feat: submitStreaming + detached-invocation client (T2/T3)

Regenerates the gRPC stubs from the updated proto and adds:
- HubClient.submitStreaming(...) -> Stream<SubmitStreamEvent>: follow a
  flow execution live (step markers, module emit-events, terminal
  result/error). Works over native gRPC and, on web, gRPC-Web (the
  same conditional channel factory the rest of the SDK uses).
- submit(..., detach: true) and getInvocationStatus /
  getInvocationResult / cancelInvocation wrappers (T3).
- SubmitStreamEvent + InvocationStatus re-exported as typedefs.

Shared _buildSubmitRequest between submit + submitStreaming. analyze
clean, tests pass.

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

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

@@ -82,10 +82,12 @@ class SubmitRequest extends $pb.GeneratedMessage {
   factory SubmitRequest({
     $core.List<$core.int>? flowYaml,
     $core.Iterable<$core.MapEntry<$core.String, $2.Payload>>? inputs,
+    $core.bool? detach,
   }) {
     final result = create();
     if (flowYaml != null) result.flowYaml = flowYaml;
     if (inputs != null) result.inputs.addEntries(inputs);
+    if (detach != null) result.detach = detach;
     return result;
   }
 
@@ -111,6 +113,7 @@ class SubmitRequest extends $pb.GeneratedMessage {
         valueCreator: $2.Payload.create,
         valueDefaultOrMaker: $2.Payload.getDefault,
         packageName: const $pb.PackageName('chain.v1'))
+    ..aOB(3, _omitFieldNames ? '' : 'detach')
     ..hasRequiredFields = false;
 
   @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
@@ -145,6 +148,20 @@ class SubmitRequest extends $pb.GeneratedMessage {
   /// Named input values for the flow.
   @$pb.TagNumber(2)
   $pb.PbMap<$core.String, $2.Payload> get inputs => $_getMap(1);
+
+  /// When true (added 1.1), Submit returns immediately with the
+  /// invocation id and the flow keeps running in the background. Poll
+  /// GetInvocationStatus / fetch GetInvocationResult, or follow it live
+  /// via SubmitStream. Only detached invocations are retained; unary
+  /// detach=false is unchanged (synchronous, stateless).
+  @$pb.TagNumber(3)
+  $core.bool get detach => $_getBF(2);
+  @$pb.TagNumber(3)
+  set detach($core.bool value) => $_setBool(2, value);
+  @$pb.TagNumber(3)
+  $core.bool hasDetach() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearDetach() => $_clearField(3);
 }
 
 class SubmitResponse extends $pb.GeneratedMessage {
@@ -217,6 +234,608 @@ class SubmitResponse extends $pb.GeneratedMessage {
   $pb.PbMap<$core.String, $2.Payload> get outputs => $_getMap(1);
 }
 
