v6.1.1

• #3723: Fix @magda/mgd npm package publishing without its bin/mgd.js CLI bundle, which made npm install -g @magda/mgd install a broken mgd executable.
• #3724: Fix mgd skills install --agent codex installing the global Codex skill to ~/.codex/skills instead of the discovered ~/.agents/skills location (install/uninstall now also clean up the legacy path), and harden the coding-agent install prompts in the README to resolve a Node.js 22+ runtime via an existing version manager in non-interactive shells where bare node/npm is not on PATH.