feature: Ward Gateway Service (Local-First Clinical Path)

VigilCare.WardGateway/Infrastructure/EncounterReplicaReadyCheck.cs

@@ -0,0 +1,24 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+
+public sealed class EncounterReplicaReadyCheck : IHealthCheck
+{
+    private readonly GatewayDbContext _db;
+
+    public EncounterReplicaReadyCheck(GatewayDbContext db) => _db = db;
+
+    public async Task<HealthCheckResult> CheckHealthAsync(
+        HealthCheckContext context, CancellationToken ct = default)
+    {
+        var encounterCount = await _db.Encounters.CountAsync(ct);
+        if (encounterCount > 0)
+            return HealthCheckResult.Healthy("Replica data available.");
+
+        var state = await _db.SyncState.FirstOrDefaultAsync(ct);
+        if (state?.InitialSyncCompleted == true)
+            return HealthCheckResult.Healthy("Initial sync completed.");
+
+        return HealthCheckResult.Unhealthy(
+            "No encounter replica data — first boot requires central sync.");
+    }
+}