diff --git a/src/AcDream.App/Rendering/Walk/WalkWorldDatAdapter.cs b/tests/AcDream.App.Tests/Rendering/Walk/WalkWorldDatAdapter.cs
similarity index 94%
rename from src/AcDream.App/Rendering/Walk/WalkWorldDatAdapter.cs
rename to tests/AcDream.App.Tests/Rendering/Walk/WalkWorldDatAdapter.cs
index 5e9fdcd7..db7d6bd8 100644
--- a/src/AcDream.App/Rendering/Walk/WalkWorldDatAdapter.cs
+++ b/tests/AcDream.App.Tests/Rendering/Walk/WalkWorldDatAdapter.cs
@@ -4,12 +4,18 @@ using DatReaderWriter.DBObjs;
 using DatReaderWriter.Types;
 using Environment = DatReaderWriter.DBObjs.Environment;
 
-namespace AcDream.App.Rendering.Walk;
+namespace AcDream.App.Tests.Rendering.Walk;
+
+using AcDream.App.Rendering.Walk;
 
 /// <summary>
-/// Campaign FW1 — builds the walk's world model from real DAT data. The
-/// library parses everything the walk needs (survey 2026-08-30: PORT nodes
-/// with <c>PortalRef{PolyId, PortalIndex}</c> in retail field order, cell
+/// Campaign FW1 — builds the walk's world model from real DAT data for the
+/// CONFORMANCE HARNESS (it lives in the test assembly deliberately: raw
+/// <c>DatCollection</c> access is fenced to the content-owner seam in
+/// production by <c>RuntimeDatAccessArchitectureTests</c>; the FW3
+/// production adapter will consume the seam instead). The library parses
+/// everything the walk needs (survey 2026-08-30: PORT nodes with
+/// <c>PortalRef{PolyId, PortalIndex}</c> in retail field order, cell
 /// portal records with the PortalSide flag bit, building portals with stab
 /// lists); this adapter is the previously missing consumer.
 ///