Closes#104
- Remove duplicate `self.maintenance_mode: bool = False` assignment (merge
artifact from PR #83)
- Delete dead `@self.tree.interaction_check` block in `setup_hook` that
generated a RuntimeWarning at startup; `MaintenanceAwareTree.interaction_check()`
already handles this correctly via the `tree_cls=MaintenanceAwareTree` kwarg
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>