feat: updateSystemAi + testSystemAi RPCs (v0.5.0)

`HubClient.updateSystemAi(...)` persists a new System-AI config
to ~/.fai/config.yaml AND hot-reloads the live hub state in one
round-trip; returns the resulting SystemAiStatus so the UI
refreshes without a second call.

`HubClient.testSystemAi()` probes the configured provider with
a tiny ping and returns the same error-kind taxonomy as askAi.
Studio's "Test connection" button uses this.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/src/generated/fai/v1/hub.pb.dart

@@ -3037,6 +3037,114 @@ class AskAiResponse extends $pb.GeneratedMessage {
   void clearLatencyMs() => $_clearField(3);
 }
 
+class UpdateSystemAiRequest extends $pb.GeneratedMessage {
+  factory UpdateSystemAiRequest({
+    $core.String? provider,
+    $core.String? endpoint,
+    $core.String? model,
+    $core.String? apiKeyEnv,
+    $core.String? privacyMode,
+  }) {
+    final $result = create();
+    if (provider != null) {
+      $result.provider = provider;
+    }
+    if (endpoint != null) {
+      $result.endpoint = endpoint;
+    }
+    if (model != null) {
+      $result.model = model;
+    }
+    if (apiKeyEnv != null) {
+      $result.apiKeyEnv = apiKeyEnv;
+    }
+    if (privacyMode != null) {
+      $result.privacyMode = privacyMode;
+    }
+    return $result;
+  }
+  UpdateSystemAiRequest._() : super();
+  factory UpdateSystemAiRequest.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory UpdateSystemAiRequest.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'UpdateSystemAiRequest', package: const $pb.PackageName(_omitMessageNames ? '' : 'fai.v1'), createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'provider')
+    ..aOS(2, _omitFieldNames ? '' : 'endpoint')
+    ..aOS(3, _omitFieldNames ? '' : 'model')
+    ..aOS(4, _omitFieldNames ? '' : 'apiKeyEnv')
+    ..aOS(5, _omitFieldNames ? '' : 'privacyMode')
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  UpdateSystemAiRequest clone() => UpdateSystemAiRequest()..mergeFromMessage(this);
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  UpdateSystemAiRequest copyWith(void Function(UpdateSystemAiRequest) updates) => super.copyWith((message) => updates(message as UpdateSystemAiRequest)) as UpdateSystemAiRequest;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static UpdateSystemAiRequest create() => UpdateSystemAiRequest._();
+  UpdateSystemAiRequest createEmptyInstance() => create();
+  static $pb.PbList<UpdateSystemAiRequest> createRepeated() => $pb.PbList<UpdateSystemAiRequest>();
+  @$core.pragma('dart2js:noInline')
+  static UpdateSystemAiRequest getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<UpdateSystemAiRequest>(create);
+  static UpdateSystemAiRequest? _defaultInstance;
+
+  /// ollama / openai / lmstudio / vllm / custom (defaults to
+  /// ollama if empty).
+  @$pb.TagNumber(1)
+  $core.String get provider => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set provider($core.String v) { $_setString(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasProvider() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearProvider() => $_clearField(1);
+
+  /// Full URL up to and including /v1. Empty + privacy_mode!=off
+  /// → returns InvalidArgument.
+  @$pb.TagNumber(2)
+  $core.String get endpoint => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set endpoint($core.String v) { $_setString(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasEndpoint() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearEndpoint() => $_clearField(2);
+
+  /// Model identifier the provider expects. Empty +
+  /// privacy_mode!=off → returns InvalidArgument.
+  @$pb.TagNumber(3)
+  $core.String get model => $_getSZ(2);
+  @$pb.TagNumber(3)
+  set model($core.String v) { $_setString(2, v); }
+  @$pb.TagNumber(3)
+  $core.bool hasModel() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearModel() => $_clearField(3);
+
+  /// Name of the env var holding the API key. Empty = no auth.
+  @$pb.TagNumber(4)
+  $core.String get apiKeyEnv => $_getSZ(3);
+  @$pb.TagNumber(4)
+  set apiKeyEnv($core.String v) { $_setString(3, v); }
+  @$pb.TagNumber(4)
+  $core.bool hasApiKeyEnv() => $_has(3);
+  @$pb.TagNumber(4)
+  void clearApiKeyEnv() => $_clearField(4);
+
+  /// off / redacted / full. Empty defaults to "off".
+  @$pb.TagNumber(5)
+  $core.String get privacyMode => $_getSZ(4);
+  @$pb.TagNumber(5)
+  set privacyMode($core.String v) { $_setString(4, v); }
+  @$pb.TagNumber(5)
+  $core.bool hasPrivacyMode() => $_has(4);
+  @$pb.TagNumber(5)
+  void clearPrivacyMode() => $_clearField(5);
+}
+
 
