fix: always resolve video paths via GetFullPath before Uri conversion (rooted Windows paths are not absolute URIs); deadline-based CD rip/burn test polling

src/NotZune.Infrastructure.Video/VideoPlaybackEngine.cs

@@ -78,10 +78,10 @@ public sealed class VideoPlaybackEngine : IVideoPlaybackEngine
 
         lock (_gate)
         {
-            // Windows paths and CI-relative paths are not valid absolute URIs;
-            // resolve to a full path first (nonexistent files still play-fail gracefully).
-            var mediaPath = Path.IsPathRooted(filePath) ? filePath : Path.GetFullPath(filePath);
-            using var media = new Media(_libVlc, new Uri(mediaPath));
+            // Windows paths (including rooted-but-not-drive-qualified ones like /x/y.mp4)
+            // are not valid absolute URIs; resolve to a full path first (nonexistent
+            // files still play-fail gracefully inside libVLC).
+            using var media = new Media(_libVlc, new Uri(Path.GetFullPath(filePath)));
             _mediaPlayer.Play(media);
         }
     }

tests/NotZune.Tests.Application/ZunePhase3FidelityTests.cs

@@ -224,7 +224,7 @@ public class ZunePhase3FidelityTests
 
         // Execute Rip
         vm.RipCdCommand.Execute(null);
-        await Task.Delay(3500); // Allow async rip simulation
+        await WaitForCompletionAsync(() => vm.RipProgress);
 
         Assert.Equal(1.0, vm.RipProgress);
         Assert.Equal(1, sound.RipCount);
@@ -235,12 +235,25 @@ public class ZunePhase3FidelityTests
 
         // Execute Burn
         vm.BurnCdCommand.Execute(null);
-        await Task.Delay(3500); // Allow async burn simulation
+        await WaitForCompletionAsync(() => vm.BurnProgress);
 
         Assert.Equal(1.0, vm.BurnProgress);
         Assert.Equal(1, sound.BurnCount);
     }
 
+    /// <summary>
+    /// Polls until the simulated rip/burn progress completes (or fails the deadline).
+    /// A fixed Task.Delay is flaky on loaded CI runners where scheduler jitter stacks up.
+    /// </summary>
+    private static async Task WaitForCompletionAsync(Func<double> progress)
+    {
+        var deadline = DateTime.UtcNow.AddSeconds(60);
+        while (progress() < 1.0 && DateTime.UtcNow < deadline)
+        {
+            await Task.Delay(100);
+        }
+    }
+
     [Fact]
     public void NowPlayingViewModel_KenBurnsAndMixviewAction_FunctionCorrectly()
     {