The backend registry now intelligently selects the appropriate pane backend:
- Detects iTerm2 and checks for it2 CLI availability
- Prefers iTerm2 native split panes when available
- Falls back to tmux with informative messaging
- Supports user preference for tmux over iTerm2
Evidence
[BackendRegistry] Selected: iterm2 (native iTerm2 with it2 CLI), [BackendRegistry] Selected: tmux (fallback in iTerm2, it2 setup recommended)
Strings lifted out of the shipped bundle, so the claim above can be checked against them.