Provide a more error-locating-friendly companion to `nbdev_export`：nbscholar_check（along with nbscholar_export） nbscholar_check：一个更易定位错误的 nbdev_export 伴侣

**Summary**
- When `nbdev_export` fails, it’s hard to pinpoint which `.ipynb` and line caused the error.
- 当 `nbdev_export` 报错时，往往难以快速定位到底是哪个 `.ipynb`、哪一行出错。

**What Is It**
- `nbscholar_check` performs strict Python AST checks per notebook and prints VSCode-clickable errors (`/abs/path.ipynb:line:column: SyntaxError: ...`).
- `nbscholar_export` acts as a drop-in companion to `nbdev_export`: on failure, it guides you to run `nbscholar_check` for fast pinpointing.
- `nbscholar_check` 对每个笔记本进行严格的 Python AST 校验，并以 VSCode 可点击格式输出错误（`/abs/path.ipynb:line:column: SyntaxError: ...`）。
- `nbscholar_export` 是 `nbdev_export` 的伴侣：失败时提示使用 `nbscholar_check` 快速定位问题。

**Why It Helps**
- Export cells are enforced with strict AST (cells starting with `#| export` / `#| exporti`); non-export cells tolerate common IPython syntax (`%%`, `%`, `?`/`??`) to avoid false positives.
- Errors show as clickable links in VSCode’s terminal, taking you directly to the file, line, and column.
- 对导出单元（以 `#| export` / `#| exporti` 开头）严格 AST；普通单元兼容 IPython 常见语法，减少误报。
- VSCode 终端中以可点击链接展示错误，直达文件、行列位置，定位更高效。

**Quick Start**
- Install
```bash
pip install git+https://github.com/THU-CVML/ScholarlyInfrastructure.git
```
- Check a file or directory
```bash
nbscholar_check .
```
- Export companion (same usage as nbdev_export)
```bash
nbscholar_export
```
- 安装
```bash
pip install git+https://github.com/THU-CVML/ScholarlyInfrastructure.git
```
- 检查单个文件或整目录
```bash
nbscholar_check .
```
- 作为导出伴侣（与 nbdev_export 用法一致）
```bash
nbscholar_export
```

**Example Output**
- `/absolute/path/to/notebooks/03_nbscholar (nbdev extensions).ipynb:123:7: SyntaxError: invalid syntax (cell 5)`
- 点击该链接即可在 VSCode 中打开对应 `.ipynb` 并跳到相应行列。
- 在 VSCode 终端中点击即可直达错误位置与上下文。

**Call To Action**
- Try `nbscholar_check` / `nbscholar_export` and share feedback: `https://github.com/THU-CVML/ScholarlyInfrastructure.git`
- If this improves your export and debugging workflow, please give us a Star!
- 欢迎试用并反馈：`https://github.com/THU-CVML/ScholarlyInfrastructure.git`
- 如果觉得好用，欢迎点 Star 支持我们！