add hermes agent provider

ios/Packages/Sybil/Sources/Sybil/SybilViewModel.swift

@@ -141,7 +141,8 @@ final class SybilViewModel {
     private let fallbackModels: [Provider: [String]] = [
         .openai: ["gpt-4.1-mini"],
         .anthropic: ["claude-3-5-sonnet-latest"],
-        .xai: ["grok-3-mini"]
+        .xai: ["grok-3-mini"],
+        .hermesAgent: ["hermes-agent"]
     ]
 
     init(
@@ -160,6 +161,12 @@ final class SybilViewModel {
         modelOptions(for: provider)
     }
 
+    var providerOptions: [Provider] {
+        Provider.allCases.filter { candidate in
+            candidate != .hermesAgent || modelCatalog[candidate] != nil
+        }
+    }
+
     func modelOptions(for candidate: Provider) -> [String] {
         let serverModels = modelCatalog[candidate]?.models ?? []
         if !serverModels.isEmpty {
@@ -893,6 +900,11 @@ final class SybilViewModel {
     }
 
     private func syncModelSelectionWithServerCatalog() {
+        if !providerOptions.contains(provider), let firstProvider = providerOptions.first {
+            provider = firstProvider
+            settings.preferredProvider = firstProvider
+        }
+
         if !providerModelOptions.contains(model), let first = providerModelOptions.first {
             model = first
             settings.preferredModelByProvider[provider] = first