Function get_path_ref 

pub fn get_path_ref<'a>(
    root: &'a Value,
    path: &str,
    addressing: Addressing<'_>,
) -> DocumentResult<&'a Value>

Get a value at the given dot-path.

Handles:

• Object field access (any level of nesting)
• Named array access (keyed-list slug, or a format’s own array rule)
• Greedy key matching for keys containing ‘.’