- feat(agents): per-project model/effort override editor in Agent Library
- feat(agents): field-merge project persona overlay
- feat(models): live model/effort catalog + pickers
- feat(scheduler): durable planId, per-wave plans
- feat(epics): per-Epic model/effort override
- refactor(epics): remove Merge to main button

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>