Changelog entry
Manual era promotion (no auto-advance on tick)
2026-03-19
- Nations no longer auto-promote to the next era when gate requirements are met during tick processing.
- Progression now shows explicit era-promotion readiness and a `Promote Era` action; players can remain in their current era until they confirm.
- Promotion attempts are server-validated and return stable reason codes on failure; successful promotions write an era-confirmation event log.