The Teacher Mode feature stays out of the default UI per the 2.0
roadmap — backend escalation is already dormant when teacher_model is
unset (its default) and we want to focus on core reliability before
surfacing escalation as a feature.
Nothing removed from the backend:
- src/teacher_escalation.py still gates on get_setting('teacher_model')
- agent_loop.py's run_teacher_inline hook is a no-op without the setting
- settings backup/restore round-trips the teacher_model key unchanged
- power users can still set it via manage_settings or the JSON backup
settings.js's initTeacherModel already early-returns when the card's
DOM ids are missing, so the JS side is clean.
To re-surface the card, revert this commit.
3247773447