Multi-agent Agent Skill support.
- Adds Agent Skills compatibility metadata for Codex, OpenCode, Pi, Gemini CLI, and Claude Code.
- Documents per-agent install/use paths in the README.
- Adds or updates package.json
skillandpi.skillsmetadata for Git-installed packages. - Notes that non-Claude hosts load the Guardrails instructions; Claude Code plugin installs still provide the bundled lifecycle hooks.