+enum SubmitStreamEvent_Event {
+  stepStarted,
+  stepFinished,
+  moduleEvent,
+  finalResult,
+  error,
+  notSet
+}
+
+/// One event in a SubmitStream (added 1.1). Exactly one field is set.
+class SubmitStreamEvent extends $pb.GeneratedMessage {
+  factory SubmitStreamEvent({
+    StepStarted? stepStarted,
+    StepFinished? stepFinished,
+    ModuleEvent? moduleEvent,
+    SubmitResponse? finalResult,
+    StreamError? error,
+  }) {
+    final result = create();
+    if (stepStarted != null) result.stepStarted = stepStarted;
+    if (stepFinished != null) result.stepFinished = stepFinished;
+    if (moduleEvent != null) result.moduleEvent = moduleEvent;
+    if (finalResult != null) result.finalResult = finalResult;
+    if (error != null) result.error = error;
+    return result;
+  }
+
+  SubmitStreamEvent._();
+
+  factory SubmitStreamEvent.fromBuffer($core.List<$core.int> data,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(data, registry);
+  factory SubmitStreamEvent.fromJson($core.String json,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(json, registry);
+
+  static const $core.Map<$core.int, SubmitStreamEvent_Event>
+      _SubmitStreamEvent_EventByTag = {
+    1: SubmitStreamEvent_Event.stepStarted,
+    2: SubmitStreamEvent_Event.stepFinished,
+    3: SubmitStreamEvent_Event.moduleEvent,
+    4: SubmitStreamEvent_Event.finalResult,
+    5: SubmitStreamEvent_Event.error,
+    0: SubmitStreamEvent_Event.notSet
+  };
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'SubmitStreamEvent',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'chain.v1'),
+      createEmptyInstance: create)
+    ..oo(0, [1, 2, 3, 4, 5])
+    ..aOM<StepStarted>(1, _omitFieldNames ? '' : 'stepStarted',
+        subBuilder: StepStarted.create)
+    ..aOM<StepFinished>(2, _omitFieldNames ? '' : 'stepFinished',
+        subBuilder: StepFinished.create)
+    ..aOM<ModuleEvent>(3, _omitFieldNames ? '' : 'moduleEvent',
+        subBuilder: ModuleEvent.create)
+    ..aOM<SubmitResponse>(4, _omitFieldNames ? '' : 'finalResult',
+        subBuilder: SubmitResponse.create)
+    ..aOM<StreamError>(5, _omitFieldNames ? '' : 'error',
+        subBuilder: StreamError.create)
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  SubmitStreamEvent clone() => deepCopy();
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  SubmitStreamEvent copyWith(void Function(SubmitStreamEvent) updates) =>
+      super.copyWith((message) => updates(message as SubmitStreamEvent))
+          as SubmitStreamEvent;
+
+  @$core.override
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static SubmitStreamEvent create() => SubmitStreamEvent._();
+  @$core.override
+  SubmitStreamEvent createEmptyInstance() => create();
+  @$core.pragma('dart2js:noInline')
+  static SubmitStreamEvent getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<SubmitStreamEvent>(create);
+  static SubmitStreamEvent? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  @$pb.TagNumber(2)
+  @$pb.TagNumber(3)
+  @$pb.TagNumber(4)
+  @$pb.TagNumber(5)
+  SubmitStreamEvent_Event whichEvent() =>
+      _SubmitStreamEvent_EventByTag[$_whichOneof(0)]!;
+  @$pb.TagNumber(1)
+  @$pb.TagNumber(2)
+  @$pb.TagNumber(3)
+  @$pb.TagNumber(4)
+  @$pb.TagNumber(5)
+  void clearEvent() => $_clearField($_whichOneof(0));
+
+  @$pb.TagNumber(1)
+  StepStarted get stepStarted => $_getN(0);
+  @$pb.TagNumber(1)
+  set stepStarted(StepStarted value) => $_setField(1, value);
+  @$pb.TagNumber(1)
+  $core.bool hasStepStarted() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearStepStarted() => $_clearField(1);
+  @$pb.TagNumber(1)
+  StepStarted ensureStepStarted() => $_ensure(0);
+
+  @$pb.TagNumber(2)
+  StepFinished get stepFinished => $_getN(1);
+  @$pb.TagNumber(2)
+  set stepFinished(StepFinished value) => $_setField(2, value);
+  @$pb.TagNumber(2)
+  $core.bool hasStepFinished() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearStepFinished() => $_clearField(2);
+  @$pb.TagNumber(2)
+  StepFinished ensureStepFinished() => $_ensure(1);
+
+  @$pb.TagNumber(3)
+  ModuleEvent get moduleEvent => $_getN(2);
+  @$pb.TagNumber(3)
+  set moduleEvent(ModuleEvent value) => $_setField(3, value);
+  @$pb.TagNumber(3)
+  $core.bool hasModuleEvent() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearModuleEvent() => $_clearField(3);
+  @$pb.TagNumber(3)
+  ModuleEvent ensureModuleEvent() => $_ensure(2);
+
+  /// Terminal success — identical to the unary SubmitResponse.
+  @$pb.TagNumber(4)
+  SubmitResponse get finalResult => $_getN(3);
+  @$pb.TagNumber(4)
+  set finalResult(SubmitResponse value) => $_setField(4, value);
+  @$pb.TagNumber(4)
+  $core.bool hasFinalResult() => $_has(3);
+  @$pb.TagNumber(4)
+  void clearFinalResult() => $_clearField(4);
+  @$pb.TagNumber(4)
+  SubmitResponse ensureFinalResult() => $_ensure(3);
+
+  /// Terminal failure — the flow (or a step) errored.
+  @$pb.TagNumber(5)
+  StreamError get error => $_getN(4);
+  @$pb.TagNumber(5)
+  set error(StreamError value) => $_setField(5, value);
+  @$pb.TagNumber(5)
+  $core.bool hasError() => $_has(4);
+  @$pb.TagNumber(5)
+  void clearError() => $_clearField(5);
+  @$pb.TagNumber(5)
+  StreamError ensureError() => $_ensure(4);
+}
+
+class StepStarted extends $pb.GeneratedMessage {
+  factory StepStarted({
+    $core.String? step,
+    $core.String? capability,
+  }) {
+    final result = create();
+    if (step != null) result.step = step;
+    if (capability != null) result.capability = capability;
+    return result;
+  }
+
+  StepStarted._();
+
+  factory StepStarted.fromBuffer($core.List<$core.int> data,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(data, registry);
+  factory StepStarted.fromJson($core.String json,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(json, registry);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'StepStarted',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'chain.v1'),
+      createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'step')
+    ..aOS(2, _omitFieldNames ? '' : 'capability')
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  StepStarted clone() => deepCopy();
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  StepStarted copyWith(void Function(StepStarted) updates) =>
+      super.copyWith((message) => updates(message as StepStarted))
+          as StepStarted;
+
+  @$core.override
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static StepStarted create() => StepStarted._();
+  @$core.override
+  StepStarted createEmptyInstance() => create();
+  @$core.pragma('dart2js:noInline')
+  static StepStarted getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<StepStarted>(create);
+  static StepStarted? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.String get step => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set step($core.String value) => $_setString(0, value);
+  @$pb.TagNumber(1)
+  $core.bool hasStep() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearStep() => $_clearField(1);
+
+  /// Capability the step resolved to, e.g. "text.extract".
+  @$pb.TagNumber(2)
+  $core.String get capability => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set capability($core.String value) => $_setString(1, value);
+  @$pb.TagNumber(2)
+  $core.bool hasCapability() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearCapability() => $_clearField(2);
+}
+
+class StepFinished extends $pb.GeneratedMessage {
+  factory StepFinished({
+    $core.String? step,
+    $core.bool? ok,
+    $fixnum.Int64? durationMs,
+  }) {
+    final result = create();
+    if (step != null) result.step = step;
+    if (ok != null) result.ok = ok;
+    if (durationMs != null) result.durationMs = durationMs;
+    return result;
+  }
+
+  StepFinished._();
+
+  factory StepFinished.fromBuffer($core.List<$core.int> data,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(data, registry);
+  factory StepFinished.fromJson($core.String json,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(json, registry);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'StepFinished',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'chain.v1'),
+      createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'step')
+    ..aOB(2, _omitFieldNames ? '' : 'ok')
+    ..aInt64(3, _omitFieldNames ? '' : 'durationMs')
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  StepFinished clone() => deepCopy();
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  StepFinished copyWith(void Function(StepFinished) updates) =>
+      super.copyWith((message) => updates(message as StepFinished))
+          as StepFinished;
+
+  @$core.override
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static StepFinished create() => StepFinished._();
+  @$core.override
+  StepFinished createEmptyInstance() => create();
+  @$core.pragma('dart2js:noInline')
+  static StepFinished getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<StepFinished>(create);
+  static StepFinished? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.String get step => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set step($core.String value) => $_setString(0, value);
+  @$pb.TagNumber(1)
+  $core.bool hasStep() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearStep() => $_clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.bool get ok => $_getBF(1);
+  @$pb.TagNumber(2)
+  set ok($core.bool value) => $_setBool(1, value);
+  @$pb.TagNumber(2)
+  $core.bool hasOk() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearOk() => $_clearField(2);
+
+  @$pb.TagNumber(3)
+  $fixnum.Int64 get durationMs => $_getI64(2);
+  @$pb.TagNumber(3)
+  set durationMs($fixnum.Int64 value) => $_setInt64(2, value);
+  @$pb.TagNumber(3)
+  $core.bool hasDurationMs() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearDurationMs() => $_clearField(3);
+}
+
+/// An ephemeral event a module emitted via host.emit-event (WIT 1.1).
+/// Never written to the audit log.
+class ModuleEvent extends $pb.GeneratedMessage {
+  factory ModuleEvent({
+    $core.String? step,
+    $core.String? name,
+    $2.Payload? payload,
+  }) {
+    final result = create();
+    if (step != null) result.step = step;
+    if (name != null) result.name = name;
+    if (payload != null) result.payload = payload;
+    return result;
+  }
+
+  ModuleEvent._();
+
+  factory ModuleEvent.fromBuffer($core.List<$core.int> data,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(data, registry);
