feat(worker): remove a queued interactive message

StreamingClaudeSession.RemoveQueuedAsync drops the first occurrence of a queued
message from _pending and re-broadcasts the updated queue. Wired through
InteractiveSessionService + WorkerHub.RemoveQueuedInteractiveMessage +
IWorkerClient.RemoveQueuedInteractiveMessageAsync. Removal by text (first match)
is robust to a turn flushing mid-click. Fakes + ILiveSession impls updated.

tests/ClaudeDo.Worker.Tests/Runner/StreamingClaudeSessionTests.cs

@@ -403,4 +403,67 @@ public sealed class StreamingClaudeSessionTests
 
         await session.DisposeAsync();
     }
+
+    // ──────────────────────────────────────────────────────────────────────────
+    // RemoveQueuedAsync tests
+    // ──────────────────────────────────────────────────────────────────────────
+
+    [Fact]
+    public async Task RemoveQueued_RemovesFirstOccurrence_SnapshotContainsOnlySecond_AndSecondDeliveredOnResult()
+    {
+        var transport = new FakeClaudeStreamTransport();
+        var queueChanges = new List<IReadOnlyList<string>>();
+        var sent = new List<string>();
+        var session = BuildWithCallbacks(transport, queueChanges, sent);
+
+        await session.StartAsync([], "/tmp", "first", CancellationToken.None);
+        sent.Clear();
+
+        // Enqueue two messages while turn is in flight.
+        await session.SendUserMessageAsync("alpha", CancellationToken.None);
+        await session.SendUserMessageAsync("beta", CancellationToken.None);
+        queueChanges.Clear();
+
+        // Remove "alpha" from the queue.
+        await session.RemoveQueuedAsync("alpha", CancellationToken.None);
+
+        // Snapshot emitted and contains only "beta".
+        Assert.Single(queueChanges);
+        Assert.Equal(new[] { "beta" }, queueChanges[0]);
+
+        // Push result → only "beta" is flushed, not "alpha".
+        sent.Clear();
+        queueChanges.Clear();
+        await transport.PushLineAsync(ResultLine());
+
+        Assert.Single(sent);
+        Assert.Equal("beta", sent[0]);
+
+        // Queue now empty; next result leaves us idle.
+        await transport.PushLineAsync(ResultLine());
+        Assert.False(session.IsTurnInFlight);
+
+        await session.DisposeAsync();
+    }
+
+    [Fact]
+    public async Task RemoveQueued_NotFound_NoQueueChangedCallback()
+    {
+        var transport = new FakeClaudeStreamTransport();
+        var queueChanges = new List<IReadOnlyList<string>>();
+        var sent = new List<string>();
+        var session = BuildWithCallbacks(transport, queueChanges, sent);
+
+        await session.StartAsync([], "/tmp", "first", CancellationToken.None);
+        await session.SendUserMessageAsync("alpha", CancellationToken.None);
+        queueChanges.Clear();
+
+        // Try to remove a message that is not in the queue.
+        await session.RemoveQueuedAsync("nope", CancellationToken.None);
+
+        // No new snapshot emitted.
+        Assert.Empty(queueChanges);
+
+        await session.DisposeAsync();
+    }
 }