feat(telemetry): Phase B/C/D · ClinicalEventBus + emit (cloud-mvp 6856a7b 이식)

Phase D · telemetry/ClinicalEvent + ClinicalEventBus 신규 (demo-final path):
- sealed 계층 · schemaVersion · severity · isTransition · anonymized sessionId
- MutableSharedFlow (replay=0, buffer=64, DROP_OLDEST · fire-and-forget)
- PhiRedactor 없음 (demo-final) · TelemetryHash.sessionId (inline SHA-256) 사용

Phase A → BvEvent emit (AppState.updateLevelFromMeasurement):
- 매 측정마다 emit · urgency 전이 시 isTransition=true
- bvMethod 이름 · anonymized sessionId

Phase B/C → PostureEvent/GaitEvent emit (PiezoMonitoringView):
- composite posture 전이 시 PostureEvent (매 사이클 X · 트래픽 절약)
- walkingTransitioned 시 GaitEvent (severity=WARN on WALKING 진입)
- prevCompositePosture 상태 신규 추적

기존 SyncEvents/PostureEventLogger 와 병렬 · 서로 독립.

Refs: GUARDIAN-01 §3-2 이벤트 스키마 · §5 Phase A~D

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/src/main/java/com/medithings/vesiscan/AppState.kt

@@ -241,9 +241,34 @@ class AppState(private val context: Context) {
         }
 
         val newUrgency = bladderLevel.urgency
-        if (newUrgency != previousUrgency) {
+        val urgencyChanged = newUrgency != previousUrgency
+        if (urgencyChanged) {
             notificationService.sendUrgencyNotification(newUrgency, volumeMl.toInt())
         }
+
+        // Phase D (GUARDIAN-01 · 2026-08-03) — ClinicalEventBus emit.
+        runCatching {
+            com.medithings.vesiscan.telemetry.ClinicalEventBus.emit(
+                com.medithings.vesiscan.telemetry.BvEvent(
+                    ts = System.currentTimeMillis(),
+                    sessionId = com.medithings.vesiscan.telemetry.TelemetryHash.sessionId(
+                        bleManager.connectedDeviceName.value.ifEmpty { "unknown" }
+                    ),
+                    severity = when (newUrgency) {
+                        com.medithings.vesiscan.models.UrgencyLevel.URGENT ->
+                            com.medithings.vesiscan.telemetry.Severity.CRITICAL
+                        com.medithings.vesiscan.models.UrgencyLevel.WARNING ->
+                            com.medithings.vesiscan.telemetry.Severity.WARN
+                        else -> com.medithings.vesiscan.telemetry.Severity.INFO
+                    },
+                    volumeMl = volumeMl.toInt(),
+                    urgency = newUrgency,
+                    bvMethod = com.medithings.vesiscan.managers.GreenZoneConstants.bvMethod.name,
+                    isTransition = urgencyChanged,
+                    prevUrgency = previousUrgency.takeIf { urgencyChanged },
+                )
+            )
+        }
     }
 
     fun resetLevel() {