+  factory ModuleEvent.fromJson($core.String json,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(json, registry);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'ModuleEvent',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'chain.v1'),
+      createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'step')
+    ..aOS(2, _omitFieldNames ? '' : 'name')
+    ..aOM<$2.Payload>(3, _omitFieldNames ? '' : 'payload',
+        subBuilder: $2.Payload.create)
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  ModuleEvent clone() => deepCopy();
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  ModuleEvent copyWith(void Function(ModuleEvent) updates) =>
+      super.copyWith((message) => updates(message as ModuleEvent))
+          as ModuleEvent;
+
+  @$core.override
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static ModuleEvent create() => ModuleEvent._();
+  @$core.override
+  ModuleEvent createEmptyInstance() => create();
+  @$core.pragma('dart2js:noInline')
+  static ModuleEvent getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<ModuleEvent>(create);
+  static ModuleEvent? _defaultInstance;
+
+  /// The step whose module emitted this.
+  @$pb.TagNumber(1)
+  $core.String get step => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set step($core.String value) => $_setString(0, value);
+  @$pb.TagNumber(1)
+  $core.bool hasStep() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearStep() => $_clearField(1);
+
+  /// Module-defined label, e.g. "progress" / "token".
+  @$pb.TagNumber(2)
+  $core.String get name => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set name($core.String value) => $_setString(1, value);
+  @$pb.TagNumber(2)
+  $core.bool hasName() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearName() => $_clearField(2);
+
+  /// Event body.
+  @$pb.TagNumber(3)
+  $2.Payload get payload => $_getN(2);
+  @$pb.TagNumber(3)
+  set payload($2.Payload value) => $_setField(3, value);
+  @$pb.TagNumber(3)
+  $core.bool hasPayload() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearPayload() => $_clearField(3);
+  @$pb.TagNumber(3)
+  $2.Payload ensurePayload() => $_ensure(2);
+}
+
+class StreamError extends $pb.GeneratedMessage {
+  factory StreamError({
+    $core.String? message,
+  }) {
+    final result = create();
+    if (message != null) result.message = message;
+    return result;
+  }
+
+  StreamError._();
+
+  factory StreamError.fromBuffer($core.List<$core.int> data,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(data, registry);
+  factory StreamError.fromJson($core.String json,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(json, registry);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'StreamError',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'chain.v1'),
+      createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'message')
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  StreamError clone() => deepCopy();
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  StreamError copyWith(void Function(StreamError) updates) =>
+      super.copyWith((message) => updates(message as StreamError))
+          as StreamError;
+
+  @$core.override
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static StreamError create() => StreamError._();
+  @$core.override
+  StreamError createEmptyInstance() => create();
+  @$core.pragma('dart2js:noInline')
+  static StreamError getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<StreamError>(create);
+  static StreamError? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.String get message => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set message($core.String value) => $_setString(0, value);
+  @$pb.TagNumber(1)
+  $core.bool hasMessage() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearMessage() => $_clearField(1);
+}
+
+/// Lifecycle of a detached invocation (added 1.1).
+class InvocationStatus extends $pb.GeneratedMessage {
+  factory InvocationStatus({
+    InvocationStatus_Phase? phase,
+    $core.String? currentStep,
+    $core.String? startedAt,
+    $core.String? finishedAt,
+    $core.String? error,
+  }) {
+    final result = create();
+    if (phase != null) result.phase = phase;
+    if (currentStep != null) result.currentStep = currentStep;
+    if (startedAt != null) result.startedAt = startedAt;
+    if (finishedAt != null) result.finishedAt = finishedAt;
+    if (error != null) result.error = error;
+    return result;
+  }
+
+  InvocationStatus._();
+
+  factory InvocationStatus.fromBuffer($core.List<$core.int> data,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(data, registry);
+  factory InvocationStatus.fromJson($core.String json,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(json, registry);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'InvocationStatus',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'chain.v1'),
+      createEmptyInstance: create)
+    ..aE<InvocationStatus_Phase>(1, _omitFieldNames ? '' : 'phase',
+        enumValues: InvocationStatus_Phase.values)
+    ..aOS(2, _omitFieldNames ? '' : 'currentStep')
+    ..aOS(3, _omitFieldNames ? '' : 'startedAt')
+    ..aOS(4, _omitFieldNames ? '' : 'finishedAt')
+    ..aOS(5, _omitFieldNames ? '' : 'error')
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  InvocationStatus clone() => deepCopy();
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  InvocationStatus copyWith(void Function(InvocationStatus) updates) =>
+      super.copyWith((message) => updates(message as InvocationStatus))
+          as InvocationStatus;
+
+  @$core.override
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static InvocationStatus create() => InvocationStatus._();
+  @$core.override
+  InvocationStatus createEmptyInstance() => create();
+  @$core.pragma('dart2js:noInline')
+  static InvocationStatus getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<InvocationStatus>(create);
+  static InvocationStatus? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  InvocationStatus_Phase get phase => $_getN(0);
+  @$pb.TagNumber(1)
+  set phase(InvocationStatus_Phase value) => $_setField(1, value);
+  @$pb.TagNumber(1)
+  $core.bool hasPhase() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearPhase() => $_clearField(1);
+
+  /// Step currently executing (RUNNING), empty otherwise.
+  @$pb.TagNumber(2)
+  $core.String get currentStep => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set currentStep($core.String value) => $_setString(1, value);
+  @$pb.TagNumber(2)
+  $core.bool hasCurrentStep() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearCurrentStep() => $_clearField(2);
+
+  /// RFC 3339 timestamps; finished_at empty until the flow ends.
+  @$pb.TagNumber(3)
+  $core.String get startedAt => $_getSZ(2);
+  @$pb.TagNumber(3)
+  set startedAt($core.String value) => $_setString(2, value);
+  @$pb.TagNumber(3)
+  $core.bool hasStartedAt() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearStartedAt() => $_clearField(3);
+
+  @$pb.TagNumber(4)
+  $core.String get finishedAt => $_getSZ(3);
+  @$pb.TagNumber(4)
+  set finishedAt($core.String value) => $_setString(3, value);
+  @$pb.TagNumber(4)
+  $core.bool hasFinishedAt() => $_has(3);
+  @$pb.TagNumber(4)
+  void clearFinishedAt() => $_clearField(4);
+
+  /// Error message when phase == FAILED, empty otherwise.
+  @$pb.TagNumber(5)
+  $core.String get error => $_getSZ(4);
+  @$pb.TagNumber(5)
+  set error($core.String value) => $_setString(4, value);
+  @$pb.TagNumber(5)
+  $core.bool hasError() => $_has(4);
+  @$pb.TagNumber(5)
+  void clearError() => $_clearField(5);
+}
+
+class CancelInvocationResponse extends $pb.GeneratedMessage {
+  factory CancelInvocationResponse({
+    $core.bool? cancelled,
+  }) {
+    final result = create();
+    if (cancelled != null) result.cancelled = cancelled;
+    return result;
+  }
+
+  CancelInvocationResponse._();
+
+  factory CancelInvocationResponse.fromBuffer($core.List<$core.int> data,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(data, registry);
+  factory CancelInvocationResponse.fromJson($core.String json,
+          [$pb.ExtensionRegistry registry = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(json, registry);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'CancelInvocationResponse',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'chain.v1'),
+      createEmptyInstance: create)
+    ..aOB(1, _omitFieldNames ? '' : 'cancelled')
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  CancelInvocationResponse clone() => deepCopy();
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  CancelInvocationResponse copyWith(
+          void Function(CancelInvocationResponse) updates) =>
+      super.copyWith((message) => updates(message as CancelInvocationResponse))
+          as CancelInvocationResponse;
+
+  @$core.override
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static CancelInvocationResponse create() => CancelInvocationResponse._();
+  @$core.override
+  CancelInvocationResponse createEmptyInstance() => create();
+  @$core.pragma('dart2js:noInline')
+  static CancelInvocationResponse getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<CancelInvocationResponse>(create);
+  static CancelInvocationResponse? _defaultInstance;
+
+  /// True if a running invocation was signalled to cancel; false if it
+  /// was already finished or unknown.
+  @$pb.TagNumber(1)
+  $core.bool get cancelled => $_getBF(0);
+  @$pb.TagNumber(1)
+  set cancelled($core.bool value) => $_setBool(0, value);
+  @$pb.TagNumber(1)
+  $core.bool hasCancelled() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearCancelled() => $_clearField(1);
+}
+
 class ModuleList extends $pb.GeneratedMessage {
   factory ModuleList({
     $core.Iterable<ModuleSummary>? modules,
@@ -3988,6 +4607,7 @@ class StoreEntry extends $pb.GeneratedMessage {
     $core.String? kind,
     $core.String? provider,
     $core.String? sourceKind,
+    $core.String? source,
   }) {
     final result = create();
     if (name != null) result.name = name;
@@ -4013,6 +4633,7 @@ class StoreEntry extends $pb.GeneratedMessage {
     if (kind != null) result.kind = kind;
     if (provider != null) result.provider = provider;
     if (sourceKind != null) result.sourceKind = sourceKind;
+    if (source != null) result.source = source;
     return result;
   }
 
