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。

RawArrayTest/App/main.vp

@@ -0,0 +1,45 @@
+import t, c
+from stdint import *
+import stdio
+
+
+# 模块级全局定长数组（rawarray 复刻 t.CArray）
+g_arr: rawarray[t.CInt, 4] = [10, 20, 30, 40]
+
+
+# struct 内嵌定长数组字段
+class Ctx:
+    state: rawarray[uint32, 5]
+    buf: rawarray[uint8, 64]
+
+
+def main() -> t.CInt | t.CExport:
+    # 1) 全局数组读取
+    stdio.printf("1 g_arr[0]=%d g_arr[3]=%d (expect 10 40)\n", g_arr[0], g_arr[3])
+
+    # 2) 局部定长数组（写 + 读）
+    loc: rawarray[uint32, 3] = [0, 0, 0]
+    loc[1] = 7
+    stdio.printf("2 loc[1]=%d (expect 7)\n", loc[1])
+
+    # 3) struct 内嵌数组字段
+    ctx: Ctx
+    ctx.state[0] = 100
+    ctx.state[4] = 400
+    ctx.buf[0] = 65
+    stdio.printf("3 ctx.state[0]=%d ctx.state[4]=%d ctx.buf[0]=%d (expect 100 400 65)\n",
+                 ctx.state[0], ctx.state[4], int(ctx.buf[0]))
+
+    # 4) 参数数组衰减（CArray 形参 → 元素指针）+ sizeof
+    total: int = sum_arr(loc, 3)
+    stdio.printf("4 sum=%d (expect 7)\n", total)
+
+    return 0
+
+
+def sum_arr(vals: rawarray[uint32, 3], n: int) -> int:
+    s: int = 0
+    i: int
+    for i in range(n):
+        s = s + int(vals[i])
+    return s

RawArrayTest/project.json

@@ -0,0 +1,40 @@
+{
+    "$schema": "https://raw.githubusercontent.com/TermiNexus/TransPyC/main/schemas/project-schema.json",
+    "name": "RawArrayTest",
+    "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": "RawArrayTest.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
+    }
+}