Function parse 

pub fn parse(
    filename: &str,
    root: Value,
    dynamic: &mut DynamicPool,
    keys: &mut Vec<u64>,
    values: &mut Vec<[u64; 2]>,
    path_map: &mut Vec<Vec<u16>>,
    children_map: &mut Vec<Vec<u16>>,
) -> Result<ParsedManifest, String>

Parses a manifest value tree, appending into caller-owned vecs. Returns a ParsedManifest referencing the file root record’s index.

• keys: Vec — fixed-bits key records
• values: Vec<[u64; 2]> — fixed-bits value records
• path_map: Vec<Vec> — path segment index sequences
• children_map: Vec<Vec> — multi-child index lists

Index 0 of each vec is reserved as null by the caller.