community: add Phase 6 marketplace integration and contribution guides
ClawdHub Web UI Integration:
- Add ClawdHub API client (search, details, install, updates)
- Add Gateway RPC handlers with auth scopes
- Add Marketplace tab with browse/installed views
- Add state management and Lit HTML components
Documentation:
- Add feature maturity matrix classifying 100+ features
- Add skills contribution guide (SKILL.md format, gating, publishing)
- Add plugins contribution guide (manifest, API, distribution)
- Update CONTRIBUTING.md with links to new guides
- Add Contributing section to docs navigation
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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