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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>