Port the fishing rods and wild Magikarp

The Old, Good and Super Rods run FishFunction facing water: the map's fish
group and Fish pick no fish, no bite, or a Pokémon from FishGroups and the
time of day's TimeFishGroups. The player casts and jiggles with the
fishing frames drawn from LoadFishingGFX's tiles, shows "!" on a bite, and
the hooked Pokémon attacks as BATTLETYPE_FISH. Facing pieces now use
signed offsets, which the rod above and left of the player needs.

Wild Magikarp no longer stop a battle: LoadEnemyMon redraws their DVs
through CalcMagikarpLength and its filters, as the original does. The
length routine matches the original in the reference emulator.

Part of #27

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

src/game/rom/profile.ts

@@ -161,6 +161,8 @@ export const RAM = {
   visitedSpawns: 0xdca5,
   tempWildMonSpecies: 0xd22e,
   coins: 0xd855,
+  /** hBGMapMode: HRAM, like hMoneyTemp below. */
+  bgMapMode: 0xffd4,
   blueCardBalance: 0xdc4b,
   /** hMoneyTemp: HRAM, not WRAM like the other entries above. */
   moneyTemp: 0xffc3,
@@ -274,6 +276,16 @@ export const OVERWORLD = {
   "_BasementKey.BasementKeyScript": 0x507e1,
   "_Squirtbottle.SquirtbottleScript": 0x5073c,
   "_Squirtbottle.CheckCanUseSquirtbottle": 0x50753,
+  FishGroups: 0x92488,
+  TimeFishGroups: 0x9266f,
+  Script_GotABite: 0xd035,
+  Script_NotEvenANibble: 0xd01e,
+  Script_NotEvenANibble2: 0xd027,
+  Fishing_CheckFacingUp: 0xd06c,
+  LoadFishingGFX: 0xb84b3,
+  PutTheRodAway: 0xd095,
+  FishingGFX: 0xb84f2,
+  KrisFishingGFX: 0xb8582,
   Flypoints: 0x91c5e,
   "TownMapBubble.Where": 0x91bf4,
   RuinsOfAlphKabutoChamber_MapAttributes: 0x958d0,
@@ -531,6 +543,9 @@ export const MENU = {
   CardKeyEffect: 0xf745,
   BasementKeyEffect: 0xf74c,
   SquirtbottleEffect: 0xf73e,
+  OldRodEffect: 0xf5a5,
+  GoodRodEffect: 0xf5a9,
+  SuperRodEffect: 0xf5ad,
   VitaminEffect: 0xee3d,
   RareCandyEffect: 0xef14,
   ItemStatRoseText: 0xeea6,
@@ -548,6 +563,8 @@ export const MENU = {
 /** Battle engine tables and texts, keyed by their PRET labels so that
  * \`npm run check:reference\` can verify each address by name. */
 export const BATTLE = {
+  HookedPokemonAttackedText: 0x8075c,
+  MagikarpLengths: 0xfbca8,
   ItemUsedText: 0xf83d,
   BallBrokeFreeText: 0xedb5,
   BallAppearedCaughtText: 0xedba,