feat: add native Windows broadcaster and live score modules

- streamer/windows: vash-broadcast.exe (setup/login/start/stop/status/doctor)
  with per-instance OBS, tosu and FFmpeg, a supervised worker, OCR room
  selection and OBS scene reconciliation; built and tested on Linux only
- streamer/relay.ts shared with Vash TV; Cloudflare Access proxy for dev/staging
- worker status validation and live score helpers for the site
- STREAMING_HANDOFF.md and streamer/ALPHA_TEST.md record what is unverified

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

src/lib/broadcast/worker.test.ts

@@ -0,0 +1,42 @@
+import { describe, expect, test } from 'vitest';
+import { parseWorkerStatus, workerTone } from './worker';
+
+describe('parseWorkerStatus', () => {
+	test('keeps known states and trims what a worker sends', () => {
+		expect(
+			parseWorkerStatus(
+				{
+					state: 'spectating',
+					detail: '  room selected  ',
+					onAir: true,
+					encoder: 'AMD AMF (hardware)',
+					instance: 'prod',
+					version: '0.1.0',
+					extra: 'ignored'
+				},
+				1000
+			)
+		).toEqual({
+			state: 'spectating',
+			detail: 'room selected',
+			onAir: true,
+			encoder: 'AMD AMF (hardware)',
+			instance: 'prod',
+			version: '0.1.0',
+			at: 1000
+		});
+	});
+
+	test('an unknown state shows as needing attention, and nothing unbounded gets through', () => {
+		const status = parseWorkerStatus(
+			{ state: 'toString', detail: 'x'.repeat(1000), onAir: 'yes' },
+			1
+		);
+		expect(status.state).toBe('error');
+		expect(status.detail).toHaveLength(300);
+		expect(status.onAir).toBe(false);
+		expect(parseWorkerStatus({ state: 'weird' }, 1).detail).toBe('Unknown state "weird"');
+		expect(workerTone('login-required')).toBe('bad');
+		expect(workerTone('spectating')).toBe('ok');
+	});
+});