Add support for multiple minion squads in enemy group.

[christianaustin85]

Removed validation logic that limited minion squads to 1.

[seedback]

Looks good to me, but shouldn't we allow one captain per minion squad?

[scottTomaszewski]

Thanks for this, and sorry for the slow reply — you had the right cap in your sights.

Multi-squad support has since landed on develop as part of the initiative tracker overhaul (closes #67; shipping in 7.0.0). It relaxes the same validation this PR removes, but it also had to move the shared Stamina pool from the enemy group onto each squad, add captain_of so a captain can name its squad, and keep one-squad encounters byte-identical — which is why it went in as a larger change rather than through this PR. This branch also targets main, which is release-only now; feature work goes to develop.

Closing as superseded. If you spot anything the landed version gets wrong for the Delian Tomb W1 case, please open an issue — happy to take a follow-up.