feat(render) Campaign FW1: the degrade-level BSP gate kills the wrong punches

The offline degrade probe proved the mechanism: every Holtburg building
carries PORT nodes ONLY in its level-0 GfxObj (out to ~24-48 m); every
degraded level has zero. Retail walks the CURRENT degrade level BSP
(part->gfxobj[deg_level]) - that is what limits look-in punches to the
nearest buildings. WalkBuilding gains the degrade ladder +
SelectDrawingBsp (band pick; UpdateViewerDistance hysteresis is a port
TODO), the walk selects per viewer distance, the adapter builds
per-level BSPs, and the stab-list load rule (CLandBlock::init_buildings
@0052fd80: a full-res block loads exactly its buildings portal stab
cells) replaces load-everything in the landscape builder. The sweep now
shows clean rosters with all far-building punches gone; remaining
deltas: the near buildings 001a/0022 (50 m/28 m center distance vs the
48 m band edge - sphere-adjusted distance/hysteresis to port) and the
one ring-1 frustum boundary pair (aab50002/a9b3003c).

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

tests/AcDream.App.Tests/Rendering/Walk/WalkLookInGateSweepTests.cs

@@ -24,13 +24,7 @@ public sealed class WalkLookInGateSweepTests
         public void Emit(in WalkEvent walkEvent) => Events.Add(walkEvent);
     }
 
-    [Fact(Skip = "Adjudicated 2026-08-30: NO gate decode reproduces retail, and "
-        + "the join diagnostic proves the data is right — the missing mechanism "
-        + "is CEnvCell::GetVisible's LOADED-interior-cell gate (retail punched "
-        + "only the two buildings nearest the player; their interiors were "
-        + "loaded, farther ones were not; the replay loads everything). Port "
-        + "the interior load radius (landcell stab-list pull around the "
-        + "player) and re-run this sweep to pin the plane/side decode.")]
+    [Fact]
     public void Sweep_the_lookin_gate_decodes_against_the_street_fixture()
     {
         string? datDir = CornerFloodReplayTests.ResolveDatDir();