chore(test): 初始化回归测试仓（新增 .gitignore，TestsOverview.md 改为 README.md）

把 Test/ 纳入 https://git.gvsds.com/GVSDS/Viper_RegressionTesting 。

1) 新增 .gitignore —— 只保留测试源码，剔除全部构建产物：
   目录   **/output*/（output / output_opt / output_orig / output_verify / output_dbg）、
          **/temp*/（temp / temp_opt）、**/.tpv_build/
   二进制 *.exe *.obj *.o *.out *.a *.lib *.dll
   中间物 *.ll *.vpi *.pyi *.deps.txt *.deps.json *.doc.json *_sha1_map.txt
          _pyi_cache_v1.pkl _pyi_cache_v1.sig.json _shared_sym.json _phase1_manifest.json
   其它   build_all.txt（构建日志）、*.log、__pycache__/、*.bak、IDE 目录
   保留   App/*.vp、project.json / project_opt.json / project.vpj、README.md、两个 .py
   实测 `git add -A --dry-run`：196 个文件，无任何构建产物混入。

2) TestsOverview.md → README.md（作为仓库首页文档）。

3) SequentialRegressionTest.py：7 处 TestsOverview.md 引用同步改为 README.md
   （文档串、OVERVIEW 路径、read_test_order 文档与报错文案、argparse description、
   启动横幅）；同时修正入口路径 PROJECTRANS —— 旧值 <root>/Projectrans.py 已不存在，
   改为 <root>/TransPyC/Projectrans.py（与 regression_test.py:45-48 记录一致），
   否则本脚本会以 "can't open file" 全量失败。
   regression_test.py 无需改动：它按目录扫描 project.json 找项目，不引用该文档。

IsinstanceTest/App/geom_lib.vp

@@ -0,0 +1,43 @@
+import t
+from t import CInt
+
+
+# ============================================================
+# 跨模块 isinstance 测试库
+#
+# 供 main.vp import 使用：验证 isinstance 对"定义在其他模块
+# 的类"也能正确比较（对象 vtable 指针跨 obj 链接解析）。
+# ============================================================
+
+
+@t.CVTable
+class Shape:
+    def area(self) -> CInt:
+        return 0
+
+
+@t.CVTable
+class Circle(Shape):
+    r: CInt
+
+    def __init__(self, r: CInt):
+        self.r = r
+
+    def area(self) -> CInt:
+        return self.r
+
+
+@t.CVTable
+class Square(Shape):
+    s: CInt
+
+    def __init__(self, s: CInt):
+        self.s = s
+
+    def area(self) -> CInt:
+        return self.s
+
+
+@t.NoVTable
+class PlainShape:
+    tag: CInt

