test: classify prerequisite lanes and own Avalonia sessions

tests/AcDream.Core.Tests/Physics/CellTransitFindTransitCellsBoxTests.cs

@@ -263,6 +263,7 @@ public sealed class CellTransitFindTransitCellsBoxTests
     /// for the exact counts from this run.
     /// </summary>
     [Fact]
+    [Trait("Lane", "InstalledDat")]
     public void InstalledDat_RandomizedPartSweepNearRealPortals_PostFixMembershipIsSubsetOfPreFix()
     {
         string? datDirectory = ConformanceDats.ResolveDatDir();