build: complete the IWYU tail — APawn in VoxelWorld.cpp

VoxelWorld.cpp:526 dereferences the pawn, so APawn must be complete; Casts.h only
forward-declares it. Adds GameFramework/Pawn.h, and PlayerController.h which was
complete transitively only — the same fragility this change removes.

My earlier scan covered Public/ only. The shared PCH served .cpp files too, and
APawn was named in Build.cs's own error list. Everything else in the module
compiled, so this is the entire tail.

UNVERIFIED: not compiled.

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

OPSTACK-PROGRESS.md

@@ -1190,3 +1190,20 @@ exact-lattice `ClassifyTile` bound must both survive the port. `§C1` (bounded s
 open and still wants doing before too many more archetypes copy it.
 
 ---
+
+## 2026-07-27 — the IWYU tail was exactly one site.
+
+`VoxelWorld.cpp:526` — `PC->GetPawn()->GetActorLocation()` needs **`APawn` complete**, and `Casts.h`
+only forward-declares it. Added `GameFramework/Pawn.h`, plus `GameFramework/PlayerController.h`
+which was only complete *transitively* — the same fragility this whole change exists to remove.
+
+**My scan missed it because I only audited `Public/`.** The shared PCH served `.cpp` files too, and
+`APawn` was named in `Build.cs`'s original error list — I read that list and still scanned only the
+headers. Everything else in the module compiled, so this is the whole tail: one site, one build.
+
+**UNVERIFIED:** the fix.
+
+**Next single action:** rebuild. Then watch the perf number — `/fp:precise` on a noise-heavy hot
+path, checked against `ARCHITECTURE §8.10`. Then back to the opstack: `SurfaceWorld` (§5).
+
+---

Source/VoxelForge/Private/VoxelWorld.cpp

@@ -11,6 +11,14 @@
 #include "VoxelTerrainOpDefinition.h"
 #include "VoxelContentManager.h"
 #include "VoxelDensityVolume.h"
+// IWYU (FPSemantics = Precise ⇒ plus de PCH partagé) : GetPlayerPosition déréférence le pawn, donc
+// APawn doit être COMPLET — `Casts.h` n'en donne qu'une déclaration avant. APlayerController était
+// complet par transitivité seulement : on l'inclut explicitement, c'est exactement la fragilité
+// qu'on est en train de retirer.
+// GetPlayerPosition dereferences the pawn, so APawn must be COMPLETE — Casts.h only forward-declares
+// it. APlayerController was complete transitively only; include it explicitly.
+#include "GameFramework/Pawn.h"
+#include "GameFramework/PlayerController.h"
 #include "Materials/MaterialInstanceDynamic.h"
 #include "Materials/MaterialParameterCollection.h"
 #include "Kismet/KismetMaterialLibrary.h"

Source/VoxelForge/VoxelForge.Build.cs

@@ -54,6 +54,8 @@ public class VoxelForge : ModuleRules
 		// it — never to revert FPSemantics, which is now load-bearing for cross-platform play.
 		// Headers fixed on 2026-07-27: VoxelBiomeDefinition, VoxelSettings, VoxelStrateDefinition,
 		// VoxelStrateTypes, VoxelContentManager, VoxelAtmosphereManager, VoxelDensityVolume.
+		// Plus VoxelWorld.cpp (GameFramework/Pawn.h) — the .cpp files needed auditing too, not just
+		// the public headers. That was the whole residual tail: one site, found in one build.
 		// Expect a residual tail: the shared PCH hid these for years and only a build enumerates
 		// them all. VoxelDensityVolume's was the nasty one — ENABLE_DRAW_DEBUG is used in an #if,
 		// and an undefined macro there is silently 0 rather than an error.