Record the field items, fishing and MAIL commits in the session handoff

The handoff lists the four commits for the remaining field items, the
gaps found on the way and the manual test cards, whose backup the
manual-test save writer now produces.

[no-card]

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

tests/human-test-saves.test.ts

@@ -66,6 +66,31 @@ describe.skipIf(!existsSync(romPath) || !process.env.MAKE_TEST_SAVES)(
       write("fly-teleport", world);
     });
 
+    it("writes field-items: New Bark Town's shore with rods, MAIL and a Repel", () => {
+      const a = assets();
+      // Cyndaquil facing the sea with the Old Rod.
+      const world = foundationFixture(a, "fishing");
+      world.state.party.push(
+        generatePartyMon(a.pokemon, {
+          species: 16, // PIDGEY
+          level: 4,
+          item: 0,
+          otId: world.playerId,
+          ot: "CHRIS",
+          dvs: 0x9abc,
+          caughtData: 0,
+        }),
+      );
+      world.state.bag.items = [
+        { item: 0x12, quantity: 5 }, // POTION
+        { item: 0x9e, quantity: 2 }, // FLOWER_MAIL
+        { item: 0x14, quantity: 1 }, // REPEL
+      ];
+      world.state.bag.keyItems.push(0x3b, 0x3d); // GOOD_ROD, SUPER_ROD
+      expect(world.mapId).toBe("24:4");
+      write("field-items", world);
+    });
+
     it("writes headbutt: Route 29 facing a Headbutt tree", () => {
       // Totodile with Headbutt and Tackle, below the first reachable tree.
       const world = foundationFixture(assets(), "headbutt");