fix #130 (the real strip): drawn-shell lift vs draw-space portal consumers

The user's re-gate refuted the scissor fix as THE strip (6c4b6d6 was a
real but sub-pixel under-coverage): the strip survived, screenshot at a
doorway, full width of the opening, top edge only, "very subtle".

Root cause (pinned by Issue130DoorwayStripTests.UnliftedGate_*): the
+0.02 m shell render lift. Cell shells DRAW 2 cm above the dat origin
(z-fight vs coplanar terrain); f35cb8b (the #119-residual fix,
2026-06-11) deliberately reverted the VISIBILITY graph to the physics
(unlifted) transform - but the OutsideView color gate (terrain/sky/
scissor through the doorway) and the seal/punch depth fans are
DRAW-space consumers and kept projecting the unlifted polygons. The
drawn lintel therefore sits one lift-projection above the gate's top
edge - measured 6.7 px at a 2.4 m doorway - and that band never
receives terrain/sky color while the seal also stamps 2 cm low.
A regression from f35cb8b, NOT from the W=0 clip port (987313a stays
exonerated). Vertical aperture edges are immune (the lift slides them
along themselves) - top edge only, exactly as reported; explains the
"also NOW" timing precisely.

Fix - draw space draws lifted, visibility stays physics (the f35cb8b
invariant, now symmetric):
- PortalVisibilityBuilder.Build gains drawLiftZ: the exit-portal branch
  projects the OutsideView region with the lifted transform; flood
  admission, side tests, and CellViews are untouched (default 0 keeps
  every existing visibility test bit-identical).
- The seal/punch fans (DrawRetailPViewPortalDepthWrite) lift their
  world verts to the drawn shell's space.
- One shared constant PortalVisibilityBuilder.ShellDrawLiftZ feeds the
  shell registration (GameWindow:5604), the gate, and the fans.

Register: AP-32 ADDED - the +0.02 lift had NO row (a pre-register
deviation the 2026-06-12 sweep missed). The row records the split
invariant both ways: a draw-space consumer that forgets the lift
re-opens the #130 strip; a visibility consumer that picks the lifted
transform re-opens the #119-residual side-cull.

Pins: the lifted gate covers the drawn (lifted) aperture to 0.00 px
across the 147-combo sweep; the unlifted gate shows the 6.7 px strip
(sensitivity proof - if the lift is ever removed, this test says the
drawLiftZ plumbing can go too).

Suites: App 257+1skip / Core 1439+2skip / UI 420 / Net 294 green.
Awaiting the user re-gate at a doorway with the lintel on screen.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.App/Rendering/GameWindow.cs

@@ -5599,9 +5599,13 @@ public sealed class GameWindow : IDisposable
                         _pendingCellMeshes[envCellId] = cellSubMeshes;
 
                         // Keep the small render lift out of physics; retail BSP
-                        // contact planes use the EnvCell origin verbatim.
+                        // contact planes use the EnvCell origin verbatim. The lift
+                        // constant is shared with every draw-space consumer of
+                        // portal polygons (OutsideView gate, seal/punch fans) —
+                        // see PortalVisibilityBuilder.ShellDrawLiftZ (#130).
                         var physicsCellOrigin = envCell.Position.Origin + lbOffset;
-                        var cellOrigin = physicsCellOrigin + new System.Numerics.Vector3(0f, 0f, 0.02f);
+                        var cellOrigin = physicsCellOrigin + new System.Numerics.Vector3(
+                            0f, 0f, AcDream.App.Rendering.PortalVisibilityBuilder.ShellDrawLiftZ);
                         var cellTransform =
                             System.Numerics.Matrix4x4.CreateFromQuaternion(envCell.Position.Orientation) *
                             System.Numerics.Matrix4x4.CreateTranslation(cellOrigin);
@@ -9699,9 +9703,16 @@ public sealed class GameWindow : IDisposable
             if (localVerts.Length < 3)
                 continue;
 
+            // cell.WorldTransform is the PHYSICS (unlifted) transform (f35cb8b);
+            // the shell that rasterizes this aperture draws +ShellDrawLiftZ
+            // higher. The seal/punch is a DRAW — stamp depth in the same lifted
+            // space or the stamp sits 2 cm below the drawn hole (#130 family).
             int n = System.Math.Min(localVerts.Length, world.Length);
             for (int v = 0; v < n; v++)
+            {
                 world[v] = System.Numerics.Vector3.Transform(localVerts[v], cell.WorldTransform);
+                world[v].Z += AcDream.App.Rendering.PortalVisibilityBuilder.ShellDrawLiftZ;
+            }
 
             _portalDepthMask.DrawDepthFan(world[..n], viewProjection, sliceCtx.Slice.Planes, forceFarZ);
         }