feat: initial open-source project structure

Agent Skill for searching and downloading torrents via TorrentClaw.
Includes SKILL.md with OpenClaw metadata, bash scripts for torrent
client detection, CONTRIBUTING.md, CHANGELOG.md, CI/CD with GitHub
Actions (shellcheck + conventional commits), lefthook git hooks,
Makefile, and .editorconfig.

CONTRIBUTING.md

@@ -0,0 +1,65 @@
+# Contributing to torrentclaw-skill
+
+Thanks for your interest in contributing! Here's how you can help.
+
+## Getting Started
+
+1. Fork the repository
+2. Clone your fork: `git clone https://github.com/<your-user>/torrentclaw-skill.git`
+3. Install dev tools and git hooks:
+   ```bash
+   make install-tools
+   make hooks
+   ```
+4. Create a branch: `git checkout -b feat/my-feature`
+5. Make your changes
+6. Lint locally: `make lint`
+7. Commit with a clear message (see below) — the commit-msg hook will validate the format
+8. Push and open a Pull Request
+
+## Requirements
+
+- Bash 4+
+- [shellcheck](https://github.com/koalaman/shellcheck) (installed via your package manager)
+- [lefthook](https://github.com/evilmartians/lefthook) (installed via your package manager)
+
+## Commit Messages
+
+Commits are validated automatically by a git hook. We follow [Conventional Commits](https://www.conventionalcommits.org/):
+
+```
+<type>[optional scope][!]: <description>
+```
+
+Valid types: `feat`, `fix`, `docs`, `style`, `refactor`, `perf`, `test`, `build`, `ci`, `chore`, `revert`
+
+Examples:
+
+```
+feat: add qBittorrent client detection
+fix(detect): correct aria2 daemon check on macOS
+docs: update API reference with new endpoints
+chore: update shellcheck to latest version
+feat!: redesign install guide output format
+```
+
+## Code Style
+
+- All shell scripts must pass `shellcheck`
+- Use `#!/usr/bin/env bash` as the shebang
+- Use `set -euo pipefail` at the top of every script
+- Keep functions focused and small
+- Add comments only where the logic isn't self-evident
+
+## Reporting Bugs
+
+Open an issue with:
+
+- What you expected to happen
+- What actually happened
+- Steps to reproduce
+- Your OS and bash version
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the project's [MIT License](LICENSE).