refactor(render): publish the walk visible-cell set

src/AcDream.Core/Lighting/LightManager.cs

@@ -271,9 +271,8 @@ public sealed class LightManager
     /// geometrically closer than the player's own room's torches and win the cap,
     /// leaving the visible room dark. Scoping candidacy to the frame's actual
     /// visible cells (the render already computes this — callers pass last frame's
-    /// <c>RetailPViewFrameResult.InViewCells</c>, the main flood PLUS building
-    /// look-in cells, one frame of latency, to avoid re-threading a mid-render
-    /// callback; flood-only scoping darkened look-in rooms' lanterns) removes
+    /// retail-walk visited-cell set, one frame of latency, to avoid re-threading
+    /// a mid-render callback) removes
     /// non-visible cells from contention before the
     /// cap ever applies. The distance-sort anchor stays the PLAYER either way — this
     /// parameter only narrows candidacy, it does not change the sort (the #176