#19497: docs: add Smart Spawn to community plugins

Adds [Smart Spawn](https://github.com/deeflect/smart-spawn) to the community plugins list. **Smart Spawn** — Intelligent model routing for sub-agents. Automatically picks the best AI model for any task using real benchmark data from 5 sources. - **npm:** `@deeflectcom/smart-spawn` - **repo:** https://github.com/deeflect/smart-spawn - **install:** `openclaw plugins install @deeflectcom/smart-spawn` - **API:** https://ss.deeflect.com/api ### Meets listing requirements: - ✅ Published on npmjs - ✅ Public GitHub repo - ✅ Setup/use docs + issue tracker - ✅ Active maintainer <!-- greptile_comment --> <h3>Greptile Summary</h3> Adds Smart Spawn as the first community plugin to the listing page. The entry follows the documented format exactly and includes all required fields (name, description, npm package, repo, install command). <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with no risk - This is a simple documentation addition that adds a community plugin entry following the exact template format. No code changes, no security concerns, and formatting is correct. - No files require special attention _{Last reviewed commit: 6708ec5} <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->