fix(mobile): recover rejected and lost agent registrations anywhere

An HTTP rejection of register-agent is as definite as a rejected status,
so it clears the registering mark and the setup can be discarded. A
registration whose response was lost can be replayed from any
community to learn its identity; finishing still needs the original
community. Publishing or removing a registration now refreshes remote
availability even when the registry's ACTIVE set is unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tom Brow <tomb@block.xyz>

mobile/lib/shared/agents/remote_agents.dart

@@ -50,8 +50,12 @@ final availableRemoteAgentsProvider = FutureProvider<Set<String>>((ref) async {
   ref.watch(relaySessionProvider.select((session) => session.status));
   final controller = ref.watch(remoteAgentControllerProvider);
   final active = controller.activeAgents;
+  final revision = controller.registrationRevision;
   void changed() {
-    if (!setEquals(controller.activeAgents, active)) ref.invalidateSelf();
+    if (!setEquals(controller.activeAgents, active) ||
+        controller.registrationRevision != revision) {
+      ref.invalidateSelf();
+    }
   }
 
   controller.addListener(changed);
@@ -217,6 +221,15 @@ class RemoteAgentController extends ChangeNotifier {
     if (!_disposed) notifyListeners();
   }
 
+  /// Bumped when this device publishes or removes a kind 30177 registration,
+  /// which changes availability even when the registry's ACTIVE set does not.
+  int registrationRevision = 0;
+
+  void _registrationsChanged() {
+    registrationRevision++;
+    _notify();
+  }
+
   Future<void> refresh() async {
     final session = account.account ?? await account.restore();
     if (session == null) {
@@ -353,7 +366,13 @@ class RemoteAgentController extends ChangeNotifier {
       });
     }
     var setup = Map<String, dynamic>.from(pending!);
-    if (setup['owner'] != owner || setup['community'] != community.relayUrl) {
+    // A registration whose response was lost may be replayed from any
+    // community, so the account learns its identity even if the original
+    // community is unavailable. Everything after it needs that community.
+    final elsewhere = setup['community'] != community.relayUrl;
+    final unknownIdentity =
+        setup['pubkey'] == null && setup['registering'] == true;
+    if (setup['owner'] != owner || (elsewhere && !unknownIdentity)) {
       throw StateError('Finish the pending setup in its original community.');
     }
     if (setup['instructionsMissing'] == true) {
@@ -371,16 +390,26 @@ class RemoteAgentController extends ChangeNotifier {
       // lost. Only Resume, with the same idempotency key, can recover it.
       setup = {...setup, 'registering': true};
       await _savePending(setup);
-      final result = await account.post('/v3/beekeeper/register-agent', {
-        'agent_name': setup['name'],
-        'idempotency_key': setup['request'],
-      });
+      // An explicit rejection allocated nothing, so it can be discarded.
+      Future<void> refused() async {
+        setup = {...setup}..remove('registering');
+        await _savePending(setup);
+      }
+
+      final Map<String, dynamic> result;
+      try {
+        result = await account.post('/v3/beekeeper/register-agent', {
+          'agent_name': setup['name'],
+          'idempotency_key': setup['request'],
+        });
+      } on AccountFailure catch (failure) {
+        if (failure == AccountFailure.rejected) await refused();
+        rethrow;
+      }
       if (!hasStatus(result, 'UNATTESTED', 1) &&
           result['status'] != null &&
           result['agent_pubkey'] == null) {
-        // An explicit rejection allocated nothing, so it can be discarded.
-        setup = {...setup}..remove('registering');
-        await _savePending(setup);
+        await refused();
       }
       requireStatus(result, 'UNATTESTED', 1);
       final pubkey = result['agent_pubkey'];
@@ -392,6 +421,11 @@ class RemoteAgentController extends ChangeNotifier {
       setup = {...setup, 'pubkey': pubkey, 'id': result['agent_id']};
       await _savePending(setup);
     }
+    if (elsewhere) {
+      throw StateError(
+        'Agent identity recovered. Finish the setup in its original community.',
+      );
+    }
     final pubkey = setup['pubkey'] as String;
     status = 'Authorizing and activating agent…';
     _notify();
@@ -412,6 +446,7 @@ class RemoteAgentController extends ChangeNotifier {
     }
     await subscribe(setup['id'] as String, community.relayUrl);
     await publishPolicy(community.relayUrl, setup);
+    _registrationsChanged();
     // Retain the completed registration if the listing refresh fails, so Retry
     // resumes the same identity instead of creating another agent.
     await refresh();
@@ -577,6 +612,7 @@ class RemoteAgentController extends ChangeNotifier {
     }
     check();
     await removePolicy(community.relayUrl, pubkey);
+    _registrationsChanged();
     check();
     final remaining = await fetch(
       NostrFilter(

