Breed at the Day-Care, hatch Eggs, draw MAIL stationery and browse the Hall of Fame (Closes #29)

- Day-Care and breeding: deposits, withdrawal pricing and growth,
  compatibility, egg species, DVs and moves, DayCareStep, egg
  collection and the Odd Egg, compared with the cartridge's routines.
- CountStep: walking happiness, DoEggStep, DayCareStep and DoBikeStep
  in the original's order; HatchEggs with the ROM's hatch animation,
  compared frame by frame with the original.
- MAIL: all ten stationery types and the Portrait MAIL picture,
  compared with the cartridge's tilemaps, graphics and palettes.
- Printing: Bill's PC boxes, Pokedex PRNT, MAIL and the Photo Studio
  take the original's absent-printer path.
- Hall of Fame records (saved apart from the League flag, ready for the
  League to call) and the Hall of Fame PC, compared with the cartridge's
  _HallOfFamePC on 255 pages.

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

tests/human-test-saves.test.ts

@@ -3,9 +3,12 @@ import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
 import { CrystalAssets } from "../src/game/rom/assets";
 import { GameWorld } from "../src/game/world/world";
 import { generatePartyMon } from "../src/game/party/pokemon";
+import { addHallOfFameEntry } from "../src/game/party/hall-of-fame";
+import { ENGINE_FLAGS } from "../src/game/rom/profile";
 import { CRYSTAL_ROM } from "../src/rom/validate";
 import { encodeSave } from "../src/storage/saves";
 import { foundationFixture } from "./foundation-fixture";
+import { settle } from "./world-driver";
 
 // Backups for the manual checks on the project board's "A tester" column,
 // built from the local ROM and imported through Savegames → Import backup
@@ -28,7 +31,9 @@ describe.skipIf(!existsSync(romPath) || !process.env.MAKE_TEST_SAVES)(
     function write(name: string, world: GameWorld) {
       const state = new TextEncoder().encode(JSON.stringify(world.save()));
       // The backup must load as the app would load it.
-      new GameWorld(assets()).restore(JSON.parse(new TextDecoder().decode(state)));
+      new GameWorld(assets()).restore(
+        JSON.parse(new TextDecoder().decode(state)),
+      );
       mkdirSync(OUT, { recursive: true });
       writeFileSync(
         `${OUT}/${name}.crystal-save.json`,
@@ -97,5 +102,104 @@ describe.skipIf(!existsSync(romPath) || !process.env.MAKE_TEST_SAVES)(
       expect(world.mapId).toBe("24:3");
       write("headbutt", world);
     });
+
+    /** A Pokémon of the player's, from (species, level, DVs). */
+    const caught = (
+      a: CrystalAssets,
+      world: GameWorld,
+      species: number,
+      level: number,
+      dvs = 0x9abc,
+    ) =>
+      generatePartyMon(a.pokemon, {
+        species,
+        level,
+        item: 0,
+        otId: world.playerId,
+        ot: "CHRIS",
+        dvs,
+        caughtData: 0,
+      });
+
+    it("writes day-care: inside the Day-Care with a pair that breeds", () => {
+      const a = assets();
+      const world = new GameWorld(a, () => new Date("2026-09-22T12:00:00"));
+      // A female Cyndaquil and a male Typhlosion (Attack and Speed DVs 0
+      // and 15), and a Totodile to keep. The Odd Egg is still to come.
+      world.state.party = [
+        caught(a, world, 155, 20, 0x0201), // CYNDAQUIL
+        caught(a, world, 157, 40, 0xf7f2), // TYPHLOSION
+        caught(a, world, 158, 15), // TOTODILE
+      ];
+      world.state.money = 50000;
+      world.warpTo("11:24", 2, 4); // facing the man
+      settle(world);
+      world.restore({ ...world.save(), direction: "up" });
+      expect(world.mapId).toBe("11:24");
+      write("day-care", world);
+    });
+
+    it("writes egg-hatching: Route 29 with two Eggs two steps from hatching", () => {
+      const a = assets();
+      const world = new GameWorld(a, () => new Date("2026-09-22T12:00:00"));
+      const egg = (species: number, dvs: number, happiness: number) => ({
+        ...caught(a, world, species, 5, dvs),
+        egg: true as const,
+        nickname: "EGG",
+        happiness,
+        hp: 0,
+      });
+      // The Togepi Egg reaches zero on step 128 and stops DoEggStep; the
+      // shiny Pichu's is already zero, so both hatch.
+      world.state.party = [
+        caught(a, world, 155, 20),
+        egg(175, 0x8888, 1), // TOGEPI
+        egg(172, 0x2aaa, 0), // PICHU
+      ];
+      world.restore({
+        ...world.save(),
+        map: "24:3",
+        x: 12,
+        y: 3,
+        direction: "left",
+        stepCount: 0x7e,
+      });
+      settle(world);
+      write("egg-hatching", world);
+    });
+
+    it("writes hall-of-fame: a Pokémon Center whose PC has three teams", () => {
+      const a = assets();
+      const world = new GameWorld(a, () => new Date("2026-09-22T12:00:00"));
+      world.state.flags.add(ENGINE_FLAGS.pokedex);
+      const record = (party: [number, number, number][]) =>
+        addHallOfFameEntry(
+          world.state,
+          party.map(([species, level, dvs]) =>
+            caught(a, world, species, level, dvs),
+          ),
+        );
+      record([[201, 50, 0xffff]]); // UNOWN
+      record([
+        [157, 55, 0x9abc], // TYPHLOSION
+        [29, 30, 0x0000], // NIDORAN♀
+        [32, 31, 0xffff], // NIDORAN♂
+        [25, 100, 0x2aaa], // PIKACHU, shiny
+        [175, 12, 0x9abc], // TOGEPI
+        [249, 70, 0x9abc], // LUGIA
+      ]);
+      record([[158, 42, 0x9abc]]); // TOTODILE
+      world.state.party = [caught(a, world, 155, 20)];
+      world.restore({
+        ...world.save(),
+        map: "26:5",
+        x: 9,
+        y: 2,
+        direction: "up",
+        objects: [],
+      });
+      settle(world);
+      write("hall-of-fame", world);
+    });
   },
 );