Ingestion: Home Assistant WebSocket push path

HomeAssistantWebSocketWorker holds a persistent state_changed subscription per HA endpoint that opts in via the connector's WebSocket toggle (HaEndpointConfig.UseWebSocket): auth handshake, subscribe, ingest in real time, capped-backoff reconnect. The REST poll worker skips WS endpoints so each is served once. HaWebSocketProtocol holds the pure handshake/parse logic. Verified by 11 protocol unit tests + a live integration test against an in-process fake HA server. CLAUDE.md updated.

Claude-Session: https://claude.ai/code/session_01Kib2MniVFbD95fkgLgBBnB

src/Infrastructure/Ingestion/HomeAssistantWorker.cs

@@ -54,9 +54,14 @@ public sealed class HomeAssistantWorker(
         var ingestion = scope.ServiceProvider.GetRequiredService<IngestionService>();
         var client = new HaStateClient(_httpClientFactory.CreateClient());
 
-        var endpoints = await db.IngestionEndpoints
+        // Endpoints using the WebSocket push path are served by HomeAssistantWebSocketWorker; skip
+        // them here so a source is never both polled and pushed.
+        var enabled = await db.IngestionEndpoints
             .Where(e => e.IsEnabled && e.Type == EndpointType.HomeAssistant)
-            .ToDictionaryAsync(e => e.Id, cancellationToken).ConfigureAwait(false);
+            .ToListAsync(cancellationToken).ConfigureAwait(false);
+        var endpoints = enabled
+            .Where(e => !HaEndpointConfig.Parse(e.Config).UseWebSocket)
+            .ToDictionary(e => e.Id);
         if (endpoints.Count == 0)
         {
             return;