test(telegram): relogin test deactivates host tools such as set_timezone

The fake claude never starts the proposal bridge, so the test needs a
session with no active tools. Since the scheduler spec every chat
registers set_timezone, which made the provider wait for the bridge and
fail with mcp_startup on Linux (the test returns early on Windows).

tests/Volcanic.AgenticCore.Telegram.Tests/ClaudeCodeReloginTests.cs

@@ -1,5 +1,7 @@
 using Microsoft.Extensions.DependencyInjection;
 using Telegram.Bot.Types.ReplyMarkups;
+using Volcanic.AgenticCore.Abstractions.Extensions;
+using Volcanic.AgenticCore.Abstractions.Extensions.Events;
 using Volcanic.AgenticCore.Extensions.ClaudeCode;
 using Volcanic.AgenticCore.Telegram.Chats;
 using Volcanic.AgenticCore.Telegram.Tests.Support;
@@ -87,7 +89,10 @@ public sealed class ClaudeCodeReloginTests : IDisposable
             }),
             core =>
             {
-                core.IncludeBuiltInTools = false; // no tools: the fake needs no proposal bridge
+                // No tools: the fake needs no proposal bridge. Host extensions still register tools (set_timezone in
+                // every chat), so NoTools deactivates them once the session has started.
+                core.IncludeBuiltInTools = false;
+                core.AddExtension(new NoTools());
                 core.AddExtension<ClaudeCodeProviderExtension>();
             });
         host.Options.Model = "claude-code/sonnet";
@@ -97,7 +102,13 @@ public sealed class ClaudeCodeReloginTests : IDisposable
 
         // The link and the code question reach the owner (the first allowed user), not the requester.
         var owner = await host.ChatAsync(Updates.AllowedUser);
-        await Wait.UntilAsync(() => owner.Ui.IsWaitingForInput, "the login code question in the owner chat", 15000);
+        try { await Wait.UntilAsync(() => owner.Ui.IsWaitingForInput, "the login code question in the owner chat", 5000); }
+        catch (TimeoutException)
+        {
+            foreach (var s in host.Bot.Sent) Console.Error.WriteLine($"SENT {s.ChatId.Identifier}: {s.Text}");
+            Console.Error.WriteLine("RUNS: " + (File.Exists(Path.Combine(_root, "state", "runs")) ? File.ReadAllText(Path.Combine(_root, "state", "runs")) : "none"));
+            throw;
+        }
         var prompt = Assert.Single(host.Bot.Sent, s => s.Text.Contains("oauth/authorize?state=owner", StringComparison.Ordinal));
         Assert.Equal(Updates.AllowedUser, prompt.ChatId.Identifier);
         Assert.IsType<ForceReplyMarkup>(prompt.ReplyMarkup);
@@ -115,6 +126,22 @@ public sealed class ClaudeCodeReloginTests : IDisposable
         Assert.Equal(2, File.ReadAllLines(Path.Combine(_root, "state", "runs")).Length);
         Assert.Empty(host.Faux.Requests);
     }
+
+    /// <summary>Deactivates every tool at session start, including those host extensions registered.</summary>
+    private sealed class NoTools : IExtension
+    {
+        public string Name => "no-tools";
+
+        public ValueTask ActivateAsync(IExtensionApi api, CancellationToken cancellationToken)
+        {
+            api.On<SessionStartEvent>((_, _, _) =>
+            {
+                api.SetActiveTools([]);
+                return ValueTask.CompletedTask;
+            });
+            return ValueTask.CompletedTask;
+        }
+    }
 }
 
 /// <summary>