docs(comments): drop history narration, keep the why

Rewrite comments that told the story of past rounds instead of the
current code: dated "fixed on / tried on / reverted on" notes, "this used
to...", "stale paragraph removed", "Phase 1/2" progress labels, and the
"ClassifyTile still does not use ClassifyBox" claim (it does now, via
VF_ClassifyBoxWithWarpRetry). Every invariant, unit, sign convention,
trap and measurement that justified the design is kept, rephrased in the
present tense and in its original language (French or English).

Also fix comments that named symbols removed in the dead-code commit
(EvaluateSDF wrapper, FTunnelCoreWorldEvaluation support-floor fields,
BlendChunks -> TransitionBlendChunks) and the stale function name in the
VF_RollStrateParamsDetailed determinism checkf message.

Comment and message text only; no code token changed. Tests untouched.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01URDGLsu7c4nunqNFPJEFPU

Source/VoxelForge/Private/VoxelWorld.cpp

@@ -23,11 +23,10 @@
 #include "VoxelTilePostReach.h"
 #include "VoxelClipmapDesiredTiles.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.
+// APawn doit être COMPLET — `Casts.h` n'en donne qu'une déclaration avant. APlayerController n'est
+// complet que par transitivité : on l'inclut explicitement.
 // GetPlayerPosition dereferences the pawn, so APawn must be COMPLETE — Casts.h only forward-declares
-// it. APlayerController was complete transitively only; include it explicitly.
+// it. APlayerController is complete only transitively; include it explicitly.
 #include "GameFramework/Pawn.h"
 #include "GameFramework/PlayerController.h"
 #include "GameFramework/PawnMovementComponent.h"
@@ -185,11 +184,11 @@ AVoxelWorld::AVoxelWorld()
 //=============================================================================
 // T1.f — build the RMC geometry buffers OFF the game thread.
 //=============================================================================
-// FRealtimeMeshStreamSet is plain CPU data; the per-vertex/per-triangle builder loop used to run
-// in ApplyMeshToTile ON THE GAME THREAD, where it was the dominant streaming cost (game thread
-// >6 ms while moving, GPU/draw idle). It touches ONLY the POD MeshData arrays — no UObject, no
-// generator — so it's safe on the gen worker. The game thread then just uploads the finished
-// streams (CreateSectionGroup). Byte-identical geometry; the only thing that moved is WHERE it runs.
+// FRealtimeMeshStreamSet is plain CPU data; on the game thread (in ApplyMeshToTile) the
+// per-vertex/per-triangle builder loop is the dominant streaming cost (game thread >6 ms while
+// moving, GPU/draw idle). It touches ONLY the POD MeshData arrays — no UObject, no generator — so
+// it's safe on the gen worker. The game thread then just uploads the finished streams
+// (CreateSectionGroup). Byte-identical geometry; only WHERE it runs differs.
 static void BuildTileStreamSet(RealtimeMesh::FRealtimeMeshStreamSet& Streams, const FVoxelMeshData& MeshData)
 {
     RealtimeMesh::TRealtimeMeshBuilderLocal<uint32, FPackedNormal, FVector2DHalf, 1> Builder(Streams);
@@ -8044,7 +8043,7 @@ void AVoxelWorld::UnloadTile(const FVoxelTileKey& Tile)
     CollisionNotRequiredTiles.Remove(Tile);
     CollisionSolidTiles.Remove(Tile);
     PendingCollisionCooks.Remove(Tile);
-    // Water + decorations are no longer tile-bound (water is one player-following ocean plane via
+    // Water + decorations are not tile-bound (water is one player-following ocean plane via
     // UpdateWater; decorations stream by distance via UpdateDecorations) — nothing to clear per tile.
     if (URealtimeMeshComponent** Comp = TileComponents.Find(Tile))
     {
@@ -8220,7 +8219,7 @@ bool AVoxelWorld::ApplyMeshToTile(FChunkResult& Result)
     }
     BindRealtimeMeshCollisionEvent(RTMesh);
     // Shadow casting: far (level >= 2) tiles never cast; the sky-cap SECTION never casts either
-    // — otherwise the high rock ceiling shadows the entire terrain below it. F17: shadow is now
+    // — otherwise the high rock ceiling shadows the entire terrain below it. F17: shadow is
     // PER SECTION, so a mixed tile keeps its ground shadow while its cap stays shadowless.
     const bool bCastShadow = (Tile.Level <= 1);
     MeshComp->SetCastShadow(bCastShadow);
@@ -8340,7 +8339,7 @@ bool AVoxelWorld::ApplyMeshToTile(FChunkResult& Result)
             TotalSeconds);
     }
 
-    // Water is no longer spawned per tile — it's a single player-following ocean plane (UpdateWater,
+    // Water is not spawned per tile — it's a single player-following ocean plane (UpdateWater,
     // driven from Tick), so it renders at every LOD and to the horizon with no per-tile gaps.
     return true;
 }
@@ -9022,9 +9021,9 @@ void AVoxelWorld::UpdateOrbLightMPC()
             const FVoxelActiveOrb& O = Orbs[i];
             V = FLinearColor((float)O.WorldPos.X, (float)O.WorldPos.Y, (float)O.WorldPos.Z, O.FalloffWorld);
         }
-        // ALWAYS write, even when unchanged. A skip-if-identical cache was tried here and BROKE the
-        // lighting: the MPC's world INSTANCE can be reset/recreated behind our back (PIE init order,
-        // asset recompile), and a cached skip then leaves it holding defaults forever. The per-frame
+        // ALWAYS write, even when unchanged. A skip-if-identical cache BREAKS the lighting: the
+        // MPC's world INSTANCE can be reset/recreated behind our back (PIE init order, asset
+        // recompile), and a cached skip then leaves it holding defaults forever. The per-frame
         // rewrite is what makes the collection self-healing — and 4 vector writes cost nothing.
         UKismetMaterialLibrary::SetVectorParameterValue(this, OrbLightMPC, OrbNames[i], V);
     }