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.

Makefile

@@ -0,0 +1,23 @@
+.PHONY: lint shellcheck version install-tools hooks
+
+# Lint shell scripts
+shellcheck:
+	shellcheck scripts/*.sh
+
+# Lint everything
+lint: shellcheck
+
+# Version management
+version:
+	@grep '^metadata:' SKILL.md | grep -oP '"version":\s*"\K[^"]+'
+
+# Developer setup
+install-tools:
+	@echo "Checking lefthook..."
+	@command -v lefthook >/dev/null 2>&1 || (echo "Install lefthook: https://github.com/evilmartians/lefthook#install" && exit 1)
+	@echo "Checking shellcheck..."
+	@command -v shellcheck >/dev/null 2>&1 || (echo "Install shellcheck: https://github.com/koalaman/shellcheck#installing" && exit 1)
+	@echo "All tools installed."
+
+hooks:
+	lefthook install