Open Kanto: the S.S. Aqua, the Kanto gyms, the Magnet Train, Mt. Silver and Red (Closes #33)

All 146 Kanto maps, Route 22, Route 28 and Silver Cave are open. The
Magnet Train, Snorlax and the Poké Flute channel, the Diploma, the Trainer
House, Bill's grandpa, Oak's Pokédex rating in Pallet and Goldenrod's
postgame move tutor are ported; big objects cover 2x2 tiles. The Magnet
Train and the Diploma are compared with the cartridge frame by frame.

The playthrough continues from the Hall of Fame through the S.S. Aqua,
the eight Kanto badges, Oak opening Mt. Silver and Red's defeat and
credits.

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

tests/atlas.test.ts

@@ -102,9 +102,8 @@ describe.skipIf(!existsSync(romPath))("the region atlas", () => {
     expect(at(LANDMARK_ROUTE_29).flypoint).toBeUndefined();
     expect(at(LANDMARK_AZALEA_TOWN)).toMatchObject({ open: true, flypoint: { visited: false } });
     expect(at(LANDMARK_BLACKTHORN_CITY)).toMatchObject({ open: true, flypoint: { visited: false } });
-    // Mt. Silver's cave belongs to Kanto's postgame (board #33).
-    expect(at(LANDMARK_SILVER_CAVE)).toMatchObject({ open: false, flypoint: { visited: false } });
-    // Kanto stays closed, so asking for it shows Johto.
+    expect(at(LANDMARK_SILVER_CAVE)).toMatchObject({ open: true, flypoint: { visited: false } });
+    // Before Indigo Plateau or a step into Kanto, asking for it shows Johto.
     expect(world.atlas("kanto").region).toBe("johto");
   });
 
@@ -114,7 +113,7 @@ describe.skipIf(!existsSync(romPath))("the region atlas", () => {
     const kanto = world.atlas("kanto");
     expect(kanto.region).toBe("kanto");
     expect(kanto.player).toBeUndefined();
-    expect(kanto.landmarks[0]).toMatchObject({ landmark: LANDMARK_PALLET_TOWN, open: false });
+    expect(kanto.landmarks[0]).toMatchObject({ landmark: LANDMARK_PALLET_TOWN, open: true });
     expect(kanto.landmarks).toHaveLength(OW.KANTO_LANDMARK_LAST - OW.KANTO_LANDMARK + 1);
   });