Export Document Renders Nothing

### Which OS are you using?

Linux

### Expected Behaviour

"Lua: Export Document" -> Should generate markdown files after choosing the output folder.

### Actual Behaviour

Nothing renders

### Reproduction steps

1. Open a lua file
2. press `ctl + shift + p`
3. select "Lua: Export Document"
4. choose a folder

no output generated.

### Additional Notes

- This may be user error, if so, no notification provided by the extension.
- I'm using LuaJIT as the interpreter.

### Log

```
script/cli/doc.lua:287: bad argument #1 to 'path' (bee::path expected, got nil)
stack traceback:
[C]: in function 'bee.filesystem.path'
script/cli/doc.lua:287: in upvalue 'collectConfig'
script/cli/doc.lua:300: in function 'cli.doc.export'
script/cli/doc.lua:354: in function 'cli.doc.makeDoc'
script/core/command/exportDocument.lua:11: in function 'core.command.exportDocument'
script/provider/provider.lua:984: in function
[C]: in function 'xpcall'
script/proto/proto.lua:200: in function <script/proto/proto.lua:175>
```

Start with script/cli/doc.lua around collectConfig at line 287 and the export path in script/cli/doc.lua, then follow script/core/command/exportDocument.lua:11. Reproduce the documented command sequence with LuaJIT and use the stack trace to inspect why export produces no files. Done means the selected folder receives markdown output, or the extension reports a clear configuration error.

Written by the indexing model from the issue text.