Clinical Sync Batch Engine: first commit

VigilCareClinicalAPI/Observability/Metrics/ClinicalMetrics.cs

@@ -83,6 +83,10 @@ public sealed class ClinicalMetrics
         "PHI access log entries written.",
         labelNames: new[] { "access_type" });
 
+    public readonly Counter ClinicalSyncBatchesTotal = Metrics.CreateCounter(
+        "clinical_sync_batches_total",
+        "Sync batches processed",
+        labelNames: new[] { "status" });
     // --- Histograms ---
 
     // Measures the full ingest transaction: Redis cache lookup + alert evaluation +
@@ -120,6 +124,14 @@ public sealed class ClinicalMetrics
             Buckets = new[] { 0.001, 0.005, 0.01, 0.025, 0.05, 0.1 }
         });
 
+    public readonly Histogram ClinicalSyncBatchDuration = Metrics.CreateHistogram(
+        "clinical_sync_batch_duration_seconds",
+        "Batch processing duration",
+        new HistogramConfiguration
+        {
+            Buckets = new[] { 0.1, 0.25, 0.5, 1.0, 2.5, 5.0, 10.0 }
+        });
+
     // --- Gauges (set by background collectors, not incremented inline) ---
 
     // The most clinically significant panel. A non-zero value means a patient's