fix(strate): opt-in diagnostic must not fail the automation suite

Sol's opt-in warning logs at Warning. UE's automation framework counts a
Warning as a failure, and the Determinism.* tests deliberately build a
NON-opted-in world -- that world is their comparison oracle, the baseline every
OpStack.* number is measured against. The diagnostic was failing the suite by
correctly reporting an intentional configuration.

Verbosity is now Log under GIsAutomationTesting and Warning otherwise. The
message is written once and only the verbosity branches (Printf then log %s):
four copies of a long format string across two sites would have been exactly
the "one definition, not two kept in sync" failure this project has rules
about. CoreGlobals.h included explicitly for GIsAutomationTesting -- IWYU, no
shared PCH here.

Note for the record: the tests must NOT be switched to the op stack. The
non-opted-in fixture is the oracle, not an oversight.

The diagnostic also did its job: 7/7 cave slots report disabled in the fixture
(slot 4 absent = the SurfaceWorld narrowing working). The same line read from
the GAME log is now the ground truth for whether T1.d has ever been enabled in
production.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Source/VoxelForge/Private/VoxelStrateManager.cpp

@@ -2,6 +2,7 @@
 // Runtime strate layout generation and queries.
 
 #include "VoxelStrateManager.h"
+#include "CoreGlobals.h"  // GIsAutomationTesting — the opt-in diagnostic stays quiet under tests
 #include "VoxelSettings.h"
 #include "VoxelTypes.h"  // For CHUNK_SIZE, VOXEL_SIZE, WorldToChunkCoord
 #include "VoxelCaveMorphology.h"  // For VoxelSDF and VoxelHash
@@ -149,11 +150,23 @@ void UVoxelStrateManager::Initialize(UVoxelSettings* Settings, int32 WorldSeed)
         }
     }
 
+    // ⚠️ WARNING EN ÉDITEUR/JEU, JAMAIS EN TEST. Les tests `Determinism.*` construisent
+    // DÉLIBÉRÉMENT un monde non opt-in — c'est leur oracle de comparaison — et le framework
+    // d'automatisation compte un Warning comme un échec. Un diagnostic ne doit pas casser la suite
+    // qu'il est censé éclairer. Le message reste écrit UNE fois : seule la verbosité change.
+    // Warning in editor/game where it is actionable, never in tests: the Determinism.* tests build
+    // a non-opted-in world ON PURPOSE as their comparison oracle, and the automation framework
+    // treats a Warning as a failure. One message, two verbosities.
+    const bool bQuietDiagnostic = GIsAutomationTesting;
+
     if (NumOperatorStackDisabledCaves > 0)
     {
-        UE_LOG(LogTemp, Warning,
+        const FString Summary = FString::Printf(
             TEXT("[StrateManager] Operator-stack opt-in: %d/%d cave layout slots have Use Operator Stack disabled. These slots cannot use operator-stack ClassifyBox/T1.d; enable the asset setting on the listed definitions if that is intended."),
             NumOperatorStackDisabledCaves, NumCaveSlots);
+
+        if (bQuietDiagnostic) { UE_LOG(LogTemp, Log,     TEXT("%s"), *Summary); }
+        else                  { UE_LOG(LogTemp, Warning, TEXT("%s"), *Summary); }
     }
     else
     {
@@ -171,12 +184,15 @@ void UVoxelStrateManager::Initialize(UVoxelSettings* Settings, int32 WorldSeed)
             continue;
         }
 
-        UE_LOG(LogTemp, Warning,
+        const FString Line = FString::Printf(
             TEXT("[StrateManager]   cave slot=%d name='%s' Z chunks=[%d to %d] bUseOperatorStack=false"),
             Slot.StrateIndex,
             *Slot.Definition->StrateName.ToString(),
             Slot.TopChunkZ,
             Slot.BottomChunkZ);
+
+        if (bQuietDiagnostic) { UE_LOG(LogTemp, Log,     TEXT("%s"), *Line); }
+        else                  { UE_LOG(LogTemp, Warning, TEXT("%s"), *Line); }
     }
 
     CachedSeed = WorldSeed;