Adds the HeykelSavasiTeam enum (None/Red/Blue) and the HeykelSavasiContext
skeleton (subclass of MiniGameContext) with team registration
(AssignTeam/GetTeam/PlayersOf/TeamCount) and a join-balance rule
(|Red-Blue| <= 2 after the prospective join), exposed as a pure static
IsJoinAllowed for fast unit testing without constructing the full context.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
968eb0c155