@@ -4050,6 +4671,7 @@ class StoreEntry extends $pb.GeneratedMessage {
     ..aOS(19, _omitFieldNames ? '' : 'kind')
     ..aOS(20, _omitFieldNames ? '' : 'provider')
     ..aOS(21, _omitFieldNames ? '' : 'sourceKind')
+    ..aOS(22, _omitFieldNames ? '' : 'source')
     ..hasRequiredFields = false;
 
   @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
@@ -4271,6 +4893,19 @@ class StoreEntry extends $pb.GeneratedMessage {
   $core.bool hasSourceKind() => $_has(20);
   @$pb.TagNumber(21)
   void clearSourceKind() => $_clearField(21);
+
+  /// Name of the store this entry was loaded from: "bundled" for the
+  /// built-in seed, otherwise the operator-added store's name. Distinct
+  /// from source_kind (the transport) — this is the ORIGIN store. Studio
+  /// groups modules by it and shows a "from <store>" label.
+  @$pb.TagNumber(22)
+  $core.String get source => $_getSZ(21);
+  @$pb.TagNumber(22)
+  set source($core.String value) => $_setString(21, value);
+  @$pb.TagNumber(22)
+  $core.bool hasSource() => $_has(21);
+  @$pb.TagNumber(22)
+  void clearSource() => $_clearField(22);
 }
 
 class ChannelStatusResponse extends $pb.GeneratedMessage {

lib/src/generated/chain/v1/hub.pbenum.dart

@@ -14,6 +14,38 @@ import 'dart:core' as $core;
 
 import 'package:protobuf/protobuf.dart' as $pb;
 
+class InvocationStatus_Phase extends $pb.ProtobufEnum {
+  static const InvocationStatus_Phase PHASE_UNKNOWN =
+      InvocationStatus_Phase._(0, _omitEnumNames ? '' : 'PHASE_UNKNOWN');
+  static const InvocationStatus_Phase PENDING =
+      InvocationStatus_Phase._(1, _omitEnumNames ? '' : 'PENDING');
+  static const InvocationStatus_Phase RUNNING =
+      InvocationStatus_Phase._(2, _omitEnumNames ? '' : 'RUNNING');
+  static const InvocationStatus_Phase SUCCEEDED =
+      InvocationStatus_Phase._(3, _omitEnumNames ? '' : 'SUCCEEDED');
+  static const InvocationStatus_Phase FAILED =
+      InvocationStatus_Phase._(4, _omitEnumNames ? '' : 'FAILED');
+  static const InvocationStatus_Phase CANCELLED =
+      InvocationStatus_Phase._(5, _omitEnumNames ? '' : 'CANCELLED');
+
+  static const $core.List<InvocationStatus_Phase> values =
+      <InvocationStatus_Phase>[
+    PHASE_UNKNOWN,
+    PENDING,
+    RUNNING,
+    SUCCEEDED,
+    FAILED,
+    CANCELLED,
+  ];
+
+  static final $core.List<InvocationStatus_Phase?> _byValue =
+      $pb.ProtobufEnum.$_initByValueList(values, 5);
+  static InvocationStatus_Phase? valueOf($core.int value) =>
+      value < 0 || value >= _byValue.length ? null : _byValue[value];
+
+  const InvocationStatus_Phase._(super.value, super.name);
+}
+
 class HealthStatus_State extends $pb.ProtobufEnum {
   static const HealthStatus_State UNKNOWN =
       HealthStatus_State._(0, _omitEnumNames ? '' : 'UNKNOWN');

