feat(aircoding): AirCoding V2 baseline — deterministic multi-agent architecture

Forked from OpenCode v1.17.4 with multi-agent system:
- 5 agents: aircoding, scheduler, worker, architect, reviewer
- Deterministic DAG scheduling engine (coordinator_tick)
- Tool whitelists as hard enforcement
- AirCoding validation plugin
- V1 requirements: C4 docs, ADR, AGENTS.md, debug-log.md
- Design documents in docs/

packages/tui/src/audio.ts

@@ -0,0 +1,53 @@
+import { Audio, type AudioErrorContext, type AudioPlayOptions, type AudioSound, type AudioVoice } from "@opentui/core"
+import { readFile } from "node:fs/promises"
+
+let audio: Audio | null | undefined
+const sounds = new Map<string, Promise<AudioSound | null>>()
+
+function getAudio() {
+  if (audio !== undefined) return audio
+  try {
+    const next = Audio.create({ autoStart: false })
+    next.on("error", (error: Error, context: AudioErrorContext) => {
+      console.debug("tui audio error", { error, context })
+    })
+    audio = next
+    return next
+  } catch (error) {
+    console.debug("failed to create tui audio", { error })
+    audio = null
+    return null
+  }
+}
+
+export function loadSoundFile(file: string) {
+  const current = getAudio()
+  if (!current) return Promise.resolve(null)
+  const cached = sounds.get(file)
+  if (cached) return cached
+  const task = readFile(file)
+    .then((bytes) => current.loadSound(bytes))
+    .catch((error) => {
+      console.debug("failed to load tui sound", { file, error })
+      return null
+    })
+  sounds.set(file, task)
+  return task
+}
+
+export function play(sound: AudioSound, options?: AudioPlayOptions) {
+  const current = getAudio()
+  if (!current) return null
+  if (!current.isStarted() && !current.start()) return null
+  return current.play(sound, options)
+}
+
+export function stopVoice(voice: AudioVoice) {
+  return audio?.stopVoice(voice) ?? false
+}
+
+export function dispose() {
+  audio?.dispose()
+  audio = undefined
+  sounds.clear()
+}