Introduce two new plugins: dioxus and project-uv with metadata
READMEs and SKILL documentation and example skill files
Update marketplace.json to advertise both plugins
The single ai-skills plugin becomes plugins/g4b_ai/ inside a
reliquary-named Claude marketplace. Root README/CLAUDE.md now
describe the marketplace; the plugin's own docs move alongside it.
This makes room for additional themed plugins and non-Claude
formats in parallel.
g4borg