 const _omitFieldNames = $core.bool.fromEnvironment('protobuf.omit_field_names');
 const _omitMessageNames = $core.bool.fromEnvironment('protobuf.omit_message_names');

lib/src/generated/fai/v1/hub.pbgrpc.dart

@@ -195,6 +195,14 @@ class HubAdminClient extends $grpc.Client {
       '/fai.v1.HubAdmin/AskAi',
       ($0.AskAiRequest value) => value.writeToBuffer(),
       ($core.List<$core.int> value) => $0.AskAiResponse.fromBuffer(value));
+  static final _$updateSystemAi = $grpc.ClientMethod<$0.UpdateSystemAiRequest, $0.SystemAiStatusResponse>(
+      '/fai.v1.HubAdmin/UpdateSystemAi',
+      ($0.UpdateSystemAiRequest value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.SystemAiStatusResponse.fromBuffer(value));
+  static final _$testSystemAi = $grpc.ClientMethod<$1.Empty, $0.AskAiResponse>(
+      '/fai.v1.HubAdmin/TestSystemAi',
+      ($1.Empty value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.AskAiResponse.fromBuffer(value));
 
   HubAdminClient(super.channel, {super.options, super.interceptors});
 
@@ -306,6 +314,23 @@ class HubAdminClient extends $grpc.Client {
   $grpc.ResponseFuture<$0.AskAiResponse> askAi($0.AskAiRequest request, {$grpc.CallOptions? options}) {
     return $createUnaryCall(_$askAi, request, options: options);
   }
+
+  /// Persist a new system-AI configuration. Updates the live
+  /// hub state AND writes back to ~/.fai/config.yaml so the
+  /// change survives daemon restart. Used by Studio's settings
+  /// editor. Returns the resulting status (same shape as
+  /// SystemAiStatus) so the UI can refresh in one round-trip.
+  $grpc.ResponseFuture<$0.SystemAiStatusResponse> updateSystemAi($0.UpdateSystemAiRequest request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$updateSystemAi, request, options: options);
+  }
+
+  /// Probe the configured provider with an empty ping (model
+  /// listing or short message). Returns the same error_kind
+  /// taxonomy as AskAi so Studio's "Test connection" button
+  /// can render the same inline fix copy.
+  $grpc.ResponseFuture<$0.AskAiResponse> testSystemAi($1.Empty request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$testSystemAi, request, options: options);
+  }
 }
 
 @$pb.GrpcServiceName('fai.v1.HubAdmin')
@@ -439,6 +464,20 @@ abstract class HubAdminServiceBase extends $grpc.Service {
         false,
         ($core.List<$core.int> value) => $0.AskAiRequest.fromBuffer(value),
         ($0.AskAiResponse value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.UpdateSystemAiRequest, $0.SystemAiStatusResponse>(
+        'UpdateSystemAi',
+        updateSystemAi_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.UpdateSystemAiRequest.fromBuffer(value),
+        ($0.SystemAiStatusResponse value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$1.Empty, $0.AskAiResponse>(
+        'TestSystemAi',
+        testSystemAi_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $1.Empty.fromBuffer(value),
+        ($0.AskAiResponse value) => value.writeToBuffer()));
   }
 
   $async.Future<$0.CapabilityList> listCapabilities_Pre($grpc.ServiceCall $call, $async.Future<$1.Empty> $request) async {
@@ -513,6 +552,14 @@ abstract class HubAdminServiceBase extends $grpc.Service {
     return askAi($call, await $request);
   }
 
