迭代11第②批：GP商店房重构——三选一同构化（P1共享池账本+抽3买1全重抽+A/b乘法定价ceil+断点扩键+货架同构呈现+MC off/on分层；冒烟671/0+off对拍off_n60逐位PASS+探针三件绿）

game/presentation/main.gd

@@ -447,7 +447,7 @@ func _start_adventure() -> void:
 	# 永久强化注入（元进度实现批）：冒险开始参数面——meta 现算 override 显式传参（全零 = 白板）
 	# 首次冒险脚本（关卡节点图生成 v0.4）：存档布尔位 false = 全关固定模板 0（教学重放）；置位后逐关抽签
 	var first_script: bool = not save_manager.is_first_adventure_done()
-	if not adventure.start_adventure(seed_val, {"hero_override": meta.hero_override() if meta != null else {}, "first_script": first_script, "aux_unlocked": _aux.unlocked_set()}):
+	if not adventure.start_adventure(seed_val, {"hero_override": meta.hero_override() if meta != null else {}, "first_script": first_script, "aux_unlocked": _aux.unlocked_set(), "shop_mode": "pool"}):
 		_fatal_screen("冒险启动失败——见输出日志")
 		return
 
@@ -496,10 +496,14 @@ func _on_runner_node(node: Dictionary, info: Dictionary) -> void:
 		node_overlay.show_rest(healed, int(info.get("hp", 0)), int(info.get("max_hp", 0)))
 		log_view.append_bb(Narrator.rest_line(healed, int(info.get("hp", 0)), int(info.get("max_hp", 0))))
 	elif t == "shop":
-		# 商店房兑付（GP+商店房实施批）：到达即开店——商品快照/余额经 runner 只读投影喂入；
-		# 购买/离开归玩家意图（buy_requested/leave_pressed 接线），零自动推进
+		# 商店房兑付（GP+商店房实施批）：到达即开店——商品/货架快照与余额经 runner 只读投影喂入；
+		# 购买/离开归玩家意图（buy_requested/leave_pressed 接线），零自动推进。
+		# pool 面 = 共享池货架三选一同构卡（迭代 11 第②批 T4）；legacy 面 = 固定三件（off 对照承载）
 		_open_modal(shop_overlay)
-		shop_overlay.open_shop(runner.shop_products(), int(runner.gp))
+		if runner.is_shop_pool():
+			shop_overlay.open_shelf(runner.shop_shelf(), int(runner.gp))
+		else:
+			shop_overlay.open_shop(runner.shop_products(), int(runner.gp))
 		log_view.append_bb(Narrator.shop_line(int(runner.gp)))
 	logger.log_node(node, info, runner.node_index)
 	_refresh_presentations()
@@ -1084,6 +1088,15 @@ func _on_camp_attune_toggle(item_id: String) -> void:
 func _on_shop_buy(product_id: String) -> void:
 	if runner == null:
 		return
+	if runner.is_shop_pool():
+		# pool 面：买 1 → 核心全重抽——货架整架重投喂（重抽反馈；余额不足核心拒绝零副作用）
+		if not runner.buy_pool_item(product_id):
+			logger.log_ux("ux_reject", {"source": "wallet", "sub_reason": "insufficient_gp"})
+			board_zone.toast.show_toast("金币不足——买不起这件商品", "warn")
+			return
+		shop_overlay.open_shelf(runner.shop_shelf(), int(runner.gp))
+		_refresh_presentations()
+		return
 	if not runner.buy_product(product_id):
 		# 余额不足（按钮禁用为常态防线——兜底拒绝可见，pattern 1）
 		logger.log_ux("ux_reject", {"source": "wallet", "sub_reason": "insufficient_gp"})
@@ -1107,7 +1120,10 @@ func _on_wallet_changed(event: String, gp: int, extra: Dictionary) -> void:
 	if String(event) == "gain":
 		_last_gain_amount = int(extra.get("amount", 0))   # 卡⑥ GP 增量取数（每战恰一笔 gain）
 	if shop_overlay.visible and runner != null:
-		shop_overlay.refresh_state(runner.shop_products(), int(runner.gp))
+		if runner.is_shop_pool():
+			shop_overlay.refresh_shelf_state(int(runner.gp))   # pool 面余额联动（货架内容仅买后重抽变）
+		else:
+			shop_overlay.refresh_state(runner.shop_products(), int(runner.gp))
 	_refresh_presentations()