feat(render) Campaign FW3.3: ShellDrawLiftZ is RETIRED - cells draw at the dat origin

Retail draws cell geometry at the dat EnvCell origin verbatim; the
0.02 m lift was our z-fight stand-in (register row AP-32, deleted in
this commit). With the walk owning retail draw ORDER under
WorldDepthContract Less (first-drawn-wins: DrawBlock terrain-then-
objects per cell, DrawCells shells-then-contents), the coplanar
tie-breaks the lift compensated for are now resolved the way retail
resolves them.

Deleted at every site: the PortalVisibilityBuilder const + the
drawLiftZ Build parameter and its lifted exit-portal projection branch
(gate and drawn geometry now share ONE space); the seal/punch fan
lifts (DrawPortalDepthWrite + the walk's DrawWalkPunchFan); the
LandblockBuildFactory drawn-cell-transform lift (render and physics
share the one verbatim transform).

The #130 proof flipped exactly as its own doc predicted:
UnliftedGate_LeavesTheStripAtTheDrawnTopEdge is deleted (its premise -
gate space != drawn space - no longer exists), and the renamed
ExitDoorTopEdge_GateCoversTheDrawnApertureWithinPixelTolerance sweep
(147 eye/gaze combos at the Holtburg corner door) passes with both in
the same unlifted space (worst plane gap <= 1.2 px, scissor <= 0.15 px
- unchanged tolerances). Ten more replay-test call sites swept to the
new Build signature.

Suites: full Release build 0 warnings; hermetic 6,750/0; the 21
affected InstalledDat replay tests green; Walk conformance 40/1
untouched.

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

src/AcDream.App/Rendering/RetailPViewPassExecutor.WalkLeaf.cs

@@ -78,9 +78,8 @@ internal sealed partial class RetailPViewPassExecutor
     /// <summary>The walk's punch-fan turn — <c>DrawPortalPolyInternal</c>
     /// @0x0059bc90's far-Z punch through <c>PortalDepthMaskRenderer</c>,
     /// clipped by the pinned view's slice planes (retail
-    /// <c>building_view</c> @0x0059f3bf). The +<c>ShellDrawLiftZ</c>
-    /// matches today's <c>DrawPortalDepthWrite</c> and retires with
-    /// FW3.3.</summary>
+    /// <c>building_view</c> @0x0059f3bf). FW3.3: fans draw at the dat
+    /// aperture verbatim (the ShellDrawLiftZ retirement).</summary>
     internal void DrawWalkPunchFan(
         RetailPViewFrameInput frame,
         ClipFrameAssembly clipAssembly,
@@ -100,10 +99,7 @@ internal sealed partial class RetailPViewPassExecutor
         Span<Vector3> world = stackalloc Vector3[32];
         int count = Math.Min(vertices.Length, world.Length);
         for (int vertex = 0; vertex < count; vertex++)
-        {
             world[vertex] = vertices[vertex];
-            world[vertex].Z += PortalVisibilityBuilder.ShellDrawLiftZ;
-        }
         _portalDepthMask.DrawDepthFan(
             world[..count],
             frame.ViewProjection,
@@ -134,9 +130,8 @@ internal sealed partial class RetailPViewPassExecutor
 /// @0x0059f170 draws per cell at its flood turn).</item>
 /// <item><see cref="DrawPunchFan"/> → <c>PortalDepthMaskRenderer.DrawDepthFan</c>
 /// with <c>forceFarZ</c>, clipped by the pinned view's slice planes
-/// (retail <c>building_view</c> @0x0059f3bf). The +<c>ShellDrawLiftZ</c>
-/// on the fan verts matches today's <c>DrawPortalDepthWrite</c> and
-/// retires with FW3.3.</item>
+/// (retail <c>building_view</c> @0x0059f3bf); FW3.3 draws fans at the dat
+/// aperture verbatim (the ShellDrawLiftZ retirement).</item>
 /// <item><see cref="ClearInteriorDepth"/>/<see cref="DrawExitSeals"/> →
 /// caller-supplied actions (the renderer owns the pass scope and the
 /// root-flood seal iteration; the adapter only provides the turns).</item>