test(phys): A6.P4 door inside-out — collision-geometry gap diagnosis

Added diagnostic apparatus that pinpoints the inside-out walkthrough
as a collision-geometry GAP, not a collision-detection bug.

New tests in DoorBugTrajectoryReplayTests:
- InsideOut_Tick3254_WithCottageWalls_ShouldBlock: hypothesis test that
  registered cottage GfxObj 0x01000A2B and replayed the captured tick.
  Cottage blocked sphere but with cn=(0,0,1) floor-cap normal, not a
  wall normal — first signal that cottage geometry near the sphere
  isn't a wall.
- Diagnostic_CottagePolys_NearWalkthroughPosition: dumps cottage polys
  near sphere XY=(133.655, 17.59) at any Z. Result: ZERO cottage
  polygons in that area. The cottage GfxObj has no geometry where the
  sphere walks through.

DoorSetupGfxObjInspectionTests.HoltburgCottage_CellPortals_DatInspection
extended to dump cell 0xA9B40150's 4 physics polygons in world frame:
- floor (Z=94), ceiling (Z=96.5), west wall (X=131.6), east wall (X=133.5)
- All walls only span Y=[16.5, 17.1] — the small doorway alcove volume
- North of Y=17.1, no wall

Captured sphere at (133.655, 17.59) is 0.155 m east of cell east wall
AND 0.49 m north of the wall's Y range. No collision geometry exists
at that XY past Y=17.1. The collision representation has a gap that
the visual cottage covers with a wall.

Production capture confirms the diagnosis: cottage GfxObj fires
[bsp-test] 425 times during inside-out walking — visibility IS
correct post-AddAllOutsideCells fix. Door slab fires 245 times. But
the BSP queries find no polygon at (133.655, 17.6+, 94-95.20). The
slab's east face blocks WEST motion (cn=(+1,0,0) as captured), sphere
free to move +Y past it because no wall is there to block.

Three candidates for next-session investigation:
1. Different cottage GfxObj (Holtburg cottages may be multi-piece)
2. Landblock-baked stab static at the cottage exterior wall location
3. Cottage GfxObj's visual polygons wider than physics polygons (dat fact)

Cheapest next step: add LandblockStatics_DatInspection test that
loads LandBlockInfo 0xA9B4FFFE + iterates StaticObjects + prints
every entity at world XY in [131,135] x [16,19]. Reveals what other
entities live at the cottage doorway.

Full handoff: docs/research/2026-05-25-door-bug-inside-out-geometry-gap.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/AcDream.Core.Tests/Physics/DoorSetupGfxObjInspectionTests.cs

@@ -314,6 +314,31 @@ public class DoorSetupGfxObjInspectionTests
         _out.WriteLine($"  CellStruct polygons     = {cellStruct.Polygons?.Count ?? 0} (visible)");
         _out.WriteLine($"  CellStruct physicsPolys = {cellStruct.PhysicsPolygons?.Count ?? 0}");
 
+        // Dump ALL physics polygons (collision walls/floor) in world frame
+        // so we can see what blocks a sphere at world (133.655, 17.59).
+        _out.WriteLine($"  CellStruct PHYSICS polys (world frame):");
+        var cellOrigin = envCell.Position.Origin;
+        var cellRot    = envCell.Position.Orientation;
+        for (int pi = 0; pi < cellStruct.PhysicsPolygons.Count; pi++)
+        {
+            var (pid, poly) = (cellStruct.PhysicsPolygons.Keys.ElementAt(pi),
+                               cellStruct.PhysicsPolygons.Values.ElementAt(pi));
+            float wxMin = float.MaxValue, wxMax = float.MinValue;
+            float wyMin = float.MaxValue, wyMax = float.MinValue;
+            float wzMin = float.MaxValue, wzMax = float.MinValue;
+            foreach (var vid in poly.VertexIds)
+            {
+                if (!cellStruct.VertexArray.Vertices.TryGetValue((ushort)vid, out var sv)) continue;
+                var rotated = System.Numerics.Vector3.Transform(sv.Origin, cellRot);
+                var world   = cellOrigin + rotated;
+                if (world.X < wxMin) wxMin = world.X; if (world.X > wxMax) wxMax = world.X;
+                if (world.Y < wyMin) wyMin = world.Y; if (world.Y > wyMax) wyMax = world.Y;
+                if (world.Z < wzMin) wzMin = world.Z; if (world.Z > wzMax) wzMax = world.Z;
+            }
+            _out.WriteLine($"    [{pi}=0x{pid:X4}] sides={poly.SidesType} " +
+                $"X=[{wxMin:F3},{wxMax:F3}] Y=[{wyMin:F3},{wyMax:F3}] Z=[{wzMin:F3},{wzMax:F3}]");
+        }
+
         // Dump the plane of each portal polygon (the planes
         // FindTransitCellsSphere tests the sphere center against).
         for (int i = 0; i < envCell.CellPortals.Count; i++)