Fix test count for parameterized tests

Update total dynamically as TestStarted events arrive, since NUnit
expands parameterized tests (e.g., strict/non-strict mode) which
results in more actual tests than our discovery finds.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: rogeralsing

src/Asynkron.TestRunner/LiveDisplay.cs

@@ -21,6 +21,7 @@ public class LiveDisplay
     private int _skipped;
     private int _hanging;
     private int _crashed;
+    private int _seen; // Actual unique tests seen (handles parameterized expansion)
     private readonly HashSet<string> _running = new();
     private string? _lastCompleted;
     private string? _lastStatus;
@@ -32,7 +33,14 @@ public void SetTotal(int total)
 
     public void TestStarted(string displayName)
     {
-        lock (_lock) _running.Add(Truncate(displayName, ContentWidth));
+        lock (_lock)
+        {
+            _running.Add(Truncate(displayName, ContentWidth));
+            _seen++;
+            // Update total if we're seeing more tests than discovered (parameterized expansion)
+            if (_seen > _total)
+                _total = _seen;
+        }
     }
 
     public void TestPassed(string displayName)