Prepare GitHub alpha launch (README, CI, tests, release workflow)

CHANGELOG.md

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+# Changelog
+
+All notable changes to `deskify` will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project follows early MVP/alpha versioning with tags like `v0.1.0-alpha.1`.
+
+## [Unreleased]
+
+## [v0.1.0-alpha.1] - 2026-02-23
+
+### Added
+- Initial public MVP/alpha release of `deskify` (Linux-only)
+- CLI commands:
+  - `deskify build --url <URL> --name <NAME>`
+  - `deskify list`
+  - `deskify remove <internal-id>`
+- `build` supports advanced options:
+  - `--icon`
+  - `--fullscreen`
+  - `--user-agent`
+  - `--dark-mode`
+  - `--width`
+  - `--height`
+- Tauri-based wrapper generation in a temporary build directory
+- XDG desktop integration:
+  - installs wrapper binary into local executable directory (`~/.local/bin` fallback)
+  - creates `.desktop` launcher in `~/.local/share/applications`
+  - installs app icon into `~/.local/share/icons/hicolor/128x128/apps`
+- Automatic favicon download from Google Favicon API with dummy-icon fallback
+- `.desktop` metadata marker (`X-Deskify-Managed=true`) for more reliable app discovery
+- Unit tests for:
+  - app ID sanitization
+  - `remove` ID validation
+  - Deskify desktop entry detection (marker + legacy fallback)
+- GitHub CI workflow (`cargo fmt --check`, `cargo clippy`, `cargo test`, `cargo check`)
+- Tag-based GitHub Release workflow to upload a Linux `deskify` CLI binary
+- GitHub PR template and release-note categorization config
+
+### Changed
+- `tauri.conf.json` generation now uses structured JSON serialization (`serde_json`) instead of manual string interpolation
+- App discovery in `list` prefers the Deskify marker and keeps a legacy heuristic fallback for older installs
+- Documentation updated for alpha/MVP positioning, known limitations, smoke tests, and release tagging (`v0.1.0-alpha.N`)
+
+### Fixed
+- `remove` now validates internal IDs and rejects unsafe values (for example path traversal inputs like `../foo`)
+- Generated Tauri config creation is more robust for names/URLs/user agents containing special characters