Function forget_decision_with_database 

pub fn forget_decision_with_database(
    database: &Database,
    hash: &str,
) -> Result<Decision, CliError>

Resolve and hard-delete a decision by hash or prefix, returning the removed Decision. Public seam for the integration test (tests/decisions_forget.rs) that exercises the full “scan → confirm → forget → rescan re-emits” flow without involving stdin.

This bypasses both project resolution and the interactive prompt: the caller supplies an already-open Database, and the helper performs the same resolve-then-delete sequence the --yes path uses.