Port field moves from the menu, SEL with Select, and moving Pokémon in Bill's PC

Field moves chosen in the party menu run their original checks and the
ROM's from-menu scripts (Cut, Surf, Strength, Flash, Whirlpool, Waterfall,
Sweet Scent), and Softboiled and Milk Drink share HP. SEL registers a key
item that Select then uses, replacing the Key Items shortcut, and Bill's
PC moves Pokémon between the party and every box.

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

docs/SESSION_HANDOFF.md

@@ -1,6 +1,7 @@
 # Recovered Claude session
 
-Latest continuation: see **Evolution: 2026-09-30** at the end of this file. Earlier sections are historical snapshots.
+Latest continuation: see **Field moves, SEL and moving Pokémon: 2026-09-30**
+at the end of this file. Earlier sections are historical snapshots.
 
 Recovered on 2026-09-23 from the local Claude Code transcript
 `~/.claude/projects/-Users-kawa-Crystal/4ac88f30-29e6-4fd5-a4b2-b6a318dd83b3.jsonl`.
@@ -762,3 +763,35 @@ menus; no CI or physical-device run.
 Next: MOVE PKMN W/O MAIL, SEL/registered items with Select, field moves
 from the menu (Cut, Surf, Strength already have their ROM scripts), then
 the Pokégear. Trade evolutions wait for Link.
+
+The evolution increment was committed and pushed as `45275ba`.
+
+## Field moves, SEL and moving Pokémon: 2026-09-30
+
+Resumed with "Continue" after `45275ba`, taking the recorded next items.
+
+- Field moves from the party menu: the world's `menuFieldMove` runs each
+  menu function's checks (badges, facing tile/water/object, dark map) and
+  either queues the ROM's `…FromMenu` script with the chosen Pokémon or
+  returns the ROM's failure texts. Cut, Surf, Strength, Flash, Whirlpool,
+  Waterfall and Sweet Scent work; Softboiled/Milk Drink run in the menu;
+  Fly, Dig, Teleport, Headbutt and Rock Smash give a notice after their
+  checks. Encounter selection was split out of `randomEncounter` so Sweet
+  Scent reuses it without the rate roll.
+- SEL and Select: `registeredItem` saved (migrated by absence), Select runs
+  `SelectMenu` (bike via the `_Register` scripts, Oak's warning, "may be
+  registered", registration cleared when the slot changed). The invented
+  Key Items shortcut (UI, runtime flag and CSS) is removed.
+- Bill's PC MOVE PKMN W/O MAIL, with lists per box.
+- `check:reference` caught `SPRITEMOVEDATA_SMASHABLE_ROCK` written as 18
+  instead of $18; fixed and covered by a Rock Smash test.
+
+Checks: 371 unit tests with the local ROM; 111 Chromium/WebKit browser
+tests passed, 19 skipped intentionally (the two Key Items browser tests now
+cover SEL/Select); native and reference builds, reference, vendor and
+release checks; `git diff --check`. No emulator comparison; no CI or
+physical-device run.
+
+Next: the Pokégear (clock, map, phone and radio cards), then the trainer
+card and options; later the Fly map and Teleport/Dig warps (they need
+script commands after a warp).