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

@@ -17,6 +17,7 @@ import 'package:grpc/service_api.dart' as $grpc;
 import 'package:protobuf/protobuf.dart' as $pb;
 import 'package:protobuf/well_known_types/google/protobuf/empty.pb.dart' as $1;
 
+import 'common.pb.dart' as $2;
 import 'hub.pb.dart' as $0;
 
 export 'hub.pb.dart';
@@ -42,6 +43,20 @@ class HubClient extends $grpc.Client {
     return $createUnaryCall(_$submit, request, options: options);
   }
 
+  /// Submit a flow and follow its execution live (added 1.1). Same
+  /// request as unary Submit; the response is a stream of step markers,
+  /// ephemeral module events (host.emit-event), and finally the result
+  /// or an error. Works over native gRPC and gRPC-Web (server
+  /// streaming). Unary Submit is unchanged for clients that don't care.
+  $grpc.ResponseStream<$0.SubmitStreamEvent> submitStream(
+    $0.SubmitRequest request, {
+    $grpc.CallOptions? options,
+  }) {
+    return $createStreamingCall(
+        _$submitStream, $async.Stream.fromIterable([request]),
+        options: options);
+  }
+
   /// List modules known to this hub.
   $grpc.ResponseFuture<$0.ModuleList> listModules(
     $1.Empty request, {
@@ -50,6 +65,31 @@ class HubClient extends $grpc.Client {
     return $createUnaryCall(_$listModules, request, options: options);
   }
 
+  /// Detached-invocation lifecycle (added 1.1). Only invocations
+  /// submitted with detach=true are tracked; results are retained under
+  /// hard operator limits (size/count/TTL) and NOT persisted across a
+  /// hub restart.
+  $grpc.ResponseFuture<$0.InvocationStatus> getInvocationStatus(
+    $2.InvocationId request, {
+    $grpc.CallOptions? options,
+  }) {
+    return $createUnaryCall(_$getInvocationStatus, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.SubmitResponse> getInvocationResult(
+    $2.InvocationId request, {
+    $grpc.CallOptions? options,
+  }) {
+    return $createUnaryCall(_$getInvocationResult, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.CancelInvocationResponse> cancelInvocation(
+    $2.InvocationId request, {
+    $grpc.CallOptions? options,
+  }) {
+    return $createUnaryCall(_$cancelInvocation, request, options: options);
+  }
+
   /// Liveness / readiness probe.
   $grpc.ResponseFuture<$0.HealthStatus> health(
     $1.Empty request, {
@@ -65,10 +105,30 @@ class HubClient extends $grpc.Client {
           '/chain.v1.Hub/Submit',
           ($0.SubmitRequest value) => value.writeToBuffer(),
           $0.SubmitResponse.fromBuffer);
+  static final _$submitStream =
+      $grpc.ClientMethod<$0.SubmitRequest, $0.SubmitStreamEvent>(
+          '/chain.v1.Hub/SubmitStream',
+          ($0.SubmitRequest value) => value.writeToBuffer(),
+          $0.SubmitStreamEvent.fromBuffer);
   static final _$listModules = $grpc.ClientMethod<$1.Empty, $0.ModuleList>(
       '/chain.v1.Hub/ListModules',
       ($1.Empty value) => value.writeToBuffer(),
       $0.ModuleList.fromBuffer);
+  static final _$getInvocationStatus =
+      $grpc.ClientMethod<$2.InvocationId, $0.InvocationStatus>(
+          '/chain.v1.Hub/GetInvocationStatus',
+          ($2.InvocationId value) => value.writeToBuffer(),
+          $0.InvocationStatus.fromBuffer);
+  static final _$getInvocationResult =
+      $grpc.ClientMethod<$2.InvocationId, $0.SubmitResponse>(
+          '/chain.v1.Hub/GetInvocationResult',
+          ($2.InvocationId value) => value.writeToBuffer(),
+          $0.SubmitResponse.fromBuffer);
+  static final _$cancelInvocation =
+      $grpc.ClientMethod<$2.InvocationId, $0.CancelInvocationResponse>(
+          '/chain.v1.Hub/CancelInvocation',
+          ($2.InvocationId value) => value.writeToBuffer(),
+          $0.CancelInvocationResponse.fromBuffer);
   static final _$health = $grpc.ClientMethod<$1.Empty, $0.HealthStatus>(
       '/chain.v1.Hub/Health',
       ($1.Empty value) => value.writeToBuffer(),
@@ -87,6 +147,13 @@ abstract class HubServiceBase extends $grpc.Service {
         false,
         ($core.List<$core.int> value) => $0.SubmitRequest.fromBuffer(value),
         ($0.SubmitResponse value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.SubmitRequest, $0.SubmitStreamEvent>(
+        'SubmitStream',
+        submitStream_Pre,
+        false,
+        true,
+        ($core.List<$core.int> value) => $0.SubmitRequest.fromBuffer(value),
+        ($0.SubmitStreamEvent value) => value.writeToBuffer()));
     $addMethod($grpc.ServiceMethod<$1.Empty, $0.ModuleList>(
         'ListModules',
         listModules_Pre,
@@ -94,6 +161,28 @@ abstract class HubServiceBase extends $grpc.Service {
         false,
         ($core.List<$core.int> value) => $1.Empty.fromBuffer(value),
         ($0.ModuleList value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$2.InvocationId, $0.InvocationStatus>(
+        'GetInvocationStatus',
+        getInvocationStatus_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $2.InvocationId.fromBuffer(value),
+        ($0.InvocationStatus value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$2.InvocationId, $0.SubmitResponse>(
+        'GetInvocationResult',
+        getInvocationResult_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $2.InvocationId.fromBuffer(value),
+        ($0.SubmitResponse value) => value.writeToBuffer()));
+    $addMethod(
+        $grpc.ServiceMethod<$2.InvocationId, $0.CancelInvocationResponse>(
+            'CancelInvocation',
+            cancelInvocation_Pre,
+            false,
+            false,
+            ($core.List<$core.int> value) => $2.InvocationId.fromBuffer(value),
+            ($0.CancelInvocationResponse value) => value.writeToBuffer()));
     $addMethod($grpc.ServiceMethod<$1.Empty, $0.HealthStatus>(
         'Health',
         health_Pre,
@@ -111,6 +200,14 @@ abstract class HubServiceBase extends $grpc.Service {
   $async.Future<$0.SubmitResponse> submit(
       $grpc.ServiceCall call, $0.SubmitRequest request);
 
