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/App/Components/Pages/Admin/Connectors.razor

@@ -71,6 +71,10 @@ else
         {
             <MudTextField @bind-Value="_working.BaseUrl" Label="Base URL (e.g. http://homeassistant.local:8123)" Class="mb-2" />
             <MudTextField @bind-Value="_working.TokenEnv" Label="Token env-var name (e.g. HA_TOKEN)" Class="mb-2" />
+            <MudSwitch T="bool" @bind-Value="_working.UseWebSocket" Label="Real-time WebSocket push" Color="Color.Primary" Class="mb-1" />
+            <MudText Typo="Typo.caption" Color="Color.Secondary" Class="mb-2 d-block">
+                On: subscribe to state changes and ingest in real time. Off: REST poll on each source's interval.
+            </MudText>
             <MudTextField @bind-Value="_working.TestEntityId" Label="Test entity id (optional, e.g. sensor.house_power)" Class="mb-2" />
             <MudButton Variant="Variant.Outlined" StartIcon="@Icons.Material.Filled.NetworkCheck" OnClick="TestHaAsync" Disabled="_testing" Class="mb-2">
                 Test connection
@@ -130,7 +134,7 @@ else
             _working = new EditModel
             {
                 Id = endpoint.Id, Type = endpoint.Type, Name = endpoint.Name, IsEnabled = endpoint.IsEnabled,
-                BaseUrl = ha.BaseUrl, TokenEnv = ha.TokenEnv,
+                BaseUrl = ha.BaseUrl, TokenEnv = ha.TokenEnv, UseWebSocket = ha.UseWebSocket,
             };
         }
         else
@@ -170,7 +174,7 @@ else
         }
 
         var config = _working.Type == EndpointType.HomeAssistant
-            ? new HaEndpointConfig { BaseUrl = Trim(_working.BaseUrl), TokenEnv = Trim(_working.TokenEnv) }.ToJson()
+            ? new HaEndpointConfig { BaseUrl = Trim(_working.BaseUrl), TokenEnv = Trim(_working.TokenEnv), UseWebSocket = _working.UseWebSocket }.ToJson()
             : new EndpointConfig
             {
                 Host = string.IsNullOrWhiteSpace(_working.Host) ? "localhost" : _working.Host.Trim(),
@@ -234,6 +238,7 @@ else
         // Home Assistant
         public string? BaseUrl { get; set; }
         public string? TokenEnv { get; set; }
+        public bool UseWebSocket { get; set; }
         public string? TestEntityId { get; set; }
 
         // MQTT broker