test: separate diagnostic apparatus from release gates

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

@@ -129,6 +129,7 @@ public class CameraCornerSealReplayTests
     /// shadow-query path is the half that failed).
     /// </summary>
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void Diagnostic_DispatchTrace_LeakPath_vs_Controls()
     {
         var datDir = ConformanceDats.ResolveDatDir();

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

@@ -237,6 +237,7 @@ public class DoorSetupGfxObjInspectionTests
     //       computes a different outdoor cell than 0xA9B40029
     // Findings drive the fix direction.
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void HoltburgCottage_CellPortals_DatInspection()
     {
         var datDir = Env.GetEnvironmentVariable("ACDREAM_DAT_DIR")
@@ -271,6 +272,7 @@ public class DoorSetupGfxObjInspectionTests
     /// building wall sub-piece) lives at that XY.
     /// </summary>
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void HoltburgLandblockStatics_DatInspection()
     {
         var datDir = Env.GetEnvironmentVariable("ACDREAM_DAT_DIR")

tests/AcDream.Core.Tests/Physics/Issue137CorridorSeamInspectionTests.cs

@@ -280,6 +280,7 @@ public class Issue137CorridorSeamInspectionTests
     /// hit point + normal.
     /// </summary>
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void CorridorSeam_FindPolygonMatchingLiveHit()
     {
         var datDir = Env.GetEnvironmentVariable("ACDREAM_DAT_DIR")

tests/AcDream.Core.Tests/Physics/Issue186ConnectorCellGeometryInspectionTests.cs

@@ -33,6 +33,7 @@ public class Issue186ConnectorCellGeometryInspectionTests
     }
 
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void Dump_ConnectorCells_ShellAndCollision()
     {
         var datDir = DatDir();

tests/AcDream.Core.Tests/Physics/Issue188FadingDoorMotionTableInspectionTests.cs

@@ -25,6 +25,7 @@ namespace AcDream.Core.Tests.Physics;
 /// wired). Kept as a reusable decoder for any future "why doesn't this
 /// animate" question — swap the MotionTableId.
 /// </summary>
+[Trait("Purpose", "Diagnostic")]
 public class Issue188FadingDoorMotionTableInspectionTests
 {
     private readonly ITestOutputHelper _out;