Function plan_reconcile 

pub(crate) fn plan_reconcile(
    browser_status: &HashMap<String, HwndStatus>,
    all_browser_labels: &[String],
    shadow_keys: &HashSet<String>,
    pool_queue: &HashSet<String>,
    unpromoted_pool: &HashSet<String>,
    pending_creation_in_flight: bool,
) -> ReconcilePlan

Pure planning function. The orchestrator HWND-probes every non-pane top-level browser in state.browsers and feeds that map here.

browser_status keys every non-pane label in state.browsers to its HwndStatus. Includes pool-prefixed labels AND regular top-level windows (e.g. main, window-N). Pane labels (browser-pane-*) are NOT in this map — they drain via a separate cascade and would otherwise pollute classification.

all_browser_labels is state.list_browsers() keyed; used only for live_user_count.