feat(webaudio): enable AudioContext sharing for webaudioRepl

- Add support for optional `existingAudioCtx` parameter in `webaudioRepl()` function
- When provided, sets it as the default AudioContext via `setDefaultAudioContext()`
- Allows integration with external systems that manage their own Web Audio API context
- Maintains backward compatibility with existing usage patterns

packages/webaudio/webaudio.mjs

@@ -5,7 +5,7 @@ This program is free software: you can redistribute it and/or modify it under th
 */
 
 import * as strudel from '@strudel/core';
-import { superdough, getAudioContext, setLogger, doughTrigger, registerWorklet } from 'superdough';
+import { superdough, setDefaultAudioContext, getAudioContext, setLogger, doughTrigger, registerWorklet } from 'superdough';
 import './supradough.mjs';
 import { workletUrl } from 'supradough';
 
@@ -27,6 +27,9 @@ export const webaudioOutput = (hap, _deadline, hapDuration, cps, t) => {
 };
 
 export function webaudioRepl(options = {}) {
+  if (options.existingAudioCtx) {
+    setDefaultAudioContext(options.existingAudioCtx);
+  }
   options = {
     getTime: () => getAudioContext().currentTime,
     defaultOutput: webaudioOutput,