chore: add upload_release workflow

Author: hooosberg

.agent/workflows/upload_release.md

@@ -0,0 +1,61 @@
+---
+description: Upload release packages to GitHub Releases
+---
+
+# Upload Packages to GitHub Releases
+
+Upload built packages to GitHub Releases page for distribution.
+
+## Prerequisites
+- All packages built and available in `release/` directory
+- GitHub CLI installed (`brew install gh`) and authenticated (`gh auth login`)
+
+## Packages to Upload
+- `GlotShot-{version}-arm64.dmg` - macOS Apple Silicon
+- `GlotShot-{version}-x64.exe` - Windows x64
+- `GlotShot-{version}-arm64.exe` - Windows ARM64
+- `GlotShot-{version}-x86_64.AppImage` - Linux x64
+- `GlotShot-{version}-arm64.AppImage` - Linux ARM64
+
+## Upload Process
+
+### 1. Create Release on GitHub
+```bash
+gh release create v{version} --title "GlotShot v{version}" --notes-file RELEASE_NOTES.md
+```
+
+### 2. Upload Packages
+// turbo
+```bash
+gh release upload v{version} release/GlotShot-{version}-*.dmg release/GlotShot-{version}-*.exe release/GlotShot-{version}-*.AppImage --clobber
+```
+
+## Release Notes Template
+Create `RELEASE_NOTES.md` with:
+
+```markdown
+# GlotShot v{version}
+
+## Downloads
+
+| Platform | Architecture | Download |
+|----------|--------------|----------|
+| macOS | Apple Silicon | GlotShot-{version}-arm64.dmg |
+| Windows | x64 | GlotShot-{version}-x64.exe |
+| Windows | ARM64 | GlotShot-{version}-arm64.exe |
+| Linux | x64 | GlotShot-{version}-x86_64.AppImage |
+| Linux | ARM64 | GlotShot-{version}-arm64.AppImage |
+
+## What's New
+- [List changes here]
+
+## System Requirements
+- macOS 11.0+ (Big Sur or later)
+- Windows 10+ (64-bit)
+- Linux: Ubuntu 20.04+ or compatible
+```
+
+## Notes
+- **DO NOT** use `git push` for release packages (GitHub file size limit is 100MB)
+- Always use GitHub Releases for distributing installers
+- Use `--clobber` flag to replace existing files when re-uploading