diff --git a/UnrealHyperTwist/Source/UnrealHyperTwist/Private/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.cpp b/UnrealHyperTwist/Source/UnrealHyperTwist/Private/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.cpp
index 103a782..8b67d8f 100644
--- a/UnrealHyperTwist/Source/UnrealHyperTwist/Private/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.cpp
+++ b/UnrealHyperTwist/Source/UnrealHyperTwist/Private/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.cpp
@@ -493,6 +493,43 @@ UHyperTwistTrainingMediaExportLibrary::BuildBundledMediaExportReferenceBundle()
 	return Bundle;
 }
 
+bool FHyperTwistTrainingClassicCubeMediaExportPlan::IsStructurallyValid() const
+{
+	return !PlanVersion.IsEmpty()
+		&& !ReplayId.IsEmpty()
+		&& !PuzzleId.IsEmpty()
+		&& !MapPath.IsEmpty()
+		&& !LevelSequencePath.IsEmpty()
+		&& !VideoRoute.IsEmpty()
+		&& !StillRoute.IsEmpty()
+		&& !ShareImageRoute.IsEmpty()
+		&& !OutputDirectory.IsEmpty()
+		&& !OutputBaseName.IsEmpty()
+		&& !VideoOutputDirectory.IsEmpty()
+		&& !StillOutputDirectory.IsEmpty()
+		&& !ValidationDirectory.IsEmpty()
+		&& !ExpectedVideoPath.IsEmpty()
+		&& !ExpectedStillFramePath.IsEmpty()
+		&& !ExpectedShareCardPath.IsEmpty()
+		&& !ExpectedReportPath.IsEmpty()
+		&& !ExpectedVideoReportPath.IsEmpty()
+		&& !ExpectedStillReportPath.IsEmpty()
+		&& OutputWidth > 0
+		&& OutputHeight > 0
+		&& OutputFrameRate > 0
+		&& ReplayDurationMs >= 0
+		&& TailDurationMs >= 0
+		&& RenderStartFrame >= 0
+		&& RenderEndFrame > RenderStartFrame
+		&& StillFrame >= RenderStartFrame
+		&& StillFrame < RenderEndFrame
+		&& MoveCount >= 0
+		&& InspectionTimeMs >= 0
+		&& FinalTimeMs >= 0
+		&& ReviewAnchorCount >= 0;
+}
+
+
 bool UHyperTwistTrainingMediaExportLibrary::TryGetPackageReferenceById(
 	const FHyperTwistTrainingMediaExportReferenceBundle& Bundle,
 	const FString& PackageId,
diff --git a/UnrealHyperTwist/Source/UnrealHyperTwist/Public/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.h b/UnrealHyperTwist/Source/UnrealHyperTwist/Public/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.h
index 81519d0..5488f56 100644
--- a/UnrealHyperTwist/Source/UnrealHyperTwist/Public/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.h
+++ b/UnrealHyperTwist/Source/UnrealHyperTwist/Public/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.h
@@ -426,41 +426,7 @@ struct FHyperTwistTrainingClassicCubeMediaExportPlan
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "HyperTwist")
 	bool bCanExportShareImage = false;
 
-	bool IsStructurallyValid() const
-	{
-		return !PlanVersion.IsEmpty()
-			&& !ReplayId.IsEmpty()
-			&& !PuzzleId.IsEmpty()
-			&& !MapPath.IsEmpty()
-			&& !LevelSequencePath.IsEmpty()
-			&& !VideoRoute.IsEmpty()
-			&& !StillRoute.IsEmpty()
-			&& !ShareImageRoute.IsEmpty()
-			&& !OutputDirectory.IsEmpty()
-			&& !OutputBaseName.IsEmpty()
-			&& !VideoOutputDirectory.IsEmpty()
-			&& !StillOutputDirectory.IsEmpty()
-			&& !ValidationDirectory.IsEmpty()
-			&& !ExpectedVideoPath.IsEmpty()
-			&& !ExpectedStillFramePath.IsEmpty()
-			&& !ExpectedShareCardPath.IsEmpty()
-			&& !ExpectedReportPath.IsEmpty()
-			&& !ExpectedVideoReportPath.IsEmpty()
-			&& !ExpectedStillReportPath.IsEmpty()
-			&& OutputWidth > 0
-			&& OutputHeight > 0
-			&& OutputFrameRate > 0
-			&& ReplayDurationMs >= 0
-			&& TailDurationMs >= 0
-			&& RenderStartFrame >= 0
-			&& RenderEndFrame > RenderStartFrame
-			&& StillFrame >= RenderStartFrame
-			&& StillFrame < RenderEndFrame
-			&& MoveCount >= 0
-			&& InspectionTimeMs >= 0
-			&& FinalTimeMs >= 0
-			&& ReviewAnchorCount >= 0;
-	}
+	bool IsStructurallyValid() const;
 };
 
 UCLASS()
diff --git a/docs/v6_5_deep_manual_pack/HyperTwist/DEVELOPMENT.md b/docs/v6_5_deep_manual_pack/HyperTwist/DEVELOPMENT.md
index e49eb70..96e041e 100644
--- a/docs/v6_5_deep_manual_pack/HyperTwist/DEVELOPMENT.md
+++ b/docs/v6_5_deep_manual_pack/HyperTwist/DEVELOPMENT.md
@@ -535,6 +535,34 @@ Latest same-day core header cleanup follow-up still on `2026-06-25`:
   - if we continue this structural hardening lane, the next honest family is
     now viewer/training or a return to the remaining smaller memory seams
 
+Latest same-day training media-export header cleanup follow-up still on
+`2026-06-25`:
+
+- the next bounded training-family packet then moved
+  `FHyperTwistTrainingClassicCubeMediaExportPlan::IsStructurallyValid()` out of
+  `Public/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.h` and into
+  `Private/HyperTwistTraining/HyperTwistTrainingMediaExportLibrary.cpp`
+- that keeps the heavier classic-cube export-plan validation beside the live
+  media-export reference bundle and plan-construction routines already owned by
+  the training media-export library instead of leaving the public training
+  export header to carry the lead validator inline
+- `scripts/run-hypertwist-sentrux-source-only.sh` then improved again to:
+  - `Quality: 6197`
+  - all `7` rules passing
+- the overall public-header inline-validator hotspots now shift again toward
+  viewer plus the remaining smaller recognition and memory seams:
+  - `36` lines for the current `HyperTwistViewerTypes.h` lead seam
+  - `30` lines for `FHyperTwistVisionCommittedFaceState`
+  - `30` lines for `FHyperTwistMemoryCognitiveFact`
+  - `28` lines for `FHyperTwistMemoryDigestView`
+  - `27` lines for the remaining memory-state cluster
+- current truthful “vanilla refactor” reading tightens again:
+  - the training media-export header is no longer a meaningful large
+    inline-validator hotspot
+  - the next honest structural continuation is now either the viewer family or
+    a return to the remaining smaller memory seams, not more training
+    media-export cleanup
+
 Latest same-day browser/distribution continuity follow-up still on `2026-06-24`:
 
 - auth-entry, protected-route loading, dashboard auth health, and release-authority fallback states now share a more deliberate operator-facing recovery shape instead of scattering single-line warnings across public and protected surfaces