feat: establish the bounded production architecture

include/session_manager.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include "app_config.h"
+#include "game_types.h"
+
+typedef struct { role_t role; bool occupied; uint8_t token[kSessionTokenBytes]; char name[kDisplayNameBytes + 1]; } session_t;
+typedef struct { session_t entries[kSessionCapacity]; } session_manager_t;