chore(skills): add pre-changelog skill (#902)

* chore(skills): add release-precheck skill

Add a project-scope agent skill that audits an open kimi-code release PR ("ci: release packages") before merge: it lists the changesets the release will publish, maps each to its source PR, scans the release window for merged PRs that forgot a changeset, and flags wrong bump levels, wrong packages, and non-compliant wording. Outputs the release PR link and a concise suggestion table.

* chore(skills): fix release-precheck package glob and base filter

* chore(skills): classify shipped apps/vis paths as needing changeset

* chore(skills): simplify release-precheck to principle-based audit

* chore(skills): scope release-precheck to changeset validation only

* chore(skills): surface possibly-missing changesets in release-precheck

* chore(skills): replace release-precheck with pre-changelog

.agents/skills/pre-changelog/SKILL.md

@@ -0,0 +1,66 @@
+---
+name: pre-changelog
+description: Use before merging a kimi-code release PR to preview the user-facing CLI changelog in Chinese. Reads the changelog that changesets pre-generated in the release PR, then reuses sync-changelog's strip / classify / translate logic to render a Chinese preview. Writes no files.
+---
+
+# Pre-Changelog
+
+Preview the user-facing **Chinese** changelog of an open `kimi-code` release PR **before** it is merged. Read-only: this skill writes no files and commits nothing.
+
+This skill reuses `sync-changelog`'s strip / classify / translate rules. Read `sync-changelog` first; only the data source (release PR diff instead of a published `CHANGELOG.md`) and the output (preview instead of docs files) differ.
+
+## Workflow
+
+### 1. Locate the release PR
+
+```bash
+gh pr list --state open --search "ci: release packages in:title" \
+  --json number,title,url,headRefName,baseRefName
+```
+
+Pick the one with `headRefName: changeset-release/main`; record `number`, `url` as `<RELEASE>`. If none is open, nothing to preview — stop.
+
+### 2. Read the pre-generated CLI changelog block
+
+changesets already pre-generates `apps/kimi-code/CHANGELOG.md` inside the release PR. Extract the new version block from the diff:
+
+```bash
+gh api repos/MoonshotAI/kimi-code/pulls/<RELEASE>/files \
+  --jq '.[] | select(.filename=="apps/kimi-code/CHANGELOG.md") | .patch'
+```
+
+Take the added lines (`+`) from the top `## <version>` down to (but not including) the next `## `. That is the version block to preview.
+
+If the CLI changelog is not in the diff (for example an SDK-only release), stop and tell the user — there is no user-facing CLI changelog to preview.
+
+### 3. Render the Chinese preview (reuse `sync-changelog`)
+
+Process the version block exactly as `sync-changelog` does for the docs site, but only in memory:
+
+- **Strip** (`sync-changelog` step 3): drop the H1, the `### Patch Changes` / `### Minor Changes` / `### Major Changes` subheadings, PR links, and commit-hash links; keep only each entry's body text.
+- **Classify** (`sync-changelog` step 4): bucket into Features / Bug Fixes / Polish / Refactors / Other; order within each section by reader value.
+- **Translate** (`sync-changelog` step 6): translate entry bodies to Chinese; section headings become 新功能 / 修复 / 优化 / 重构 / 其他.
+
+If an upstream entry is not in English, flag it and stop (changeset entries must be English).
+
+### 4. Output
+
+Print the preview directly. Use `<version>（预览）` as the heading because the version is not released yet. Write `无` for empty sections. Do not write any file.
+
+```
+发版 PR: <url>
+
+## <version>（预览）
+
+### 新功能
+- ...
+
+### 修复
+- ...
+```
+
+## Rules
+
+- Read-only. Never write `CHANGELOG.md`, docs files, or commit anything.
+- Classification, ordering, and translation follow `sync-changelog` exactly — do not reword or reclassify beyond what it specifies.
+- If the release PR has no CLI changelog diff, report it and stop.