feat: rng & commands impl & tests

src/core/context.ts

@@ -26,7 +26,7 @@ export const GameContext = createModel((root: Context) => {
             }
         }
     }
-    
+
     return {
         parts,
         regions,
@@ -35,4 +35,9 @@ export const GameContext = createModel((root: Context) => {
         popContext,
         latestContext,
     }
-})
+})
+
+/** 创建游戏上下文实例 */
+export function createGameContext(root: Context = { type: 'game' }) {
+    return new GameContext(root);
+}