Play the music and sound effects from the ROM's sound engine (Closes #34)

The sound engine (audio/engine.asm, home/audio.asm) is ported on a byte
copy of its audio WRAM and a sound register model. A reference test runs
the cartridge's routines beside it and matches the WRAM and registers
after every UpdateSound for all songs, effects and cries, fades, the
danger tone and effect priority. apu.ts synthesizes the four channels in
an AudioWorklet; its output matches the reference emulator's APU by
spectrum. The world runs the engine twice per tick; Play or the first
press unlocks sound, pausing suspends it, Settings sets the volume.

Wired in: map music by map setup and special map music, script audio
commands, text fanfares, WaitSFX and cries that hold the script frozen
(the last page stays shown), battle music, cries, fainting, victory,
capture and the low HP tone, Pokémon Center healing, evolution, the
intro, the Pokédex's cries, PCs, marts, healing items, talk and menu
clicks, bumps, ledges, warps, boulders, the Bicycle and Surf.

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

src/game/scripts/text.ts

@@ -86,8 +86,22 @@ export interface TextContext {
   /** Native handlers for text_asm, keyed by the command's ROM offset. They
    * return where text continues, as the original routine returns in hl. */
   asm?: (offset: number) => number | undefined;
+  /** TextCommand_SOUND's sound effect (TextSFX), with the length of the
+   * text printed before it. */
+  onSound?: (sfx: number, at: number) => void;
 }
 
+/** TextSFX: the text commands that play a sound effect, and its id. */
+const TEXT_SFX: Readonly<Record<number, number>> = {
+  0x0b: 0x00, // SFX_DEX_FANFARE_50_79
+  0x0e: 0x09, // SFX_DEX_FANFARE_20_49
+  0x0f: 0x01, // SFX_ITEM
+  0x10: 0x02, // SFX_CAUGHT_MON
+  0x11: 0x0a, // SFX_DEX_FANFARE_80_109
+  0x12: 0x2d, // SFX_FANFARE
+  0x13: 0x2c, // SFX_SLOT_MACHINE_START
+};
+
 export const defaultTextContext = (player: string): TextContext => ({
   player,
   // New games initialize these names before the player can choose them.
@@ -252,6 +266,7 @@ export function readTextEnd(
         break;
       }
       case 0x0a:
+        break; // Timed pauses belong to presentation.
       case 0x0b:
       case 0x0e:
       case 0x0f:
@@ -259,7 +274,8 @@ export function readTextEnd(
       case 0x11:
       case 0x12:
       case 0x13:
-        break; // Timed pauses and sound cues belong to presentation/audio.
+        context.onSound?.(TEXT_SFX[command], output.length);
+        break;
       case 0x0c:
         output += "…".repeat(reader.byte(p++));
         break;
@@ -275,10 +291,12 @@ export function readTextEnd(
         output += context.weekday;
         break;
       case 0x16: {
+        const before = output.length,
+          onSound = context.onSound;
         const nested = readTextEnd(
           reader,
           reader.near(p, reader.byte(p + 2)),
-          context,
+          onSound ? { ...context, onSound: (sfx, at) => onSound(sfx, before + at) } : context,
           depth + 1,
         );
         output += nested.text;