feat(卡② T7-V10): static_scan 新增 S12 旧件零残留扫描 + 清尽注释内旧符号

- S12 扫 game/ 全域 .gd/.tres（改名与旧符号同存数据行/测试/smoke，非仅 core）：
  counters_export/counters_seed/counters_merge_export/counters_seed_snapshot/_reset_tree_limited_counters
  + 带引号旧 id "tree_sense_*"/"twin_digs"/"instinct_atk"（引号锚定不误伤新名）零命中
- 非空扫描面自检（185 文件）；注入 counters_export 见红、还原回绿（变异验证取证）
- 迁移注释措辞去除旧符号字面、feat_vouchers V16 写键 twin_digs→adv_twin_digs
编号说明：卡① 已占 S11（代码注释禁用词），本扫描落 S12（卡片成文时 S11 未定义，属卡片与现实偏差，归反哺点）。

game/tests/unit/core/effect_words_t1_test.gd

@@ -87,12 +87,12 @@ func _init() -> void:
 			if String(h.get("kind", "")) == "counter_add":
 				EffectEngine.counter_add(ctx3, String(h.get("counter_id", "")), int(h.get("value", 0)))
 	Kit.check_quiet(EffectEngine.counter(ctx3, "adv_persist") == 2 and int(adv_bucket.get("adv_persist", -1)) == 2,
-		"adventure 桶就地直写共享字典累积=2（adv_ 前缀归 adventure 桶——替代旧 counters_export）〔专长批 V1〕")
+		"adventure 桶就地直写共享字典累积=2（adv_ 前缀归 adventure 桶——替代旧导出搬运）〔专长批 V1〕")
 	var fx4 = EffectEngineScript.new(null)
 	fx4._push_trigger("test", "adv_row2", {"on": "mine_hit",
 		"do": {"kind": "counter_add", "counter_id": "adv_persist", "value": 1}}, {})
 	var ctx4 := EffectContext.new()
-	ctx4.adventure_bucket = adv_bucket   # 挂同一字典引用=下一战可读上一战持久值（替代旧 counters_seed 回灌）
+	ctx4.adventure_bucket = adv_bucket   # 挂同一字典引用=下一战可读上一战持久值（替代旧回灌）
 	Kit.check_quiet(EffectEngine.counter(ctx4, "adv_persist") == 2,
 		"adventure 桶共享引用跨引擎可读（无 export/seed，同字典即跨战持久）〔专长批 V1〕")
 

game/tests/unit/core/feat_vouchers_test.gd

@@ -111,7 +111,7 @@ func _init() -> void:
 	# V16——断点扩容往返：新账本随断点快照/续玩回填（breakpoint_resume_test P5 同构）
 	var sm = load("res://core/save_manager.gd").new("user://_feat_vouchers_bp.json")
 	sm.load_from_disk()
-	a.run_ledger.adventure_counters = {"pain_layers": 3, "twin_digs": 5}   # 四账住 RunLedger
+	a.run_ledger.adventure_counters = {"pain_layers": 3, "adv_twin_digs": 5}   # 四账住 RunLedger
 	a._refresh_stock = 2
 	a.set_save_manager(sm)
 	a._on_level_finished({"result": "victory", "hp": 10, "node_index": 1, "node_id": 1, "node_type": "shop"})