chore: import upstream snapshot with attribution

reasonix-skill/scripts/install.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SKILL_DIR="$(cd "${SCRIPT_DIR}/.." && pwd)"
+: "${HOME:?HOME must be set to install a global Reasonix skill}"
+DEST_ROOT="${HOME}/.reasonix/skills"
+DEST_DIR="${DEST_ROOT}/cli-anything"
+
+mkdir -p "${DEST_ROOT}"
+
+if [[ -e "${DEST_DIR}" ]]; then
+  echo "Refusing to overwrite existing skill: ${DEST_DIR}" >&2
+  echo "Remove it manually if you want to reinstall." >&2
+  exit 1
+fi
+
+cp -R "${SKILL_DIR}" "${DEST_DIR}"
+
+echo "Installed Reasonix skill to: ${DEST_DIR}"
+echo "Restart Reasonix to pick up the new skill."