Function parse 

pub fn parse(path: &str) -> Result<Vec<Segment>, NikaError>

Parse a simple JSONPath string into segments.

Supports:

• $.a.b.c (dot notation with $ prefix)
• a.b.c (dot notation without prefix)
• items[0].name (array index in bracket notation)
• items.0.name (array index as numeric segment)

Does NOT support wildcards, filters, slices, or recursive descent. Use query() for those.