Add Node.js WebSocket example scripts

listen.mjs: prints all events as JSON objects.
transcripts.mjs: prints transcript text only.
Both use Node 21+ built-in WebSocket — no libraries required.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

examples/listen.mjs

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+// Connect to the STT server and print all events.
+// Usage: node listen.mjs
+
+const PORT = process.env.STT_PORT ?? '11501'
+const ws   = new WebSocket(`ws://localhost:${PORT}`)
+
+ws.addEventListener('open', () => {
+	process.stderr.write(`connected to ws://localhost:${PORT}\n`)
+})
+
+ws.addEventListener('message', ({ data }) => {
+	const event = JSON.parse(data)
+	console.log(event)
+})
+
+ws.addEventListener('close', () => {
+	process.stderr.write('disconnected\n')
+	process.exit(0)
+})
+
+ws.addEventListener('error', (err) => {
+	process.stderr.write(`error: ${err.message}\n`)
+	process.exit(1)
+})

examples/transcripts.mjs

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+// Connect to the STT server and print transcript text only.
+// Usage: node transcripts.mjs
+
+const PORT = process.env.STT_PORT ?? '11501'
+const ws   = new WebSocket(`ws://localhost:${PORT}`)
+
+ws.addEventListener('open', () => {
+	process.stderr.write(`connected to ws://localhost:${PORT}\n`)
+})
+
+ws.addEventListener('message', ({ data }) => {
+	const event = JSON.parse(data)
+	if (event.event === 'transcript') {
+		console.log(event.text)
+	}
+})
+
+ws.addEventListener('close', () => process.exit(0))
+ws.addEventListener('error', () => process.exit(1))