macros: an edge the map graph cannot name stops being somewhere new once it is stood on

The rung-11 reading of row 54. Route 3's connections read north and west off the cartridge
(`wCurMapConnections`, and it has no warps at all) while the geography table carries west and east,
so the seven walkable tiles of its north edge had an unnameable destination -- and an unnameable
destination counted as unvisited, which made them first-tier for `GO ROUTE` on every hold for ever,
with `GO OBJECTIVE` off the pad beside them because nothing on that map leads to the objective.

A warp's destination is a byte the cartridge publishes, so `None` there is the `LAST_MAP` case
already handled. An edge's comes only from `geography::connected`, so `None` there means the table
cannot name the map on the other side and never will, and the only record left is the adapter's own
boundary ledger. It narrows: a genuinely new edge is still first-tier until the fly reaches it.

Which map is north of Route 3 is not guessed at here. That is a survey -- walk the fly off the edge
with real presses and read the map id back -- and it is recorded as a residual instead.

services/flysim/crates/flybrain-gb/src/pokemon_red/macros/palette.rs

@@ -1298,9 +1298,23 @@ fn exit_tiers(state: &mut dyn MacroState, way: Way) -> Vec<Exit> {
         let known_visited = match exit.destination(here) {
             Some(map) => state.map_visited(map),
             // A front door nobody can name opens on the map the fly came in from, which is a map
-            // this run has stood on by construction. Every other unnameable destination stays a
+            // this run has stood on by construction.
-            // candidate.
+            None if exit.way == Way::Exit => true,
-            None => exit.way == Way::Exit,
+            // **An edge the geography table has no row for** (2026-09-22, the rung-11 reading of
+            // row 54). A warp's destination is a byte the cartridge publishes, so `None` there is
+            // the `LAST_MAP` case above; an edge's destination comes only from
+            // [`geography::connected`], so `None` here means the table cannot name the map on the
+            // other side and never will. Route 3 is the measured one: the cartridge reports its
+            // connections as **north and west** while the table carries west and *east*, so its
+            // seven walkable north-edge tiles answered "leads somewhere this run has not stood
+            // on" on every hold for ever, and `GO ROUTE` aimed at them once per hold.
+            //
+            // The only record left is the adapter's own boundary ledger, which is what section
+            // 9.2 replaced as the *general* test and which is still the honest answer for an exit
+            // nothing else can say anything about: an edge the run has already stood on is not
+            // somewhere new. It narrows, so a genuinely new edge is still first-tier until the
+            // fly reaches it.
+            None => state.exit_visited(exit.id),
         };
         if !known_visited {
             fresh.push(*exit);

services/flysim/crates/flybrain-gb/src/pokemon_red/macros/tests.rs

@@ -3970,6 +3970,37 @@ fn go_shop_and_go_heal_are_on_the_pad_while_their_errand_stands() {
     assert!(!on_the_pad(&mut pallet, MacroKind::GoHeal));
 }
 
+#[test]
+fn an_edge_the_table_cannot_name_stops_being_somewhere_new_once_it_is_stood_on() {
+    // The rung-11 reading of row 54 (`infra/docs/macros-traps.md`). The cartridge reports Route
+    // 3's connections as north and west; `geography`'s row carries west and east, so the north
+    // edge's destination is unnameable -- and an unnameable destination counted as *unvisited*,
+    // which made those tiles first-tier for `GO ROUTE` on every hold for ever, with
+    // `GO OBJECTIVE` off the pad beside them because nothing on this map leads to the objective.
+    let mut world = World::room();
+    world.map = maps::ROUTE_3;
+    world.size = MapSize { width: 8, height: 8 };
+    world.player = Tile::new(4, 4);
+    world.connections = Connections { north: true, south: false, east: false, west: true };
+    // West is Pewter City, which the table does name and the run has stood on.
+    world.seen_maps.insert(maps::PEWTER_CITY);
+
+    let north: Vec<ExitId> = ways(&mut world, Way::Route).iter().map(|exit| exit.id).collect();
+    assert!(
+        north.iter().all(|id| *id == ExitId::Edge(Edge::North)),
+        "the unnameable north edge is the only fresh way out: {north:?}"
+    );
+
+    // Stood on, and it is no longer somewhere new -- so the walk falls to the tier that leads
+    // toward the objective instead of aiming at the same edge once per hold for ever.
+    world.visited.insert(ExitId::Edge(Edge::North));
+    let left: Vec<ExitId> = ways(&mut world, Way::Route).iter().map(|exit| exit.id).collect();
+    assert!(
+        !left.contains(&ExitId::Edge(Edge::North)),
+        "an edge nothing can name, already crossed, is not first-tier: {left:?}"
+    );
+}
+
 #[test]
 fn an_errand_does_not_settle_on_the_doormat_it_is_standing_on() {
     // Row 54 of `infra/docs/macros-traps.md`, and section 12.2's rule: "a macro that completes