mobile/test/helpers/remote_agents_fixture.dart

@@ -42,6 +42,7 @@ class FakeRegistry extends BuilderlabAccountClient {
   bool failInstructions = false;
   bool rejectRegistration = false;
   bool loseRegistration = false;
+  bool refuseRegistration = false;
   Object deleteStatus = 1;
   final calls = <String>[];
   final bodies = <String, Map<String, dynamic>>{};
@@ -68,6 +69,7 @@ class FakeRegistry extends BuilderlabAccountClient {
       case '/v3/beekeeper/list-agents':
         return {'status': 1, 'agents': listed};
       case '/v3/beekeeper/register-agent':
+        if (refuseRegistration) throw AccountFailure.rejected;
         if (rejectRegistration) {
           return {'status': 'REGISTER_AGENT_STATUS_NAME_TAKEN'};
         }

mobile/test/shared/agents/remote_agents_test.dart

@@ -338,6 +338,13 @@ void main() {
     );
     expect(controller.status, contains('NAME_TAKEN'));
     expect(controller.canDiscardPending, isTrue);
+    // An HTTP rejection is just as definite.
+    registry
+      ..rejectRegistration = false
+      ..refuseRegistration = true;
+    expect(await controller.create(community, 'Scout'), isFalse);
+    expect(controller.status, contains('rejected'));
+    expect(controller.canDiscardPending, isTrue);
     final request = controller.pending!['request'];
     expect(prefs.getString('$_scope:pending'), isNotNull);
 
@@ -351,7 +358,7 @@ void main() {
 
     // A lost response may hide a committed identity, so it can only resume.
     registry
-      ..rejectRegistration = false
+      ..refuseRegistration = false
       ..loseRegistration = true;
     expect(
       await controller.create(community, 'Scout', instructions: 'Private.'),
@@ -385,16 +392,21 @@ void main() {
     expect(await remove(other), isFalse);
     expect(controller.status, contains('Resume the unfinished setup'));
 
-    // Resume reuses the idempotency key and recovers the same identity.
+    // Resume from another community reuses the idempotency key and recovers
+    // the same identity; finishing it still needs the original community.
     registry
       ..loseRegistration = false
-      ..failInstructions = true
       ..bodies.clear();
-    expect(await controller.create(community, 'Scout'), isFalse);
+    expect(await controller.create(elsewhere, 'Scout'), isFalse);
+    expect(controller.status, contains('Agent identity recovered'));
     expect(
       registry.bodies['/v3/beekeeper/register-agent']?['idempotency_key'],
       lost,
     );
+    registry.bodies.clear();
+    expect(await controller.create(elsewhere, 'Scout'), isFalse);
+    expect(controller.status, contains('original community'));
+    expect(registry.bodies, isEmpty);
     expect(controller.pending?['pubkey'], fakeAgent);
     expect(await controller.discardPending(), isFalse);
     expect(controller.pending?['pubkey'], fakeAgent);
@@ -519,6 +531,31 @@ void main() {
       fakeAgent,
     });
     expect(container.read(presentedPresenceProvider)[fakeAgent], 'online');
+
+    // Removing the registration hides it even when the runtime stays ACTIVE.
+    registry.deleteStatus = 2;
+    relay.live = false;
+    expect(
+      await controller.deleteAgent(
+        pubkey: fakeAgent,
+        community: _community(),
+        isCurrent: () => true,
+        fetch: (_) async => [],
+      ),
+      isFalse,
+    );
+    expect(controller.activeAgents, {fakeAgent});
+    expect(await container.read(availableRemoteAgentsProvider.future), isEmpty);
+    expect(container.read(presentedPresenceProvider)[fakeAgent], 'offline');
+
+    // Publishing a registration for the still-ACTIVE agent shows it again.
+    relay.live = true;
+    expect(await controller.create(_community(), 'Scout'), isTrue);
+    expect(controller.activeAgents, {fakeAgent});
+    expect(await container.read(availableRemoteAgentsProvider.future), {
+      fakeAgent,
+    });
+    expect(container.read(presentedPresenceProvider)[fakeAgent], 'online');
   }, skip: !HostedEnvironment.enabled);
 
   test('owner proof verifies for only the provisioned agent key', () {