Phase 2: Adds dedicated tmux window support:
- gt feed --window creates 'feed' window in current session
- If window exists, switches to it (idempotent)
- Always uses --follow mode in window (persistent stream)
- Error handling for non-tmux environments
Users can now C-b n/p to cycle to/from the activity feed.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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