Documentation Update

This regenerates your marketplace docs whenever you add or update a plugin. It reads marketplace.json and your plugin catalog, then runs Jinja2 templates to rebuild agents.md, agent-skills.md, plugins.md, and usage.md. The Python script extracts frontmatter from agent files and skill metadata, organizes everything by category, and writes fresh documentation. You'd run this after every plugin change to keep your docs in sync with your actual marketplace state. It's meant to be hooked into the create and update commands so documentation never drifts. The templates live in assets/ and get the full marketplace context plus stats and component indexes.