Function index_budgeted 

pub fn index_budgeted(
    store: &mut Store,
    root: &Path,
    active: &[String],
    budget: Duration,
    query: Option<&str>,
) -> Result<Stats, Box<dyn Error>>

Opportunistic, time-bounded indexing — warm the index a little per call so no single query blocks on a full walk of a large repo. active (branch) files are parsed first and ignore the budget (the working set stays fresh); then the walk streams the rest, honoring budget. When query is set, files whose path matches it are parsed first (a cheap, in-memory reorder of the candidate list — no file reads), so a relevant symbol indexes fast. A sweep that finishes within budget marks coverage complete, else warming.