Add /links endpoint and bump posts default limit to 50
- GET /links?url=:url — find all Bluesky posts linking to a URL or domain
(uses app.bsky.feed.searchPosts url param, native Bluesky feature)
- Bump default posts limit from 20 → 50 across getFeed and the route
- Document /links in README, llms.txt, docs, skill.md, cli, homepage
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>