.md
+handoff.md
+handover.md
+*-designs.html
+*-design.html
+*-mockup.html
+*-demo.html
+*-demos.html
diff --git a/AGENTS.md b/AGENTS.md
index a9f77b457..f8cdf7c10 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -77,3 +77,7 @@ This is a TypeScript monorepo built for agent-assisted development. Keep the roo
- After finishing a task and before submitting a PR, you must run the `gen-changesets` skill (see `.agents/skills/gen-changesets/SKILL.md`) and generate a changeset under `.changeset/` according to its rules.
- When generating a changeset, **never** decide on a `major` bump on your own. When you judge a change to meet the major criteria (breaking changes, incompatible user configuration, renamed or removed commands/arguments, changed behavior semantics, etc.), you must stop and explain it to the user and ask for confirmation. **Only write `major` after the user has explicitly agreed.** Otherwise default to `minor` (and fall back to `patch` if `minor` is unclear). See the "Hard rule: confirm with the user before writing `major`" section in `.agents/skills/gen-changesets/SKILL.md` for details.
- Prefer importing via `import ... from '#/...'`, which serves the same purpose as `import ... from '@/...'`.
+- Do not commit throwaway scratch or exploratory files. Never stage:
+ - Agent working notes or handoff/summary documents (e.g. `HANDOVER-*.md`, `HANDOFF-*.md`, `handoff.md`).
+ - Throwaway UI/UX prototypes or design mockups (e.g. `*-designs.html`, `*-mockup.html`, `*-demo(s).html`) at the repo root or under a `design/` folder. The only tracked `.html` files should be Vite `index.html` entrypoints.
+ Before committing or opening a PR, run `git status` and `git diff --staged --stat` and remove anything matching these patterns. Put scratch work under `.tmp/` (gitignored) instead of the repo root or the source tree.
diff --git a/HANDOVER-kimi-web-table-width.md b/HANDOVER-kimi-web-table-width.md
deleted file mode 100644
index c3ac05613..000000000
--- a/HANDOVER-kimi-web-table-width.md
+++ /dev/null
@@ -1,149 +0,0 @@
-# 接手文档：kimi-web 聊天表格宽度
-
-> **当前状态（未提交，用户先用着）**：表格在阅读列（≈760px）内**单元格换行**显示——
-> 不横向滚动、不溢出、不裁切，但**没有比正文更宽**。这是目前效果最干净、可以先用的版本。
->
-> **仍未达成的目标**：让宽表格像 Manus 那样**突破到比正文更宽的列**再换行。两次突破尝试
-> （容器单位 `cqw`、固定 px `@container` 断点）都没做出满意效果，已回退/停用，见 §4、§6。
->
-> **只改了 1 个文件**：`apps/kimi-web/src/components/chat/Markdown.vue`（表格样式块）。
-> typecheck / check:style 通过。
-
-## 1. 背景与目标
-
-`apps/kimi-web` 聊天里 markstream 渲染的 markdown 表格，默认被钉在阅读列宽内
-（`width:100%` + `table-layout:fixed`），宽表格要么被挤成很窄的列、要么表格内横向滚动。
-
-用户想要的最终效果（参照 Manus 截图）：
-
-1. 表格**比正文阅读列更宽**（横向铺开），但
-2. 单元格**换行**，所以表格**永不横向滚动**（表格自身和对话面板都不滚），且
-3. 正文 / 代码 / diff / 工具块 / thinking 等其它块仍限在 760px 阅读列内。
-
-> 第 1 点（撑得比正文宽）目前**没做到**——见 §6。当前上线的是"列内换行"的降级版。
-
-## 2. 当前实现（列内换行版，正在用）
-
-`Markdown.vue` `
-
-
-
-