chore: add project-level yayacal-release skill

.agents/skills/yayacal-release/SKILL.md

@@ -0,0 +1,74 @@
+---
+name: yayacal-release
+description: Use when the user asks to release a new version of the yayacal Android calendar app
+---
+
+# YaYa Release
+
+## Overview
+
+One-shot local release workflow for the yayacal Android app. All steps run on the developer machine using `gh` CLI.
+
+## When to Use
+
+- User says something like "发布 1.2.0", "release v1.3.0", "发一个新版本".
+- Working in `/Users/issuser/Developer/xfy/yayacal`.
+
+## Release Steps
+
+1. **Confirm version number** with the user if not provided.
+2. **Update version numbers**:
+   - `gradle.properties`: `app.version.base=x.y.z`
+   - `app/build.gradle.kts`: increment `versionCode` by 1
+3. **Update `CHANGELOG.md`**:
+   - Compare commits since the last tag: `git log <last-tag>..HEAD --pretty=format:"%s"`
+   - Group into Added / Changed / Fixed
+   - Insert `## [x.y.z] - YYYY-MM-DD` below `## [Unreleased]`
+   - Append `[x.y.z]: https://github.com/xfy/yayacal/releases/tag/vx.y.z` at the bottom
+4. **Commit** with the exact message:
+   ```bash
+   git add CHANGELOG.md gradle.properties app/build.gradle.kts
+   git commit -m "release: vx.y.z"
+   ```
+5. **Tag and push** (lightweight tag, matching previous releases):
+   ```bash
+   git tag vx.y.z
+   git push origin main --tags
+   ```
+6. **Build release APK**:
+   ```bash
+   ./gradlew :app:assembleRelease
+   ```
+7. **Create GitHub Release** with the current version's CHANGELOG as body:
+   ```bash
+   python3 - <<'PY'
+   import re
+   content = open('CHANGELOG.md').read()
+   m = re.search(r'## \[x.y.z\] - .*?\n(.*?)\n## \[', content, re.DOTALL)
+   open('/tmp/vx.y.z-notes.md', 'w').write(m.group(1).strip())
+   PY
+   gh release create vx.y.z \
+     app/build/outputs/apk/release/app-release.apk \
+     --title "YaYa vx.y.z" \
+     --notes-file /tmp/vx.y.z-notes.md
+   ```
+
+## Quick Reference
+
+| Item | Value |
+|---|---|
+| Version base | `gradle.properties` → `app.version.base` |
+| Version code | `app/build.gradle.kts` → `versionCode` |
+| APK path | `app/build/outputs/apk/release/app-release.apk` |
+| Commit message | `release: vx.y.z` |
+| Tag format | lightweight `vx.y.z` |
+| Release title | `YaYa vx.y.z` |
+| Signing | Keep existing debug signing; do **not** add release keystore logic |
+
+## Common Mistakes
+
+- **Wrong commit message**: Do not use `chore(release): ...` or `build: ...`. Use exactly `release: vx.y.z`.
+- **Annotated tag**: Previous releases use lightweight tags; do not add `-a`.
+- **Empty release body**: Always extract the current version's CHANGELOG section and pass it to `--notes-file`.
+- **Releasing from a dirty tree**: Run `git status` first; only release from a clean `main` branch.
+- **Forgetting to push the tag**: `git push origin main --tags` is required.