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。

DefaultArgTest/App/main.vp

@@ -6,7 +6,7 @@ import random
 
 
 # 同模块：单个尾随默认值
-def local_one(x: int, cap: t.CSizeT = 4096) -> t.CSizeT:
+def local_one(x: int, cap: sizet = 4096) -> sizet:
     return cap
 
 
@@ -15,35 +15,35 @@ def local_quad(a: int, b: int = 10, c: int = 20, d: int = 30) -> int:
     return a + b * 100 + c * 10000 + d * 1000000
 
 
-def main() -> t.CInt:
+def main() -> int:
     testcheck.begin("DefaultArgTest: default / named / out-of-order arguments")
 
     # ① 同模块默认值
     testcheck.section("same-module defaults")
-    r1: t.CSizeT = local_one(1)
+    r1: sizet = local_one(1)
     testcheck.check(r1 == 4096, "local_one(1) cap = 4096", "local_one(1) cap != 4096")
     r2: int = local_quad(1)
     testcheck.check(r2 == 30201001, "local_quad(1) = 30201001", "local_quad(1) != 30201001")
 
     # ② 跨模块默认值
     testcheck.section("cross-module defaults")
-    r3: t.CSizeT = remote.one(1)
+    r3: sizet = remote.one(1)
     testcheck.check(r3 == 4096, "remote.one(1) cap = 4096", "remote.one(1) cap != 4096")
-    r4: t.CSizeT = remote.write(1, 2, False)
+    r4: sizet = remote.write(1, 2, False)
     testcheck.check(r4 == 4096, "remote.write(1,2,False) cap = 4096", "remote.write(1,2,False) cap != 4096")
 
     # ③ 显式覆盖默认值
     testcheck.section("explicit override")
-    r5: t.CSizeT = remote.one(1, 8)
+    r5: sizet = remote.one(1, 8)
     testcheck.check(r5 == 8, "remote.one(1,8) cap = 8", "remote.one(1,8) cap != 8")
 
     # ④ 命名 / 乱序传参
     testcheck.section("named / out-of-order arguments")
-    r6: t.CSizeT = remote.one(cap = 8, x = 1)
+    r6: sizet = remote.one(cap = 8, x = 1)
     testcheck.check(r6 == 8, "remote.one(cap = 8, x = 1) = 8", "remote.one(cap = 8, x = 1) != 8")
-    r7: t.CSizeT = remote.one(x = 1, cap = 8)
+    r7: sizet = remote.one(x = 1, cap = 8)
     testcheck.check(r7 == 8, "remote.one(x = 1, cap = 8) = 8", "remote.one(x = 1, cap = 8) != 8")
-    r8: t.CSizeT = remote.one(x = 1)
+    r8: sizet = remote.one(x = 1)
     testcheck.check(r8 == 4096, "remote.one(x = 1) cap = 4096", "remote.one(x = 1) cap != 4096")
     r9: int = remote.many(z = 3, x = 1, y = 2)
     testcheck.check(r9 == 9, "remote.many(z = 3, x = 1, y = 2) = 9", "remote.many(z = 3, x = 1, y = 2) != 9")
@@ -64,7 +64,7 @@ def main() -> t.CInt:
     # ⑥ include 模块（顶层 .vp）默认值：vrandom.randrange(start, stop, step = 1)
     # stop-start==1 ⇒ width==1 ⇒ 结果恒为 start；step 未填充时会退化为 0/垃圾
     testcheck.section("include-module defaults")
-    r15: t.CInt = random.randrange(5, 6)
+    r15: int = random.randrange(5, 6)
     testcheck.check(r15 == 5, "vrandom.randrange(5,6) = 5 (step default)", "vrandom.randrange(5,6) != 5")
 
     return testcheck.end()

DefaultArgTest/App/remote.vp

@@ -2,12 +2,12 @@ import t
 
 
 # 跨模块：单个尾随默认值（对照 includes/json/__writer.vp 的 write 形态）
-def one(x: int, cap: t.CSizeT = 4096) -> t.CSizeT:
+def one(x: int, cap: sizet = 4096) -> sizet:
     return cap
 
 
 # 跨模块：4 参、最后一个有默认值（与 json.write(pool, val, pretty, cap=4096) 同形）
-def write(a: int, b: int, pretty: bool, cap: t.CSizeT = 4096) -> t.CSizeT:
+def write(a: int, b: int, pretty: bool, cap: sizet = 4096) -> sizet:
     return cap