Nested lists not working

I would like to have nested lists. I cannot get them to work. I tried various "styles" (e.g., 2 spaces, 4 spaces). See example below.

## Example

**Markdown input**
```
* Fruit
* Apple
* Orange
* Milk
* Cheese
```

**Expected output**
```

• Fruit
  
  
  
  • Apple
  
  
  • Orange
  
  
  
  


• Milk
  
  
  
  • Cheese
  
  
  
  

```

**Actual output**
```

• Fruit

Apple
Orange

• Milk

Cheese
```

## Context

snarkdown 2.0.0

Start by reproducing the nested-list Markdown example from the issue against snarkdown 2.0.0, then locate the parser entry point that handles list markers and indentation. Compare the generated HTML with the expected output; done means nested list items produce nested

elements rather than emphasis or plain text.

索引モデルが issue の本文から書いたものです。