feat: add speech telemetry and bundle guard

lib/telemetry/speech.ts

@@ -0,0 +1,42 @@
+interface SpeechTelemetryContext {
+  context: string
+  patientId?: string
+  intakeId?: string
+  reportId?: string
+}
+
+export type SpeechTelemetryAction = 'start' | 'stop' | 'final'
+
+export type SpeechTelemetryPayload = SpeechTelemetryContext & {
+  action: SpeechTelemetryAction
+  metadata?: Record<string, unknown>
+}
+
+export function logSpeechUsage(payload: SpeechTelemetryPayload) {
+  if (typeof window === 'undefined') return
+  const body = JSON.stringify(payload)
+
+  if (navigator.sendBeacon) {
+    try {
+      const blob = new Blob([body], { type: 'application/json' })
+      navigator.sendBeacon('/api/telemetry/speech', blob)
+      return
+    } catch (error) {
+      console.warn('sendBeacon speech telemetry failed, falling back to fetch', error)
+    }
+  }
+
+  fetch('/api/telemetry/speech', {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/json',
+    },
+    body,
+    credentials: 'same-origin',
+    keepalive: true,
+  }).catch((error) => {
+    console.warn('Speech telemetry fetch failed', error)
+  })
+}
+
+export type SpeechTelemetryOptions = SpeechTelemetryContext