Function run_watch_with_polling_fallback 

fn run_watch_with_polling_fallback<F>(
    store: &mut AtlasStore,
    plan: &ScanRuntimePlan,
    poll_seconds: u64,
    max_cycles: usize,
    symbol_options: &SymbolBuildOptions,
    run_notify: F,
) -> Result<WatchReport, CliError>
where
    F: FnOnce(&mut AtlasStore) -> Result<WatchReport, CliError>,

Run an event-backed watcher and preserve current changes through polling fallback.