Implement Lesser Spawn

(cantrip) (spawn phase) (2) Spawn target minion in your reinforcements next to target friendly minion

Start by locating the existing cantrip and spawn-phase handling in the Scala game code. Trace how a target friendly minion and its reinforcements are represented, then implement the Lesser Spawn behavior described in the issue. Done means a target minion can receive a spawned minion in its reinforcements next to it during the spawn phase.

Written by the indexing model from the issue text.