Function run_new_code_scope 

pub fn run_new_code_scope<R: Repo>(
    db: &FactsDb,
    repo: &R,
    opts: &Options,
    window_days: u32,
    health: &[CodeHealthRow],
) -> Result<NewCodeScope>

Compute the NewCodeScope for window_days against the fact store.

health must be the HEAD-scope, unlimited-row code-health rows (as the gate path already computes for code_health_min): its scores feed the born band, and its path set is the live-at-HEAD source universe that scopes both bands. Reusing it means no second health scan — the born band is a pure lookup and the touched band adds only the scoped window-start parse shared with the effort decomposition.

Errors

Returns crate::CodeLoreError::Analysis on SQL or row-mapping failure, or any error from the shared window-start scan.