fix(wpf): restore verified unavailable artifacts

CHANGELOG.md

@@ -21,8 +21,8 @@ version numbers, because that is what those releases were called.
 
 ### Fixed: restore and snapshot integrity
 
-- Verified successful manifest rows against their physical artifacts and kept unavailable modules out
-  of restore sets, preventing stale metadata from authorizing an unsafe restore.
+- Verified successful manifest rows against their physical artifacts and admitted only rows with a
+  usable artifact, including modules whose live drift cannot be compared safely.
 - Read the selected app export directly from its prepared payload and exposed friendly source names in
   the reinstall picker.
 - Created a fresh, second-precision folder for every user backup and reserved collision suffixes

src/WinRestoreKit.Application/Comparison/ModuleComparison.cs

@@ -21,7 +21,6 @@ internal ModuleComparison(BackupBase module, ComparisonState state,
         public bool HasUsableArtifact { get; }
 
         public bool CanRestore => HasUsableArtifact
-            && State != ComparisonState.Unavailable
             && State != ComparisonState.NotCaptured;
 
         public string ArtifactSummary { get; }

src/WinRestoreKit.Tests/RestoreSetViewModelTests.cs

@@ -7,7 +7,7 @@ namespace WinRestoreKit.Tests
     public sealed class RestoreSetViewModelTests
     {
         [Fact]
-        public void RestoreSet_AcceptsOnlyComparableRowsWithUsableArtifacts()
+        public void RestoreSet_AcceptsEveryUsableArtifactEvenWhenDriftIsUnavailable()
         {
             WpfTestHost.Run(() =>
             {
@@ -26,9 +26,10 @@ public void RestoreSet_AcceptsOnlyComparableRowsWithUsableArtifacts()
                 restoreSet.Add(changed);
                 restoreSet.Add(absent);
 
-                Assert.Single(restoreSet.Modules);
-                Assert.Same(usableModule, restoreSet.Modules[0]);
-                Assert.False(restoreSet.Contains(unavailableModule));
+                Assert.Collection(restoreSet.Modules,
+                    module => Assert.Same(unavailableModule, module),
+                    module => Assert.Same(usableModule, module));
+                Assert.True(restoreSet.Contains(unavailableModule));
                 Assert.False(restoreSet.Contains(absentModule));
             });
         }

src/WinRestoreKit.Tests/SnapshotComparisonServiceTests.cs

@@ -144,7 +144,7 @@ public async Task CompareAsync_ArtifactProbeException_IsUnavailableWithoutDriftP
         }
 
         [Fact]
-        public async Task CompareAsync_IndeterminateDrift_StaysUnavailableWithUsableArtifact()
+        public async Task CompareAsync_IndeterminateDrift_RemainsRestorableWithUsableArtifact()
         {
             using (TestDirectory backup = TestDirectory.Create())
             {
@@ -155,7 +155,7 @@ public async Task CompareAsync_IndeterminateDrift_StaysUnavailableWithUsableArti
 
                 Assert.Equal(ComparisonState.Unavailable, row.State);
                 Assert.True(row.HasUsableArtifact);
-                Assert.False(row.CanRestore);
+                Assert.True(row.CanRestore);
             }
         }