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/Public/VoxelWorld.h

@@ -1246,8 +1246,8 @@ public:
     // Desired-set membership STAMPÉE : clé → numéro du dernier crossing où la tuile était désirée.
     // BuildDesiredTiles upserte le stamp courant puis balaie la map UNE fois : les entrées à stamp
     // périmé sont les "leavers" (retirées + renvoyées). Le cull ne considère que ces leavers + la
-    // TransitionHold — fini le scan O(toutes-les-tuiles-chargées) à chaque crossing (le spike
-    // CullTiles ~1.6 ms/crossing de la trace 2026-07-05).
+    // TransitionHold — pas de scan O(toutes-les-tuiles-chargées) à chaque crossing (un tel scan
+    // coûtait ~1.6 ms/crossing dans CullTiles).
     TMap<FVoxelTileKey, uint32> DesiredStamped;
     uint32 DesiredStamp = 0;
     bool IsDesired(const FVoxelTileKey& T) const