Initial commit

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/state.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <string>
+
+struct Game;
+
+// The whole simulation as bytes, to hand a player joining a game already running. The game state is plain data that
+// lays out the same on every platform (no pointers or heap inside the structs; see Attack and FixedList), so most of it
+// goes as it sits in memory, and the few lists as a count and their items. It starts with a layout signature (the sizes
+// of everything), so a build that lays things out differently refuses it rather than loading garbage. The menu and
+// everything else this screen alone sees isn't part of it, nor is the bots' map of the world, rebuilt on loading.
+std::string state_save(Game& game);
+bool state_load(Game& game, const std::string& bytes);