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

CONTRIBUTING.md

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+# Contributing to Deskify
+
+First off, thank you for considering contributing to Deskify! It's people like you that make Deskify such a great tool.
+
+`deskify` is currently in an **Alpha / Early MVP** phase. Contributions that improve reliability, error handling, tests, and Linux compatibility are especially valuable.
+
+## How Can I Contribute?
+
+### Reporting Bugs
+This section guides you through submitting a bug report for Deskify. Following these guidelines helps maintainers and the community understand your report, reproduce the behavior, and find related reports.
+
+* Use a clear and descriptive title for the issue to identify the problem.
+* Describe the exact steps which reproduce the problem in as many details as possible.
+* Provide specific examples to demonstrate the steps.
+
+### Suggesting Enhancements
+This section guides you through submitting an enhancement suggestion for Deskify, including completely new features and minor improvements to existing functionality.
+
+* Use a clear and descriptive title for the issue to identify the suggestion.
+* Provide a step-by-step description of the suggested enhancement in as many details as possible.
+* Explain why this enhancement would be useful to most Deskify users.
+
+### Pull Requests
+* Fill in the required template
+* Do not include issue numbers in the PR title
+* Include screenshots only when UI/desktop integration behavior is relevant.
+* Follow the Rust styleguide (`cargo fmt`).
+* Document new code based on the existing documentation style.
+* End all files with a newline.
+* Prefer small, focused PRs (one behavioral change per PR).
+
+## Development Setup
+1. Deskify relies on `tauri`. Ensure `tauri-cli` is installed via `cargo install tauri-cli`.
+2. Ensure you have the standard Tauri dependencies for Linux (WebKit2GTK, etc.).
+3. Clone the repository and run `cargo build` to test your changes.
+4. Run `cargo clippy` to check for common mistakes and improve your Rust code.
+
+## Local Checks Before Opening a PR
+
+Run these checks locally before submitting a pull request:
+
+```bash
+cargo fmt --check
+cargo clippy --all-targets --all-features -- -D warnings
+cargo test
+cargo check
+```
+
+## Manual Smoke Test (Recommended for Behavior Changes)
+
+If your change affects build/install/list/remove behavior, run a quick smoke test:
+
+```bash
+deskify build --url "https://example.com" --name "Example"
+deskify list
+deskify remove example
+```
+
+Also verify invalid IDs are rejected safely:
+
+```bash
+deskify remove ../foo
+deskify remove FooBar
+```