refactor: decouple game participants from human players

[Enn3Developer]

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[claude]

Claude finished @Enn3Developer's task in 21s —— View job

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Summary

Introduces an IPlayer interface so game logic can accept any participant (human or future bot), instead of being hard-coded to the Player record.

Changes

• Common: Added IPlayer interface (Tribe, Id) in Player.cs; Player now implements it instead of being the concrete type consumers depend on.
• Common/Gameplay: Game constructor now takes IReadOnlyList<IPlayer> players instead of IReadOnlyList<Player>.
• Common: TerrainGeneration constructor now takes IPlayer[] players instead of Player[].
• Tests: Added PlayerAbstractionTest, which defines a TestBot : IPlayer and verifies terrain generation, game start, and turn alternation work with a mixed Player/TestBot roster.

Worth a look

• Public constructor signatures for Game and TerrainGeneration changed types (source-compatible for callers passing Player[]/lists, but a breaking API change for any external code referencing the old parameter types directly).