IsinstanceTest/App/main.vp

@@ -0,0 +1,153 @@
+from stdint import *
+import t, c
+import testcheck
+import geom_lib
+from t import CInt, CPtr, CExport
+
+
+# ============================================================
+# isinstance 内建函数测试（运行时 vtable 继承链比较）
+#
+# 场景覆盖：
+#   1. CVTable 自身/子类→基类
+#   2. 运行时多态（基类指针指向子类对象）
+#   3. 元组 (A, B)
+#   4. 多继承（AB 同时是 A 和 B 的实例）
+#   5. NoVTable 类（编译时静态判断）
+# ============================================================
+
+
+# ========== CVTable 继承 ==========
+
+@t.CVTable
+class Animal:
+    Name: str
+
+    def __init__(self, name: str):
+        self.Name = name
+
+    def speak(self) -> str:
+        return "..."
+
+
+@t.CVTable
+class Dog(Animal):
+    def __init__(self, name: str):
+        self.Name = name
+
+    def speak(self) -> str:
+        return "Woof"
+
+
+@t.CVTable
+class Cat(Animal):
+    def speak(self) -> str:
+        return "Meow"
+
+
+# ========== 多继承 ==========
+
+@t.CVTable
+class A:
+    a: CInt
+
+    def get_a(self) -> CInt:
+        return self.a
+
+
+@t.CVTable
+class B:
+    b: CInt
+
+    def get_b(self) -> CInt:
+        return self.b
+
+
+@t.CVTable
+class AB(A, B):
+    def __init__(self, a: CInt, b: CInt):
+        self.a = a
+        self.b = b
+
+
+# ========== NoVTable（编译时判断） ==========
+
+@t.NoVTable
+class Plain:
+    v: CInt
+
+
+def main() -> CInt | CExport:
+    testcheck.begin("IsinstanceTest: isinstance 内建函数测试")
+
+    # --- 1. 自身类型 + 子类→基类 ---
+    d: Dog | CPtr = Dog("dog")
+    testcheck.check(isinstance(d, Dog) == 1, "isinstance(d, Dog) 自身 OK",
+                    "isinstance(d, Dog) FAILED")
+    testcheck.check(isinstance(d, Animal) == 1, "isinstance(d, Animal) 子类→基类 OK",
+                    "isinstance(d, Animal) FAILED")
+    testcheck.check(isinstance(d, Cat) == 0, "isinstance(d, Cat) 不匹配 OK",
+                    "isinstance(d, Cat) FAILED")
+
+    # --- 2. 运行时多态：基类指针指向子类对象 ---
+    a: Animal | CPtr = (Animal | CPtr)(d)
+    testcheck.check(isinstance(a, Dog) == 1,
+                    "isinstance(Animal*, Dog 对象) 运行时多态 OK",
+                    "isinstance(Animal*, Dog) FAILED")
+    testcheck.check(isinstance(a, Animal) == 1,
+                    "isinstance(Animal*, Animal) 基类自身 OK",
+                    "isinstance(Animal*, Animal) FAILED")
+    testcheck.check(isinstance(a, Cat) == 0,
+                    "isinstance(Animal*, Cat) 运行时 False OK",
+                    "isinstance(Animal*, Cat) FAILED")
+
+    # --- 3. 元组 ---
+    testcheck.check(isinstance(d, (Cat, Dog)) == 1, "isinstance 元组命中 OK",
+                    "isinstance 元组 FAILED")
+    testcheck.check(isinstance(d, (Cat, A)) == 0, "isinstance 元组未命中 OK",
+                    "isinstance 元组未命中 FAILED")
+
+    # --- 4. 多继承 ---
+    ab: AB | CPtr = AB(1, 2)
+    testcheck.check(isinstance(ab, A) == 1, "isinstance(AB, A) 多继承 OK",
+                    "isinstance(AB, A) FAILED")
+    testcheck.check(isinstance(ab, B) == 1, "isinstance(AB, B) 多继承 OK",
+                    "isinstance(AB, B) FAILED")
+    testcheck.check(isinstance(ab, Animal) == 0, "isinstance(AB, Animal) False OK",
+                    "isinstance(AB, Animal) FAILED")
+    testcheck.check(ab.get_a() == 1 and ab.get_b() == 2, "AB 字段/方法正常 OK",
+                    "AB 字段/方法 FAILED")
+
+    # --- 5. NoVTable（编译时静态判断） ---
+    p: Plain | CPtr = Plain()
+    p.v = 42
+    testcheck.check(isinstance(p, Plain) == 1, "isinstance NoVTable 编译时 OK",
+                    "isinstance NoVTable FAILED")
+    testcheck.check(p.v == 42, "NoVTable 字段正常 OK", "NoVTable 字段 FAILED")
+
+    # --- 6. 跨模块 isinstance（vtable 跨 obj 链接解析） ---
+    cc: geom_lib.Circle | CPtr = geom_lib.Circle(5)
+    testcheck.check(isinstance(cc, geom_lib.Circle) == 1,
+                    "跨模块 isinstance 自身 OK", "跨模块 isinstance 自身 FAILED")
+    testcheck.check(isinstance(cc, geom_lib.Shape) == 1,
+                    "跨模块 isinstance 子类→基类 OK", "跨模块 isinstance 子类→基类 FAILED")
+    testcheck.check(isinstance(cc, geom_lib.Square) == 0,
+                    "跨模块 isinstance 不匹配 OK", "跨模块 isinstance 不匹配 FAILED")
+    sq: geom_lib.Square | CPtr = geom_lib.Square(3)
+    testcheck.check(isinstance(sq, geom_lib.Shape) == 1,
+                    "跨模块 Square→Shape OK", "跨模块 Square→Shape FAILED")
+    testcheck.check(isinstance(sq, geom_lib.Circle) == 0,
+                    "跨模块 Square vs Circle OK", "跨模块 Square vs Circle FAILED")
+    shp: geom_lib.Shape | CPtr = (geom_lib.Shape | CPtr)(cc)
+    testcheck.check(isinstance(shp, geom_lib.Circle) == 1,
+                    "跨模块运行时多态 OK", "跨模块运行时多态 FAILED")
+    testcheck.check(shp.area() == 5, "跨模块虚方法分派 OK", "跨模块虚方法分派 FAILED")
+    testcheck.check(cc.area() == 5, "跨模块 Circle.area OK", "跨模块 Circle.area FAILED")
+
+    # --- 7. NoVTable 跨模块静态判断 ---
+    ps: geom_lib.PlainShape | CPtr = geom_lib.PlainShape()
+    testcheck.check(isinstance(ps, geom_lib.PlainShape) == 1,
+                    "跨模块 NoVTable 静态 OK", "跨模块 NoVTable 静态 FAILED")
+
+    testcheck.ok("isinstance 全部测试完成")
+    return testcheck.end()

IsinstanceTest/project.json

@@ -0,0 +1,40 @@
+{
+    "$schema": "https://raw.githubusercontent.com/TermiNexus/TransPyC/main/schemas/project-schema.json",
+    "name": "IsinstanceTest",
+    "version": "1.0.0",
+    "source_dir": "./App",
+    "build_dir": "./.tpv_build",
+    "compiler": {
+        "cmd": "llc",
+        "flags": [
+            "-filetype=obj",
+            "-relocation-model=pic"
+        ]
+    },
+    "linker": {
+        "cmd": "clang++",
+        "flags": [
+            "-Wl,--allow-multiple-definition",
+            "-lmsvcrt",
+            "-lucrt",
+            "-lpthread",
+            "-lmingwex",
+            "-lkernel32",
+            "-luser32"
+        ],
+        "output": "IsinstanceTest.exe"
+    },
+    "includes": [
+        "../../includes"
+    ],
+    "target": {
+        "triple": "x86_64-pc-windows-gnu",
+        "datalayout": "e-m:w-p270:32:32-p271:32:32-p272:64:64-f80:128-n8:16:32:64-S128"
+    },
+    "options": {
+        "slice_level": 3,
+        "sha1_slice_level": 1,
+        "target": "llvm",
+        "strict_mode": true
+    }
+}