+  $async.Stream<$0.SubmitStreamEvent> submitStream_Pre($grpc.ServiceCall $call,
+      $async.Future<$0.SubmitRequest> $request) async* {
+    yield* submitStream($call, await $request);
+  }
+
+  $async.Stream<$0.SubmitStreamEvent> submitStream(
+      $grpc.ServiceCall call, $0.SubmitRequest request);
+
   $async.Future<$0.ModuleList> listModules_Pre(
       $grpc.ServiceCall $call, $async.Future<$1.Empty> $request) async {
     return listModules($call, await $request);
@@ -119,6 +216,30 @@ abstract class HubServiceBase extends $grpc.Service {
   $async.Future<$0.ModuleList> listModules(
       $grpc.ServiceCall call, $1.Empty request);
 
+  $async.Future<$0.InvocationStatus> getInvocationStatus_Pre(
+      $grpc.ServiceCall $call, $async.Future<$2.InvocationId> $request) async {
+    return getInvocationStatus($call, await $request);
+  }
+
+  $async.Future<$0.InvocationStatus> getInvocationStatus(
+      $grpc.ServiceCall call, $2.InvocationId request);
+
+  $async.Future<$0.SubmitResponse> getInvocationResult_Pre(
+      $grpc.ServiceCall $call, $async.Future<$2.InvocationId> $request) async {
+    return getInvocationResult($call, await $request);
+  }
+
+  $async.Future<$0.SubmitResponse> getInvocationResult(
+      $grpc.ServiceCall call, $2.InvocationId request);
+
+  $async.Future<$0.CancelInvocationResponse> cancelInvocation_Pre(
+      $grpc.ServiceCall $call, $async.Future<$2.InvocationId> $request) async {
+    return cancelInvocation($call, await $request);
+  }
+
+  $async.Future<$0.CancelInvocationResponse> cancelInvocation(
+      $grpc.ServiceCall call, $2.InvocationId request);
+
   $async.Future<$0.HealthStatus> health_Pre(
       $grpc.ServiceCall $call, $async.Future<$1.Empty> $request) async {
     return health($call, await $request);

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

@@ -41,6 +41,7 @@ const SubmitRequest$json = {
       '6': '.chain.v1.SubmitRequest.InputsEntry',
       '10': 'inputs'
     },
+    {'1': 'detach', '3': 3, '4': 1, '5': 8, '10': 'detach'},
   ],
   '3': [SubmitRequest_InputsEntry$json],
 };
@@ -65,9 +66,9 @@ const SubmitRequest_InputsEntry$json = {
 /// Descriptor for `SubmitRequest`. Decode as a `google.protobuf.DescriptorProto`.
 final $typed_data.Uint8List submitRequestDescriptor = $convert.base64Decode(
     'Cg1TdWJtaXRSZXF1ZXN0EhsKCWZsb3dfeWFtbBgBIAEoDFIIZmxvd1lhbWwSOwoGaW5wdXRzGA'
-    'IgAygLMiMuY2hhaW4udjEuU3VibWl0UmVxdWVzdC5JbnB1dHNFbnRyeVIGaW5wdXRzGkwKC0lu'
+    'IgAygLMiMuY2hhaW4udjEuU3VibWl0UmVxdWVzdC5JbnB1dHNFbnRyeVIGaW5wdXRzEhYKBmRl'
-    'cHV0c0VudHJ5EhAKA2tleRgBIAEoCVIDa2V5EicKBXZhbHVlGAIgASgLMhEuY2hhaW4udjEuUG'
+    'dGFjaBgDIAEoCFIGZGV0YWNoGkwKC0lucHV0c0VudHJ5EhAKA2tleRgBIAEoCVIDa2V5EicKBX'
-    'F5bG9hZFIFdmFsdWU6AjgB');
+    'ZhbHVlGAIgASgLMhEuY2hhaW4udjEuUGF5bG9hZFIFdmFsdWU6AjgB');
 
 @$core.Deprecated('Use submitResponseDescriptor instead')
 const SubmitResponse$json = {
@@ -117,6 +118,189 @@ final $typed_data.Uint8List submitResponseDescriptor = $convert.base64Decode(
     'dFJlc3BvbnNlLk91dHB1dHNFbnRyeVIHb3V0cHV0cxpNCgxPdXRwdXRzRW50cnkSEAoDa2V5GA'
     'EgASgJUgNrZXkSJwoFdmFsdWUYAiABKAsyES5jaGFpbi52MS5QYXlsb2FkUgV2YWx1ZToCOAE=');
 
