Fix timed-out tests not being removed from running display

- Added FQN to DisplayName mapping so we can find the right entry
- TestHanging now uses DisplayName to remove from display
- Added TestRemoved for suspicious tests moved to isolated retry
- Tests no longer linger in the running list after timeout

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: rogeralsing

src/Asynkron.TestRunner/LiveDisplay.cs

@@ -158,6 +158,15 @@ public void TestStarted(string displayName)
         lock (_lock) _running[Truncate(displayName, ContentWidth)] = DateTime.UtcNow;
     }
 
+    /// <summary>
+    /// Removes a test from the running list without marking any status.
+    /// Used when moving tests to isolated retry.
+    /// </summary>
+    public void TestRemoved(string displayName)
+    {
+        lock (_lock) _running.Remove(Truncate(displayName, ContentWidth));
+    }
+
     public void TestPassed(string displayName)
     {
         lock (_lock)

src/Asynkron.TestRunner/TestRunner.cs

@@ -256,6 +256,7 @@ private async Task RunWorkerBatchAsync(
         var suspectedCrashTests = new HashSet<string>(); // Tests that need isolated retry
         var testOutput = new Dictionary<string, StringBuilder>(); // Capture output per test
         var testStartTimes = new Dictionary<string, DateTime>();
+        var fqnToDisplayName = new Dictionary<string, string>(); // Map FQN to DisplayName for proper removal
 
         Log(workerIndex, $"Starting batch: {batch.Count} tests");
 
@@ -321,7 +322,8 @@ private async Task RunWorkerBatchAsync(
                             running.Remove(fqn);
                             pending.Remove(fqn);
                             lock (results) results.Hanging.Add(fqn);
-                            display.TestHanging(fqn);
+                            var displayName = fqnToDisplayName.GetValueOrDefault(fqn, fqn);
+                            display.TestHanging(displayName);
                             display.WorkerTestHanging(workerIndex);
                             ReportCrashedOrHanging(fqn, "hanging", testOutput, $"Test exceeded per-test timeout of {_testTimeoutSeconds * 2}s");
                         }
@@ -333,6 +335,8 @@ private async Task RunWorkerBatchAsync(
                             running.Remove(fqn);
                             pending.Remove(fqn);
                             suspectedCrashTests.Add(fqn);
+                            var displayName = fqnToDisplayName.GetValueOrDefault(fqn, fqn);
+                            display.TestRemoved(displayName);
                         }
 
                         // Kill worker and restart with remaining tests
@@ -346,6 +350,7 @@ private async Task RunWorkerBatchAsync(
                         case TestStartedEvent started:
                             running.Add(started.FullyQualifiedName);
                             testStartTimes[started.FullyQualifiedName] = DateTime.UtcNow;
+                            fqnToDisplayName[started.FullyQualifiedName] = started.DisplayName;
                             display.TestStarted(started.DisplayName);
                             break;