+  $async.Future<$0.SystemAiStatusResponse> updateSystemAi_Pre($grpc.ServiceCall $call, $async.Future<$0.UpdateSystemAiRequest> $request) async {
+    return updateSystemAi($call, await $request);
+  }
+
+  $async.Future<$0.AskAiResponse> testSystemAi_Pre($grpc.ServiceCall $call, $async.Future<$1.Empty> $request) async {
+    return testSystemAi($call, await $request);
+  }
+
   $async.Future<$0.CapabilityList> listCapabilities($grpc.ServiceCall call, $1.Empty request);
   $async.Future<$0.ModuleInfoResponse> moduleInfo($grpc.ServiceCall call, $0.ModuleInfoRequest request);
   $async.Future<$0.CheckPermissionResponse> checkPermission($grpc.ServiceCall call, $0.CheckPermissionRequest request);
@@ -531,4 +578,6 @@ abstract class HubAdminServiceBase extends $grpc.Service {
   $async.Future<$0.ChannelStatusResponse> channelStatus($grpc.ServiceCall call, $1.Empty request);
   $async.Future<$0.SystemAiStatusResponse> systemAiStatus($grpc.ServiceCall call, $1.Empty request);
   $async.Future<$0.AskAiResponse> askAi($grpc.ServiceCall call, $0.AskAiRequest request);
+  $async.Future<$0.SystemAiStatusResponse> updateSystemAi($grpc.ServiceCall call, $0.UpdateSystemAiRequest request);
+  $async.Future<$0.AskAiResponse> testSystemAi($grpc.ServiceCall call, $1.Empty request);
 }

lib/src/generated/fai/v1/hub.pbjson.dart

@@ -716,3 +716,22 @@ final $typed_data.Uint8List askAiResponseDescriptor = $convert.base64Decode(
     'Cg1Bc2tBaVJlc3BvbnNlEh0KCmVycm9yX2tpbmQYASABKAlSCWVycm9yS2luZBISCgR0ZXh0GA'
     'IgASgJUgR0ZXh0Eh0KCmxhdGVuY3lfbXMYAyABKA1SCWxhdGVuY3lNcw==');
 
+@$core.Deprecated('Use updateSystemAiRequestDescriptor instead')
+const UpdateSystemAiRequest$json = {
+  '1': 'UpdateSystemAiRequest',
+  '2': [
+    {'1': 'provider', '3': 1, '4': 1, '5': 9, '10': 'provider'},
+    {'1': 'endpoint', '3': 2, '4': 1, '5': 9, '10': 'endpoint'},
+    {'1': 'model', '3': 3, '4': 1, '5': 9, '10': 'model'},
+    {'1': 'api_key_env', '3': 4, '4': 1, '5': 9, '10': 'apiKeyEnv'},
+    {'1': 'privacy_mode', '3': 5, '4': 1, '5': 9, '10': 'privacyMode'},
+  ],
+};
+
+/// Descriptor for `UpdateSystemAiRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List updateSystemAiRequestDescriptor = $convert.base64Decode(
+    'ChVVcGRhdGVTeXN0ZW1BaVJlcXVlc3QSGgoIcHJvdmlkZXIYASABKAlSCHByb3ZpZGVyEhoKCG'
+    'VuZHBvaW50GAIgASgJUghlbmRwb2ludBIUCgVtb2RlbBgDIAEoCVIFbW9kZWwSHgoLYXBpX2tl'
+    'eV9lbnYYBCABKAlSCWFwaUtleUVudhIhCgxwcml2YWN5X21vZGUYBSABKAlSC3ByaXZhY3lNb2'
+    'Rl');
+

lib/src/hub_client.dart

@@ -199,6 +199,32 @@ class HubClient {
     return _admin.askAi(pb.AskAiRequest(prompt: prompt));
   }
 
+  /// Persist a new System-AI configuration. Validates +
+  /// writes back to ~/.fai/config.yaml + hot-reloads the live
+  /// hub state in one call. Returns the resulting status so
+  /// the UI can refresh in one round-trip.
+  Future<SystemAiStatusResponse> updateSystemAi({
+    required String provider,
+    required String endpoint,
+    required String model,
+    required String apiKeyEnv,
+    required String privacyMode,
+  }) {
+    return _admin.updateSystemAi(pb.UpdateSystemAiRequest(
+      provider: provider,
+      endpoint: endpoint,
+      model: model,
+      apiKeyEnv: apiKeyEnv,
+      privacyMode: privacyMode,
+    ));
+  }
+
+  /// Probe the configured provider with a tiny ping. Same
+  /// error-kind taxonomy as [askAi].
+  Future<AskAiResponse> testSystemAi() {
+    return _admin.testSystemAi(Empty());
+  }
+
   /// Search the hub's bundled store index. All filters are
   /// optional; an empty query returns the first [limit] entries
   /// the index ships with.