chore(test): 迁移测试夹具到新语法

机械规则 R2/R3/R4/R6/R7/R8/R13 + R16 保守子集，共 86 文件 2127 行。R1（T | t.CPtr）与 R12（while 下标循环）未做，仍列为待办。全量 77/77 顺序回归通过。

G7/App/main.vp

@@ -38,15 +38,15 @@ def test_value_struct_fields():
     node.IntVal = 42
     node.FloatVal = 3.14
     # 读取验证
-    v: t.CInt = node.IntVal
+    v: int = node.IntVal
     testcheck.check(v == 42, "Value.IntVal = 42", "expect 42")
-    f: t.CDouble = node.FloatVal
+    f: double = node.FloatVal
     testcheck.check(f > 3.0 and f < 4.0, "Value.FloatVal = 3.14", "expect ~3.14")
-    c: t.CInt = node.IsConst
+    c: int = node.IsConst
     testcheck.check(c == 1, "Value.IsConst = 1", "expect 1")
 
 
-def main() -> t.CInt:
+def main() -> int:
     testcheck.begin("G7: Minimal repro - class name 'Value' conflicts with variable")
     test_value_struct_fields()
     return testcheck.end()

G7/includes/conflict_node.vp

@@ -17,9 +17,9 @@ from linkedlist import GSListNode
 class Value(GSListNode[Value]):
     Ty: t.CPtr
     Name: t.CPtr
-    IsConst: t.CInt
-    IntVal: t.CInt64T
-    FloatVal: t.CDouble
+    IsConst: int
+    IntVal: int64
+    FloatVal: double
 
     def __init__(self):
         self.Ty = None