T1 (fused BR-2/3): retail frame order - dynamics last, punch+seal, shell chop deleted

The complete retail drawing order in one installment (per the amended plan:
every installment is a COMPLETE retail behavior - the half-ported punch of
88be519 is re-landed here WITH the ordering that makes it correct):

  static world (sky/terrain/weather/shells/scenery)
    -> aperture depth writes (interior SEAL at true depth / outdoor+look-in
       PUNCH to far-Z; PortalDepthMaskRenderer, DrawPortalPolyInternal
       Ghidra 0x0059bc90)
    -> interior cells WHOLE, far-to-near, drawn once (DrawCells Loop 2,
       Ghidra 0x005a4840; use_built_mesh pc:427905)
    -> per-cell STATIC object lists
    -> ALL dynamics LAST (DrawDynamicsLast), depth-tested, never hard-clipped

InteriorEntityPartition: new contract - every ServerGuid != 0 entity goes
to Dynamics regardless of cell (indoor/outdoor/unresolved/hidden); ByCell
carries only dat-baked indoor statics of visible cells; Outdoor renamed
OutdoorStatic. Fixes the audit's livedynamic-invisible-under-interior-roots
divergence as a side effect (live entities are never dropped by the
visibility set; culling is T3's viewcone).

DELETED (retail has no counterpart): the gl_ClipDistance shell chop
(927fd8f enable + 9ce335e outdoor scoping + UseShellClipRouting + the
per-slice shell loop + clipShells param) - retail never clips cell
geometry; aperture exactness = punch/seal + z-buffer + this order. The
old per-slice scissored AABB depth clear is replaced by retail's single
gated full clear (ClearDepthForInterior). The interior-root LiveDynamic
top-up draw and the look-in's dynamics involvement are gone (one last
pass, no double-draws).

Closes at the T5 gate (expected): #114 (chop deleted), the char-eaten-by-
doorway regression (ordering), outdoor interiors-through-doorways (punch);
#108's render half (seal) - its membership half stays re-attributed.

Suites: build green, App 226 green (partition tests rewritten to the T1
contract), Core 1398 + 4 pre-existing #99-era + 1 skip.

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

tests/AcDream.App.Tests/Rendering/InteriorEntityPartitionTests.cs

@@ -6,6 +6,19 @@ using Xunit;
 
 namespace AcDream.App.Tests.Rendering;
 
+/// <summary>
+/// T1 (fused BR-2/3) partition contract — retail draw order: static world
+/// first, every server-spawned DYNAMIC in the frame's single LAST pass.
+/// <list type="bullet">
+///   <item>ALL ServerGuid != 0 entities land in <c>Dynamics</c> regardless of
+///   cell (indoor, outdoor, unresolved, even non-visible cells — retail never
+///   drops a live entity for visibility-set reasons; culling is the
+///   viewcone's job, T3).</item>
+///   <item><c>ByCell</c> carries only dat-baked indoor statics of VISIBLE
+///   cells (drawn with their cell).</item>
+///   <item><c>OutdoorStatic</c> carries shells/scenery (the world pass).</item>
+/// </list>
+/// </summary>
 public class InteriorEntityPartitionTests
 {
     private const uint CellA = 0xA9B40170;
@@ -30,7 +43,7 @@ public class InteriorEntityPartitionTests
                     (IReadOnlyDictionary<uint, WorldEntity>?)null) };
 
     [Fact]
-    public void Partitions_LiveAndStaticEntities_ByCellOutdoorAndFallback()
+    public void AllServerSpawned_GoToDynamics_StaticsSplitByCellAndOutdoor()
     {
         var unresolvedLive = Ent(1, serverGuid: 0x5000000A, parentCell: null);
         var liveNpcInCell = Ent(2, serverGuid: 0x80001234, parentCell: CellA);
@@ -43,22 +56,25 @@ public class InteriorEntityPartitionTests
         var result = InteriorEntityPartition.Partition(
             visible, OneLb(0xA9B4FFFF, unresolvedLive, liveNpcInCell, staticA, staticB, scenery, liveOutdoor));
 
-        Assert.Single(result.LiveDynamic);
-        Assert.Contains(unresolvedLive, result.LiveDynamic);
+        // Every server-spawned entity is a dynamic — drawn in the last pass.
+        Assert.Equal(3, result.Dynamics.Count);
+        Assert.Contains(unresolvedLive, result.Dynamics);
+        Assert.Contains(liveNpcInCell, result.Dynamics);
+        Assert.Contains(liveOutdoor, result.Dynamics);
 
-        Assert.Equal(2, result.ByCell[CellA].Count);
-        Assert.Contains(liveNpcInCell, result.ByCell[CellA]);
+        // Indoor statics ride with their (visible) cell.
+        Assert.Single(result.ByCell[CellA]);
         Assert.Contains(staticA, result.ByCell[CellA]);
         Assert.Single(result.ByCell[CellB]);
         Assert.Contains(staticB, result.ByCell[CellB]);
 
-        Assert.Equal(2, result.Outdoor.Count);
-        Assert.Contains(scenery, result.Outdoor);
-        Assert.Contains(liveOutdoor, result.Outdoor);
+        // Outdoor statics (shells/scenery) ride with the world pass.
+        Assert.Single(result.OutdoorStatic);
+        Assert.Contains(scenery, result.OutdoorStatic);
     }
 
     [Fact]
-    public void IndoorEntity_InNonVisibleCell_IsDropped()
+    public void HiddenCell_DropsStatics_ButNeverDynamics()
     {
         var staticHidden = Ent(3, serverGuid: 0, parentCell: HiddenCell);
         var liveHidden = Ent(4, serverGuid: 0x80001234, parentCell: HiddenCell);
@@ -67,9 +83,14 @@ public class InteriorEntityPartitionTests
         var result = InteriorEntityPartition.Partition(
             visible, OneLb(0xA9B4FFFF, staticHidden, liveHidden));
 
+        // A static in a non-flooded cell is not drawn this frame…
         Assert.False(result.ByCell.ContainsKey(HiddenCell));
-        Assert.Empty(result.Outdoor);
-        Assert.Empty(result.LiveDynamic);
+        Assert.Empty(result.OutdoorStatic);
+
+        // …but a LIVE entity is never dropped by the visibility set (the old
+        // contract dropped it — the audit's livedynamic-invisible divergence).
+        Assert.Single(result.Dynamics);
+        Assert.Contains(liveHidden, result.Dynamics);
     }
 
     [Fact]
@@ -85,5 +106,7 @@ public class InteriorEntityPartitionTests
             new HashSet<uint> { CellA }, OneLb(0xA9B4FFFF, noMesh));
 
         Assert.False(result.ByCell.ContainsKey(CellA));
+        Assert.Empty(result.Dynamics);
+        Assert.Empty(result.OutdoorStatic);
     }
 }