The meeting-stone query runs at every world entry, as 1.12.1 sends it (#810)

The meeting-stone status query (`CMSG 0x296`) and its text reset ran once per UI VM, and the text drop only on leaving the world. So after a cross-map worldport benilla kept the old text and never asked again.

In 1.12.1 the world-enter cascade's meeting-stone init (`0x490a14` → `0x4c9f40`) resets the text to `UNKNOWN` and sends `0x296`, right after the battlefield init, on every pass: login, every cross-map worldport and every `/reload`. The leave-world sweep `0x490a80` drops the text (`0x490b2f` → `0x4c9f80`) on a worldport, a `/reload` and leaving the world.

The enter leg now runs on the world-enter cascade after the battlefield status. The sweep is one edge, written whenever its latch is spent, and the drop reads it. Tests cover the cascade, a worldport, a reload and the schedule order; a live trace shows `0x296` after `0x2D3` and its reply at login, on `ReloadUI()` and after `.tele`.

Fixes #99

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/benilla-app/src/ui_script/lifecycle.rs

@@ -480,14 +480,53 @@ pub(crate) fn seat_from_roster(
 pub(crate) struct AddOnIdentity(pub(crate) Option<(String, String)>);
 
 /// The world latch, the reference's `[0xb4b424]`: set at `0x4908ce` in the world-enter cascade
-/// `0x4908c0` and cleared at `0x490a8d` as `PLAYER_LEAVING_WORLD` fires (`0x490b4d`, its one
-/// site), so the first departure in a world fires and the rest are no-ops until the next entry.
-/// Ours has two producers, [`shutdown_ui_state`]'s tail and `ui_unit`'s worldport fire. A
+/// `0x4908c0` and cleared at `0x490a8d` by the leave-world sweep `0x490a80`, which then fires
+/// `PLAYER_LEAVING_WORLD` (`0x490b4d`, its one site), so the first departure in a world sweeps
+/// and the rest are no-ops until the next entry. Ours is spent through [`LeaveWorldSweep`] or
+/// [`run_leave_world_sweep`], by [`shutdown_ui_state`]'s roots and `ui_unit`'s worldport fire. A
 /// cross-map worldport spends it without leaving `InWorld`, so a quit on its loading screen
 /// fires nothing; a `/reload` fires, and its rebuild re-arms.
 #[derive(Resource, Default)]
 pub(crate) struct LeavingWorldArmed(bool);
 
+/// The leave-world sweep `0x490a80` ran past its latch: a cross-map worldport (the local
+/// player's destructor, `0x5dd543`), a `/reload` (`0x490c20`) or leaving the world. Its legs
+/// past the clear read this, as the meeting stone's text drop (`0x490b2f` → `0x4c9f80`) does; a
+/// same-map teleport destroys nothing and never sweeps.
+#[derive(Message)]
+pub(crate) struct WorldLeaveSweepMessage;
+
+/// The latch and the sweep it gates, for a system: spending one writes the other.
+#[derive(bevy::ecs::system::SystemParam)]
+pub(crate) struct LeaveWorldSweep<'w> {
+    armed: ResMut<'w, LeavingWorldArmed>,
+    sweeps: MessageWriter<'w, WorldLeaveSweepMessage>,
+}
+
+impl LeaveWorldSweep<'_> {
+    /// Run the sweep: `true`, and [`WorldLeaveSweepMessage`] written, at most once per world.
+    pub(crate) fn run(&mut self) -> bool {
+        let swept = self.armed.spend();
+        if swept {
+            self.sweeps.write(WorldLeaveSweepMessage);
+        }
+        swept
+    }
+}
+
+/// [`LeaveWorldSweep::run`] for an exclusive edge; no latch is no world to leave.
+pub(crate) fn run_leave_world_sweep(world: &mut World) -> bool {
+    let swept = world
+        .get_resource_mut::<LeavingWorldArmed>()
+        .is_some_and(|mut l| l.spend());
+    if swept {
+        if let Some(mut sweeps) = world.get_resource_mut::<Messages<WorldLeaveSweepMessage>>() {
+            sweeps.write(WorldLeaveSweepMessage);
+        }
+    }
+    swept
+}
+
 impl LeavingWorldArmed {
     /// A world began. Idempotent, like the reference's `mov byte [0xb4b424],1`.
     pub(crate) fn arm(&mut self) {
@@ -495,7 +534,7 @@ impl LeavingWorldArmed {
     }
 
