feat: establish the bounded production architecture

include/command_queue.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "app_config.h"
+#include "game_types.h"
+
+typedef uint8_t command_type_t;
+enum { COMMAND_CONFIG, COMMAND_START, COMMAND_SHOT, COMMAND_REMATCH, COMMAND_ABORT };
+typedef struct { command_type_t type; uint8_t session_index; uint32_t game_id; uint32_t version; coordinate_t coordinate; game_mode_t mode; } app_command_t;
+typedef struct { app_command_t entries[kCommandQueueCapacity]; uint8_t head; uint8_t tail; uint8_t count; } command_queue_t;
+
+bool command_queue_push(command_queue_t *queue, const app_command_t *command);
+bool command_queue_pop(command_queue_t *queue, app_command_t *command);
+_Static_assert(sizeof(command_queue_t) <= 320, "command queue grew beyond fixed budget");