docs: integrate x-twitter-growth across plugin ecosystem and documentation
- Sync Gemini CLI (208 items), verify Codex CLI (151 skills)
- Update marketplace.json: 151 packages, marketing 43, tools 245
- Update marketing plugin.json with X/Twitter growth, 43 skills
- Update CLAUDE.md, README.md, docs/index.md, getting-started.md counts
(172 skills, 245 tools, 344 references)
- Add x-twitter-growth to marketing CLAUDE.md skill map
- Add x-twitter-growth docs page and mkdocs.yml nav entry
- Regenerate 207 MkDocs pages, build verified
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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