Set up basic deterministic lockstep

src/game_server/InternalGameServer.h

@@ -23,6 +23,9 @@ public:
 	void update(std::int64_t deltaMs) override;
 	void save(nlohmann::json& out) const override;
 	void load(const nlohmann::json& in) override;
+	void setLocalPlayerId(std::string playerId) {
+		localPlayerId_ = std::move(playerId);
+	}
 	void startCampaign(
 		const CampaignConfig& campaign, const std::string& zipFile,
 		bool createLocalPlayer, bool enableTestBot) override;
@@ -32,6 +35,7 @@ public:
 private:
 	friend class LocalGameServerHost;
 	friend class RemoteGameServerHost;
+	friend class WebsocketGameClient;
 
 	// Host-only lifecycle operations. They never expose authoritative state and
 	// are intentionally absent from IGameServer.
@@ -49,6 +53,7 @@ private:
 	GameState state_;
 	std::string localPlayerId_ = "player";
 	std::string resourceZipFile_;
+	std::vector<std::string> networkPlayerSlots_;
 	std::int64_t battleZoneTestBotElapsedMs_ = 0;
 	bool battleZoneTestBotEnabled_ = false;
 	std::string pendingSimulationLocationId_;