Bound discovery without an unsupported owner filter

Signed-off-by: kenny lopez <klopez4212@gmail.com>

mobile/lib/shared/me/me_assistants.dart

@@ -43,6 +43,9 @@ Future<List<AgentDirectoryEntry>> _loadAssistants(
   final profiles = <String, NostrEvent>{};
   final seen = <String>{};
   const pageSize = 100;
+  // The current relay only indexes single-letter NIP-01 tag filters. It
+  // silently drops #auth, so owner-scoped discovery needs relay support.
+  // Until then fail visibly at this bound rather than drain the directory.
   const maxPages = 10;
   for (var page = 1; page <= maxPages; page++) {
     sync.check();
@@ -50,11 +53,6 @@ Future<List<AgentDirectoryEntry>> _loadAssistants(
       NostrFilter(
         kinds: const [0],
         authors: pubkey == null ? null : [pubkey],
-        tags: pubkey == null
-            ? {
-                '#auth': [sync.pubkey],
-              }
-            : const {},
         limit: pageSize,
         extensions: {'page': page},
       ),

mobile/test/shared/me/me_assistants_test.dart

@@ -125,7 +125,7 @@ void main() {
     expect(relay.requestedPages, [1, 2]);
   });
   test(
-    'owner discovery is scoped and bounded even when the relay keeps paging',
+    'directory discovery is bounded even when the relay keeps paging',
     () async {
       final repeated = [
         for (var i = 0; i < 99; i++) profile(agent, ownedBy: owner, time: i),
@@ -140,7 +140,7 @@ void main() {
       );
       expect(relay.requestedPages.length, 10);
       for (final filter in relay.requestedTags) {
-        expect(filter['#auth'], [owner.public]);
+        expect(filter.containsKey('#auth'), isFalse);
         expect(filter['limit'], 100);
       }
     },