CRITICAL FIX: update.md was telling agents to uninstall bird CLI,
which broke users who had working bird installations. Now:
- twitter.py: prefers twitter-cli, falls back to bird/birdx if installed
- update.md: removed "clean up deprecated tools" step entirely
- Added explicit rule: "Never uninstall any existing tools the user already has"
- Tests cover twitter-cli primary + bird fallback + preference order
78 tests passing.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- 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