Open Route 29 and Cherrygrove City

- Enable Route 29, its Route 46 gate, Cherrygrove City and its buildings.
- Run item balls through FindItemInBallScript and fruit trees through
  FruitTreeScript, with a native daily reset of the daily engine flags.
- Port the Pokémon Center nurse (HealParty with the PP Up clamp,
  CheckPokerus, phone-call checks) and record the whiteout spawn on
  entering a Pokémon Center, as EnterMapWarp does.
- Port standard Poké Marts with keyboard, D-pad and pointer menus.
- Add the recoil battle command (Struggle) and VAR_BOXSPACE.
- Save fruit trees, the daily reset day and the last spawn map; older
  version-3 backups migrate by absence.

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

docs/SESSION_HANDOFF.md

@@ -130,3 +130,30 @@ vendor and reference checks; `git diff --check`. Not committed.
 
 Next: Route 29 (`24:3`) scripts, catching tutorial and items before enabling it;
 then capture, switching and PACK in battle.
+
+## Route 29 and Cherrygrove increment: 2026-09-23
+
+Enabled Route 29, its Route 46 gate, Cherrygrove City and its five buildings.
+Item balls, the Pokémon Center nurse and the Poké Mart were each ported by a
+Sonnet sub-agent in an isolated worktree, reviewed against the disassembly and
+merged; the rest was done directly.
+
+- Fruit trees run `FruitTreeScript`; a native `CheckDailyResetTimer` clears
+  the daily engine flags once per game day. `VAR_BOXSPACE` reads an empty box.
+- Item balls run `FindItemInBallScript` with a native `TryReceiveItem`.
+- The nurse runs `PokecenterNurseScript`; `HealParty` now applies
+  `ComputeMaxPP`'s PP Up clamp. `EnterMapWarp`'s spawn recording makes
+  whiteouts return to the last Pokémon Center entered.
+- Standard marts run natively (`StandardMart`/`BuyMenu`/`SellMenu`).
+- Battle command `recoil` (Struggle) was the only refusal found by a local
+  stress run of 360 Route 29 battles across starters and times of day.
+- Save format 3 gained `fruitTrees`, `dailyReset` and `lastSpawnMap`
+  (migrated by absence).
+- The phone-width status bar layout and parity test map counts were fixed.
+
+Still refused: `catchtutorial` and Cherrygrove's rival scene (both after the
+Mystery Egg), Route 30/46. NPCs do not roam yet.
+
+Next: NPC roaming movement (`map_objects.asm` random walk/spin, radius and
+visibility rules, deterministic RNG in tests), trainer sight lines and trainer
+battles, Route 30 and Mr. Pokémon, capture and the catching tutorial.