feat(render): Phase A8 — indoor visibility + streaming fixes batch

Lands the working A8 indoor-rendering and streaming fixes accumulated this
session. User has verified these visually to some degree (e.g. lifestone /
translucent meshes confirmed fine under the FrontFace flip; bridge / wall /
collision regressions confirmed fixed after travel); not every path has been
exhaustively gated. The cellar-flap defect remains OPEN and will be solved
the retail-faithful way via a dedicated brainstorm (see handoff docs).

Rendering core (reviewed, high confidence):
- EnvCellRenderer SSBO stride fix: upload packed Matrix4x4[] (64B) instead of
  the 80B CPU InstanceData struct the shader never expected — fixes the
  transform/texture "explosion" for any draw with >1 instance (cells that
  dedupe to a shared cellGeomId). Real root cause.
- WB-style global FrontFace(CW) + per-batch CullMode carried through the MDI
  layout (GroupKey + BuildIndirectArrays + DrawIndirectRange split into
  same-cull runs with absolute uDrawIDOffset per run).
- EntitySet partitioning (IndoorPass / OutdoorScenery / LiveDynamic) +
  WorldEntity.BuildingShellAnchorCellId so building shells scope to their
  dat-derived building cell instead of rendering everywhere.
- RenderOutsideInAcdream (look into buildings from outside) +
  CollectVisiblePortalBuildings frustum cull of portal bounds.
- Sky-when-inside-building + per-cell audit probe + GL-state probe.

Streaming / perf (test-covered; not independently code-reviewed this session):
- Near/far priority queues so near work wins over far; PromoteToNear carries
  full landblock + mesh data; LandblockEntriesWithoutAnimatedIndex avoids
  rebuilding the animated-lookup dict in the hot draw path. Fixes the
  bridge-not-appearing / missing-walls / broken-collision-after-travel
  regressions and improves post-transition FPS.

Tooling + docs:
- tools/A8CellAudit: offline dat cell/portal/building dumper (portals +
  buildings modes) — reproduces the cellar-flap investigation with no launch.
- docs/research cellar-flap root-cause + option-2 handoff (the didInsideStencil
  double-duty finding + the WB-recursive design decision + brainstorm prompt),
  entity-taxonomy, replan, issue-78 visibility investigation.

Diagnostics retained on purpose: ACDREAM_A8_DIAG_* gates, portal_stencil.vert
provisional pos.w clamp, and the probe families are kept (env-var gated, zero
cost when off) because the pending option-2 cellar-flap brainstorm needs them.
Strip in the option-2 ship commit.

Indoor branch stays behind ACDREAM_A8_INDOOR_BRANCH=1 (default off = pre-A8
visual). Build green; App tests + Core (streaming/dispatcher/loader) tests pass.

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

tests/AcDream.Core.Tests/Rendering/Wb/LandblockSpawnAdapterTests.cs

@@ -101,8 +101,7 @@ public sealed class LandblockSpawnAdapterTests
     public void OnLandblockLoaded_SameLandblockTwice_DedupesAtTheLandblockLevel()
     {
         // If a landblock load fires twice (e.g. a streaming-controller bug),
-        // we should not double-register. Second load is treated as a no-op
-        // for ref-counting purposes.
+        // we should not double-register ids that were already seen.
         var captured = new CapturingAdapterMock();
         var adapter = new LandblockSpawnAdapter(captured);
 
@@ -118,6 +117,49 @@ public sealed class LandblockSpawnAdapterTests
         Assert.Single(captured.IncrementCalls);
     }
 
+    [Fact]
+    public void OnLandblockLoaded_FarEmptyThenNearPromotion_RegistersPromotedIds()
+    {
+        var captured = new CapturingAdapterMock();
+        var adapter = new LandblockSpawnAdapter(captured);
+
+        var far = MakeLandblock(
+            landblockId: 0x12340000u,
+            entities: System.Array.Empty<WorldEntity>());
+        var promoted = MakeLandblock(landblockId: 0x12340000u, entities: new[]
+        {
+            MakeAtlasEntity(id: 1, gfxObjIds: new[] { 0x01000010u, 0x01000020u }),
+        });
+
+        adapter.OnLandblockLoaded(far);
+        adapter.OnLandblockLoaded(promoted);
+
+        Assert.Equal(2, captured.IncrementCalls.Count);
+        Assert.Contains(0x01000010ul, captured.IncrementCalls);
+        Assert.Contains(0x01000020ul, captured.IncrementCalls);
+    }
+
+    [Fact]
+    public void OnLandblockLoaded_PromotionWithPartiallyRegisteredIds_RegistersOnlyNewIds()
+    {
+        var captured = new CapturingAdapterMock();
+        var adapter = new LandblockSpawnAdapter(captured);
+
+        var initial = MakeLandblock(landblockId: 0x12340000u, entities: new[]
+        {
+            MakeAtlasEntity(id: 1, gfxObjIds: new[] { 0x01000010u }),
+        });
+        var promoted = MakeLandblock(landblockId: 0x12340000u, entities: new[]
+        {
+            MakeAtlasEntity(id: 1, gfxObjIds: new[] { 0x01000010u, 0x01000020u }),
+        });
+
+        adapter.OnLandblockLoaded(initial);
+        adapter.OnLandblockLoaded(promoted);
+
+        Assert.Equal(new[] { 0x01000010ul, 0x01000020ul }, captured.IncrementCalls);
+    }
+
     // ── Test helpers ──────────────────────────────────────────────────────
 
     private sealed class CapturingAdapterMock : IWbMeshAdapter