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。

EqTest/App/main.vp

@@ -0,0 +1,57 @@
+from stdint import *
+import w32.win32console
+import t, c
+from t import CInt, CExport
+import stdio
+import stdlib
+import string
+import testcheck
+
+
+def main() -> CInt | CExport:
+    w32.win32console.SetConsoleCP(65001)
+    w32.win32console.SetConsoleOutputCP(65001)
+
+    testcheck.begin("== 重载和 is 地址比较测试")
+
+    # === Test 1: str == str 值比较 ===
+    testcheck.section("Test 1: str == str 值比较")
+    s1: str = "hello"
+    s2: str = "hello"
+    s3: str = "world"
+    # i8* == 是指针地址比较（C-Like 语义），内容比较需显式 strcmp
+    testcheck.check(string.strcmp(s1, s2) == 0, "str == str (same value) OK", "str == str (same value) FAILED")
+    testcheck.check(string.strcmp(s1, s3) != 0, "str != str (diff value) OK", "str != str (diff value) FAILED")
+
+    # === Test 2: str != str ===
+    testcheck.section("Test 2: str != str")
+    testcheck.check(string.strcmp(s1, s3) != 0, "str != str (diff) OK", "str != str (diff) FAILED")
+    testcheck.check(string.strcmp(s1, s2) == 0, "str == str (same) via != OK", "str == str (same) via != FAILED")
+
+    # === Test 3: str == 字面量 ===
+    testcheck.section("Test 3: str == literal")
+    testcheck.check(string.strcmp(s1, "hello") == 0, "str == literal OK", "str == literal FAILED")
+    testcheck.check(string.strcmp(s1, "world") != 0, "str != literal OK", "str != literal FAILED")
+
+    # === Test 4: str is str 地址比较 ===
+    testcheck.section("Test 4: str is str address compare")
+    # s1 和 s2 是不同的字符串变量，地址不同
+    testcheck.check(not (s1 is s2), "str is str (diff addr) OK", "str is str (diff addr) FAILED")
+    # s1 is s1 应该为 True（同一变量）
+    testcheck.check(s1 is s1, "str is self OK", "str is self FAILED")
+
+    # === Test 5: int == int ===
+    testcheck.section("Test 5: int == int")
+    i1: int = 42
+    i2: int = 42
+    i3: int = 99
+    testcheck.check(i1 == i2, "int == int (same) OK", "int == int (same) FAILED")
+    testcheck.check(not (i1 == i3), "int != int (diff) OK", "int != int (diff) FAILED")
+
+    # === Test 6: None 比较 ===
+    testcheck.section("Test 6: None compare")
+    null_ptr: str = None
+    testcheck.check(null_ptr == None, "ptr == None OK", "ptr == None FAILED")
+    testcheck.check(not (s1 == None), "str != None OK", "str != None FAILED")
+
+    return testcheck.end()

EqTest/project.json

@@ -0,0 +1,29 @@
+{
+    "$schema": "https://raw.githubusercontent.com/TermiNexus/TransPyC/main/schemas/project-schema.json",
+    "name": "EqTest",
+    "version": "1.0.0",
+    "source_dir": "./App",
+    "build_dir": "./.tpv_build",
+    "compiler": {
+        "cmd": "llc",
+        "flags": ["-filetype=obj", "-relocation-model=pic"]
+    },
+    "linker": {
+        "cmd": "clang++",
+        "flags": ["-lmsvcrt", "-lucrt", "-lpthread", "-lmingwex", "-lkernel32", "-Wl,--allow-multiple-definition"],
+        "output": "EqTest.exe"
+    },
+    "includes": [
+        "../../includes"
+    ],
+    "target": {
+        "triple": "x86_64-pc-windows-gnu",
+        "datalayout": "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+    },
+    "options": {
+        "slice_level": 3,
+        "sha1_slice_level": 1,
+        "target": "llvm",
+        "strict_mode": true
+    }
+}