`@cloudflare/voice-twilio`: outbound agent audio dropped when messages arrive as `Blob`

### Package

`@cloudflare/voice-twilio@0.1.0` (`TwilioAdapter`) with `agents@0.23.0`

### Description

Even after the agent WebSocket is connected, callers often hear nothing (or only silence) from the agent.

The voice agent sends binary audio as `Blob` over the WebSocket. The Twilio adapter's outbound handler only forwards `ArrayBuffer`:

```ts
else if (event.data instanceof ArrayBuffer) {
// convert / send to Twilio
}
```

`Blob` frames are ignored, so TTS audio never reaches Twilio.

### Expected

Any binary audio from the agent (`ArrayBuffer` or `Blob`) is forwarded to Twilio as Media Streams `media` events.

### Actual

`Blob` audio is dropped → silent call after connect / greeting never plays.

### Workaround

Before accepting the agent socket:

```ts
agent.binaryType = "arraybuffer";
agent.accept();
```

Or handle both:

```ts
if (event.data instanceof ArrayBuffer) { /* ... */ }
else if (event.data instanceof Blob) {
const buf = await event.data.arrayBuffer();
/* ... */
}
```

### Notes

This is independent of TTS codec choice. Even with ElevenLabs `ulaw_8000` / PCM16, frames never leave the adapter if they arrive as `Blob`.