test: separate diagnostic apparatus from release gates

tests/AcDream.Core.Tests/Conformance/CottageDoorwayCharacterizationTests.cs

@@ -21,6 +21,7 @@ public class CottageDoorwayCharacterizationTests
     public CottageDoorwayCharacterizationTests(ITestOutputHelper output) => _out = output;
 
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void Characterize_CottageNeighborhood_PrintStructure()
     {
         var datDir = ConformanceDats.ResolveDatDir();
@@ -65,6 +66,7 @@ public class CottageDoorwayCharacterizationTests
     public const uint OutdoorLandcell0031 = 0xA9B40031u;
 
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void Characterize_Doorway_FindInteriorPoints()
     {
         var datDir = ConformanceDats.ResolveDatDir();

tests/AcDream.Core.Tests/Conformance/DungeonLandblockDatProbeTests.cs

@@ -16,6 +16,7 @@ namespace AcDream.Core.Tests.Conformance;
 /// landblock have a LandBlock (0xXXYYFFFF) terrain record at all, or only
 /// LandBlockInfo + EnvCells? Output-only — no assertions.
 /// </summary>
+[Trait("Purpose", "Diagnostic")]
 public sealed class DungeonLandblockDatProbeTests
 {
     private readonly ITestOutputHelper _out;

tests/AcDream.Core.Tests/Conformance/HoltburgTorchFalloffProbeTests.cs

@@ -20,6 +20,7 @@ namespace AcDream.Core.Tests.Conformance;
 /// these falloffs ARE what retail reads (modulo any load-time transform, settled
 /// separately in the decomp). Output-only — no assertions; read the log.
 /// </summary>
+[Trait("Purpose", "Diagnostic")]
 public sealed class HoltburgTorchFalloffProbeTests
 {
     private readonly ITestOutputHelper _out;

tests/AcDream.Core.Tests/Conformance/Issue113DoorVanishDiagnosticTests.cs

@@ -70,6 +70,7 @@ public sealed class Issue113DoorVanishDiagnosticTests
     /// vertical door-sized quads.
     /// </summary>
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void DumpHoltburgBuildings_OrphanGeometry()
     {
         var datDir = ConformanceDats.ResolveDatDir();
@@ -191,7 +192,8 @@ public sealed class Issue113DoorVanishDiagnosticTests
     /// must move.
     /// </summary>
     [Fact]
-    public void ReplicateProductionEmission_OnPortalFills()
+    [Trait("Purpose", "Diagnostic")]
+    public void Diagnostic_ReplicateProductionEmission_OnPortalFills()
     {
         var datDir = ConformanceDats.ResolveDatDir();
         if (datDir is null) { _out.WriteLine("dats unavailable — skipped"); return; }
@@ -237,6 +239,7 @@ public sealed class Issue113DoorVanishDiagnosticTests
     /// which is exactly why retail shows doors but not the ramp.
     /// </summary>
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void DumpPortalFillSurfaceTypes()
     {
         var datDir = ConformanceDats.ResolveDatDir();
@@ -282,6 +285,7 @@ public sealed class Issue113DoorVanishDiagnosticTests
     /// the phantom geometry, for type-model comparison against the door.
     /// </summary>
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void DumpControls_HallAndCottage()
     {
         var datDir = ConformanceDats.ResolveDatDir();

tests/AcDream.Core.Tests/Conformance/Issue113PhantomStairsDumpTests.cs

@@ -287,6 +287,7 @@ public sealed class Issue113PhantomStairsDumpTests
     /// sphere STRADDLES this plane (|dist| < radius + 0.0002, pc:310090-310120).
     /// </summary>
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void Dump_Cell104_ExteriorPortalPlane_Vs_GapPoint()
     {
         var datDir = ConformanceDats.ResolveDatDir();
@@ -559,6 +560,7 @@ public sealed class Issue113PhantomStairsDumpTests
     /// printed top→bottom DESCENDING (north up).
     /// </summary>
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void DumpAAB3_Watchtower_TopDownMap()
     {
         var datDir = ConformanceDats.ResolveDatDir();
@@ -679,6 +681,7 @@ public sealed class Issue113PhantomStairsDumpTests
     /// retail skips and our building-mesh extraction mishandles?
     /// </summary>
     [Fact]
+    [Trait("Purpose", "Diagnostic")]
     public void DumpHallModel_PolyFlagHistogram()
     {
         var datDir = ConformanceDats.ResolveDatDir();

tests/AcDream.Core.Tests/Conformance/ThresholdDivergenceDiagnosticTests.cs

@@ -13,6 +13,7 @@ namespace AcDream.Core.Tests.Conformance;
 /// FindCellList result — so the P0→P1 divergence is precisely characterized
 /// (real pick-criterion divergence vs a test/sphere artifact).
 /// </summary>
+[Trait("Purpose", "Diagnostic")]
 public class ThresholdDivergenceDiagnosticTests
 {
     private readonly ITestOutputHelper _out;