+@$core.Deprecated('Use submitStreamEventDescriptor instead')
+const SubmitStreamEvent$json = {
+  '1': 'SubmitStreamEvent',
+  '2': [
+    {
+      '1': 'step_started',
+      '3': 1,
+      '4': 1,
+      '5': 11,
+      '6': '.chain.v1.StepStarted',
+      '9': 0,
+      '10': 'stepStarted'
+    },
+    {
+      '1': 'step_finished',
+      '3': 2,
+      '4': 1,
+      '5': 11,
+      '6': '.chain.v1.StepFinished',
+      '9': 0,
+      '10': 'stepFinished'
+    },
+    {
+      '1': 'module_event',
+      '3': 3,
+      '4': 1,
+      '5': 11,
+      '6': '.chain.v1.ModuleEvent',
+      '9': 0,
+      '10': 'moduleEvent'
+    },
+    {
+      '1': 'final_result',
+      '3': 4,
+      '4': 1,
+      '5': 11,
+      '6': '.chain.v1.SubmitResponse',
+      '9': 0,
+      '10': 'finalResult'
+    },
+    {
+      '1': 'error',
+      '3': 5,
+      '4': 1,
+      '5': 11,
+      '6': '.chain.v1.StreamError',
+      '9': 0,
+      '10': 'error'
+    },
+  ],
+  '8': [
+    {'1': 'event'},
+  ],
+};
+
+/// Descriptor for `SubmitStreamEvent`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List submitStreamEventDescriptor = $convert.base64Decode(
+    'ChFTdWJtaXRTdHJlYW1FdmVudBI6CgxzdGVwX3N0YXJ0ZWQYASABKAsyFS5jaGFpbi52MS5TdG'
+    'VwU3RhcnRlZEgAUgtzdGVwU3RhcnRlZBI9Cg1zdGVwX2ZpbmlzaGVkGAIgASgLMhYuY2hhaW4u'
+    'djEuU3RlcEZpbmlzaGVkSABSDHN0ZXBGaW5pc2hlZBI6Cgxtb2R1bGVfZXZlbnQYAyABKAsyFS'
+    '5jaGFpbi52MS5Nb2R1bGVFdmVudEgAUgttb2R1bGVFdmVudBI9CgxmaW5hbF9yZXN1bHQYBCAB'
+    'KAsyGC5jaGFpbi52MS5TdWJtaXRSZXNwb25zZUgAUgtmaW5hbFJlc3VsdBItCgVlcnJvchgFIA'
+    'EoCzIVLmNoYWluLnYxLlN0cmVhbUVycm9ySABSBWVycm9yQgcKBWV2ZW50');
+
+@$core.Deprecated('Use stepStartedDescriptor instead')
+const StepStarted$json = {
+  '1': 'StepStarted',
+  '2': [
+    {'1': 'step', '3': 1, '4': 1, '5': 9, '10': 'step'},
+    {'1': 'capability', '3': 2, '4': 1, '5': 9, '10': 'capability'},
+  ],
+};
+
+/// Descriptor for `StepStarted`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List stepStartedDescriptor = $convert.base64Decode(
+    'CgtTdGVwU3RhcnRlZBISCgRzdGVwGAEgASgJUgRzdGVwEh4KCmNhcGFiaWxpdHkYAiABKAlSCm'
+    'NhcGFiaWxpdHk=');
+
+@$core.Deprecated('Use stepFinishedDescriptor instead')
+const StepFinished$json = {
+  '1': 'StepFinished',
+  '2': [
+    {'1': 'step', '3': 1, '4': 1, '5': 9, '10': 'step'},
+    {'1': 'ok', '3': 2, '4': 1, '5': 8, '10': 'ok'},
+    {'1': 'duration_ms', '3': 3, '4': 1, '5': 3, '10': 'durationMs'},
+  ],
+};
+
+/// Descriptor for `StepFinished`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List stepFinishedDescriptor = $convert.base64Decode(
+    'CgxTdGVwRmluaXNoZWQSEgoEc3RlcBgBIAEoCVIEc3RlcBIOCgJvaxgCIAEoCFICb2sSHwoLZH'
+    'VyYXRpb25fbXMYAyABKANSCmR1cmF0aW9uTXM=');
+
+@$core.Deprecated('Use moduleEventDescriptor instead')
+const ModuleEvent$json = {
+  '1': 'ModuleEvent',
+  '2': [
+    {'1': 'step', '3': 1, '4': 1, '5': 9, '10': 'step'},
+    {'1': 'name', '3': 2, '4': 1, '5': 9, '10': 'name'},
+    {
+      '1': 'payload',
+      '3': 3,
+      '4': 1,
+      '5': 11,
+      '6': '.chain.v1.Payload',
+      '10': 'payload'
+    },
+  ],
+};
+
+/// Descriptor for `ModuleEvent`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List moduleEventDescriptor = $convert.base64Decode(
+    'CgtNb2R1bGVFdmVudBISCgRzdGVwGAEgASgJUgRzdGVwEhIKBG5hbWUYAiABKAlSBG5hbWUSKw'
+    'oHcGF5bG9hZBgDIAEoCzIRLmNoYWluLnYxLlBheWxvYWRSB3BheWxvYWQ=');
+
+@$core.Deprecated('Use streamErrorDescriptor instead')
+const StreamError$json = {
+  '1': 'StreamError',
+  '2': [
+    {'1': 'message', '3': 1, '4': 1, '5': 9, '10': 'message'},
+  ],
+};
+
+/// Descriptor for `StreamError`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List streamErrorDescriptor = $convert
+    .base64Decode('CgtTdHJlYW1FcnJvchIYCgdtZXNzYWdlGAEgASgJUgdtZXNzYWdl');
+
+@$core.Deprecated('Use invocationStatusDescriptor instead')
+const InvocationStatus$json = {
+  '1': 'InvocationStatus',
+  '2': [
+    {
+      '1': 'phase',
+      '3': 1,
+      '4': 1,
+      '5': 14,
+      '6': '.chain.v1.InvocationStatus.Phase',
+      '10': 'phase'
+    },
+    {'1': 'current_step', '3': 2, '4': 1, '5': 9, '10': 'currentStep'},
+    {'1': 'started_at', '3': 3, '4': 1, '5': 9, '10': 'startedAt'},
+    {'1': 'finished_at', '3': 4, '4': 1, '5': 9, '10': 'finishedAt'},
+    {'1': 'error', '3': 5, '4': 1, '5': 9, '10': 'error'},
+  ],
+  '4': [InvocationStatus_Phase$json],
+};
+
+@$core.Deprecated('Use invocationStatusDescriptor instead')
+const InvocationStatus_Phase$json = {
+  '1': 'Phase',
+  '2': [
+    {'1': 'PHASE_UNKNOWN', '2': 0},
+    {'1': 'PENDING', '2': 1},
+    {'1': 'RUNNING', '2': 2},
+    {'1': 'SUCCEEDED', '2': 3},
+    {'1': 'FAILED', '2': 4},
+    {'1': 'CANCELLED', '2': 5},
+  ],
+};
+
+/// Descriptor for `InvocationStatus`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List invocationStatusDescriptor = $convert.base64Decode(
+    'ChBJbnZvY2F0aW9uU3RhdHVzEjYKBXBoYXNlGAEgASgOMiAuY2hhaW4udjEuSW52b2NhdGlvbl'
+    'N0YXR1cy5QaGFzZVIFcGhhc2USIQoMY3VycmVudF9zdGVwGAIgASgJUgtjdXJyZW50U3RlcBId'
+    'CgpzdGFydGVkX2F0GAMgASgJUglzdGFydGVkQXQSHwoLZmluaXNoZWRfYXQYBCABKAlSCmZpbm'
+    'lzaGVkQXQSFAoFZXJyb3IYBSABKAlSBWVycm9yIl4KBVBoYXNlEhEKDVBIQVNFX1VOS05PV04Q'
+    'ABILCgdQRU5ESU5HEAESCwoHUlVOTklORxACEg0KCVNVQ0NFRURFRBADEgoKBkZBSUxFRBAEEg'
+    '0KCUNBTkNFTExFRBAF');
+
+@$core.Deprecated('Use cancelInvocationResponseDescriptor instead')
+const CancelInvocationResponse$json = {
+  '1': 'CancelInvocationResponse',
+  '2': [
+    {'1': 'cancelled', '3': 1, '4': 1, '5': 8, '10': 'cancelled'},
+  ],
+};
+
+/// Descriptor for `CancelInvocationResponse`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List cancelInvocationResponseDescriptor =
+    $convert.base64Decode(
+        'ChhDYW5jZWxJbnZvY2F0aW9uUmVzcG9uc2USHAoJY2FuY2VsbGVkGAEgASgIUgljYW5jZWxsZW'
+        'Q=');
+
 @$core.Deprecated('Use moduleListDescriptor instead')
 const ModuleList$json = {
   '1': 'ModuleList',
@@ -1077,6 +1261,7 @@ const StoreEntry$json = {
     {'1': 'kind', '3': 19, '4': 1, '5': 9, '10': 'kind'},
     {'1': 'provider', '3': 20, '4': 1, '5': 9, '10': 'provider'},
     {'1': 'source_kind', '3': 21, '4': 1, '5': 9, '10': 'sourceKind'},
+    {'1': 'source', '3': 22, '4': 1, '5': 9, '10': 'source'},
   ],
 };
 