     /// Take the one-shot: `true` at most once per world, `0x490a8d`'s clear folded in.
-    pub(crate) fn spend(&mut self) -> bool {
+    fn spend(&mut self) -> bool {
         std::mem::take(&mut self.0)
     }
 
@@ -561,9 +600,7 @@ pub(crate) fn end_ui_session(world: &mut World) {
         .get_resource::<AddOnIdentity>()
         .and_then(|id| id.0.clone());
     // Spent at the root: of this edge and the worldport's, the first to a departure owns it.
-    let leaving_world = world
-        .get_resource_mut::<LeavingWorldArmed>()
-        .is_some_and(|mut l| l.spend());
+    let leaving_world = run_leave_world_sweep(world);
     if !ui_never_loaded {
         if let Some(mut script) = world.get_non_send_resource_mut::<UiScript>() {
             shutdown_ui_state(&mut script, identity.as_ref(), leaving_world);
@@ -646,7 +683,7 @@ pub(crate) fn shutdown_on_exit(
     script: Option<NonSendMut<UiScript>>,
     id: Res<AddOnIdentity>,
     pending_entry: Option<Res<PendingEntryUiLoad>>,
-    mut armed: ResMut<LeavingWorldArmed>,
+    mut sweep: LeaveWorldSweep,
     mut exits: MessageReader<AppExit>,
 ) {
     if exits.read().next().is_none() {
@@ -656,7 +693,7 @@ pub(crate) fn shutdown_on_exit(
     if pending_entry.is_some() {
         return;
     }
-    let leaving_world = armed.spend();
+    let leaving_world = sweep.run();
     if let Some(mut script) = script {
         shutdown_ui_state(&mut script, id.0.as_ref(), leaving_world);
     }
@@ -847,29 +884,42 @@ mod tests {
         assert_eq!(*world.resource::<VPlateMode>(), on, "a reload keeps them");
     }
 
-    /// A `ReloadUI()` re-enters the world-enter cascade (`0x490168`), whose readers re-send the
-    /// time, mail and battlefield queries, only with the active player set (`0x490166 je`).
+    /// A `ReloadUI()` runs the leave-world sweep (`0x490c20`, past the armed latch) and then
+    /// re-enters the world-enter cascade (`0x490168`), whose readers re-send the time, mail,
+    /// battlefield and meeting-stone queries, only with the active player set (`0x490166 je`).
     #[test]
-    fn a_reload_reenters_the_world_enter_cascade_once_the_player_exists() {
+    fn a_reload_sweeps_and_reenters_the_world_enter_cascade_once_the_player_exists() {
         use crate::net::WorldEnterCascadeMessage;
         let reload = |seated: bool| {
             let mut world = World::new();
             world.insert_resource(State::new(crate::char_select::ClientState::InWorld));
             world.insert_resource(crate::run_mode::CaptureMode);
             world.init_resource::<Messages<WorldEnterCascadeMessage>>();
+            world.init_resource::<Messages<WorldLeaveSweepMessage>>();
+            world.init_resource::<LeavingWorldArmed>();
+            world.resource_mut::<LeavingWorldArmed>().arm();
             if seated {
                 world.spawn(crate::net::SelfPlayer);
             }
             world.insert_resource(ReloadUiPending(true));
             run_pending_reload(&mut world);
             assert!(!world.resource::<ReloadUiPending>().0, "the reload ran");
-            world
+            let sweeps = world
+                .resource_mut::<Messages<WorldLeaveSweepMessage>>()
+                .drain()
+                .count();
+            let cascades = world
                 .resource_mut::<Messages<WorldEnterCascadeMessage>>()
                 .drain()
-                .count()
+                .count();
+            (sweeps, cascades)
         };
-        assert_eq!(reload(true), 1, "in the world");
-        assert_eq!(reload(false), 0, "before our own player's create");
+        assert_eq!(reload(true), (1, 1), "in the world");
+        assert_eq!(
+            reload(false).1,
+            0,
+            "no cascade before our own player's create"
+        );
     }
     /// The reference re-makes its Lua state inside `UI_Init` (`0x48fe97`).
     #[test]