- Replace xreach CLI with bird (@steipete/bird) as Twitter/X backend
- bird uses AUTH_TOKEN/CT0 env vars (simpler than xreach's session.json)
- Accept both 'bird' and 'birdx' binary names
- Remove version detection logic (bird v0.8.0 is the baseline)
- Write credentials.env to ~/.config/bird/ for easy sourcing
- Keep xfetch session.json sync for backward compatibility
- Update SKILL.md commands: bird search/read/user-tweets/thread
- Update install/uninstall to use npm @steipete/bird
- All 52 tests pass
- docs/README_en.md: update FAQ, Works Out of the Box, Design Philosophy
- docs/troubleshooting.md: Exa fallback uses mcporter directly
- agent_reach/guides/setup-exa.md: test with mcporter call
- agent_reach/guides/setup-wechat.md: test with Jina Reader