@@ -1094,7 +1279,7 @@ final $typed_data.Uint8List storeEntryDescriptor = $convert.base64Decode(
     '9uX3VybBgQIAEoCVIHaWNvblVybBInCg9zY3JlZW5zaG90X3VybHMYESADKAlSDnNjcmVlbnNo'
     'b3RVcmxzEhkKCGRvY3NfdXJsGBIgASgJUgdkb2NzVXJsEhIKBGtpbmQYEyABKAlSBGtpbmQSGg'
     'oIcHJvdmlkZXIYFCABKAlSCHByb3ZpZGVyEh8KC3NvdXJjZV9raW5kGBUgASgJUgpzb3VyY2VL'
-    'aW5k');
+    'aW5kEhYKBnNvdXJjZRgWIAEoCVIGc291cmNl');
 
 @$core.Deprecated('Use channelStatusResponseDescriptor instead')
 const ChannelStatusResponse$json = {

lib/src/hub_client.dart

@@ -86,6 +86,11 @@ typedef StoreSearchResponse = pb.StoreSearchResponse;
 typedef InstallModuleResponse = pb.InstallModuleResponse;
 typedef Payload = pb_common.Payload;
 typedef SubmitResponse = pb.SubmitResponse;
+// Live-stream (T2) + detached-invocation (T3) wire types, re-exported
+// so consumers of [HubClient.submitStreaming] don't import the
+// generated package directly.
+typedef SubmitStreamEvent = pb.SubmitStreamEvent;
+typedef InvocationStatus = pb.InvocationStatus;
 
 /// Typed client for the F∆I Hub gRPC surface. Construct once,
 /// reuse for the process lifetime, call [close] on shutdown.
@@ -779,8 +784,80 @@ class HubClient {
     Map<String, Uint8List> fileInputs = const {},
     Map<String, Object?> jsonInputs = const {},
     Map<String, String> fileMimeTypes = const {},
+    bool detach = false,
   }) async {
-    final req = pb.SubmitRequest()..flowYaml = utf8.encode(flowYaml);
+    return _hub.submit(_buildSubmitRequest(
+      flowYaml: flowYaml,
+      textInputs: textInputs,
+      fileInputs: fileInputs,
+      jsonInputs: jsonInputs,
+      fileMimeTypes: fileMimeTypes,
+      detach: detach,
+    ));
+  }
+
+  /// Submit a flow and follow its execution live (server streaming).
+  ///
+  /// Yields [pb.SubmitStreamEvent]s in order: `stepStarted` /
+  /// `stepFinished` markers, `moduleEvent`s (a module's ephemeral
+  /// `host.emit-event`s), and finally either `finalResult` (== the
+  /// unary [submit] response) or `error`. Works over native gRPC and,
+  /// on web targets, gRPC-Web. Same inputs as [submit].
+  ///
+  /// ```dart
+  /// await for (final ev in hub.submitStreaming(flowYaml: yaml)) {
+  ///   if (ev.hasModuleEvent()) print('${ev.moduleEvent.name}');
+  ///   if (ev.hasFinalResult()) print(ev.finalResult.outputs);
+  /// }
+  /// ```
+  Stream<SubmitStreamEvent> submitStreaming({
+    required String flowYaml,
+    Map<String, String> textInputs = const {},
+    Map<String, Uint8List> fileInputs = const {},
+    Map<String, Object?> jsonInputs = const {},
+    Map<String, String> fileMimeTypes = const {},
+  }) {
+    return _hub.submitStream(_buildSubmitRequest(
+      flowYaml: flowYaml,
+      textInputs: textInputs,
+      fileInputs: fileInputs,
+      jsonInputs: jsonInputs,
+      fileMimeTypes: fileMimeTypes,
+    ));
+  }
+
+  /// Status of a detached invocation (T3). Throws a [GrpcError] with
+  /// code `notFound` for an unknown id.
+  Future<InvocationStatus> getInvocationStatus(String invocationId) {
+    return _hub.getInvocationStatus(pb_common.InvocationId()..value = invocationId);
+  }
+
+  /// Retained result of a succeeded detached invocation (T3). Throws
+  /// `failedPrecondition` if it is still running / failed, `notFound`
+  /// if unknown or already evicted.
+  Future<SubmitResponse> getInvocationResult(String invocationId) {
+    return _hub.getInvocationResult(pb_common.InvocationId()..value = invocationId);
+  }
+
+  /// Cancel a running detached invocation (T3). Returns true if it was
+  /// running and got signalled, false if already finished or unknown.
+  Future<bool> cancelInvocation(String invocationId) async {
+    final r =
+        await _hub.cancelInvocation(pb_common.InvocationId()..value = invocationId);
+    return r.cancelled;
+  }
+
+  pb.SubmitRequest _buildSubmitRequest({
+    required String flowYaml,
+    required Map<String, String> textInputs,
+    required Map<String, Uint8List> fileInputs,
+    required Map<String, Object?> jsonInputs,
+    required Map<String, String> fileMimeTypes,
+    bool detach = false,
+  }) {
+    final req = pb.SubmitRequest()
+      ..flowYaml = utf8.encode(flowYaml)
+      ..detach = detach;
     for (final entry in textInputs.entries) {
       req.inputs[entry.key] = pb_common.Payload()..text = entry.value;
     }
@@ -801,7 +878,7 @@ class HubClient {
       }
       req.inputs[entry.key] = pb_common.Payload()..json = _structFromMap(value);
     }
-    return _hub.submit(req);
+    return req;
   }
 
   /// Closes the gRPC channel. Idempotent.