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/VoxelForgeEditor/Private/VoxelForgeExploreCommandlet.cpp

@@ -739,7 +739,7 @@ bool ParseArguments(const FString& Params, FExploreArguments& OutArguments, FStr
         OutError = TEXT("rendermaxdistance must be finite and in (0,2048] voxels.");
         return false;
     }
-    // Render no longer budgets density samples: pixels are rasterised from the one canonical
+    // Render does not budget density samples: pixels are rasterised from the one canonical
     // mesh. Keep the legacy renderstep/maxdistance arguments for compatible invocations and use
     // only maxdistance as the raster depth clip.
     if (OutArguments.ExportSize < CHUNK_SIZE