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>

src/AcDream.App/Streaming/GpuWorldState.cs

@@ -137,21 +137,55 @@ public sealed class GpuWorldState
     public IEnumerable<(uint LandblockId, Vector3 AabbMin, Vector3 AabbMax,
                         IReadOnlyList<WorldEntity> Entities,
                         IReadOnlyDictionary<uint, WorldEntity>? AnimatedById)> LandblockEntries
+        => EnumerateLandblockEntries(includeAnimatedIndex: true);
+
+    /// <summary>
+    /// Per-landblock render entries without the animated lookup dictionary.
+    /// Static render passes use this to avoid rebuilding an index they cannot
+    /// consume.
+    /// </summary>
+    public IEnumerable<(uint LandblockId, Vector3 AabbMin, Vector3 AabbMax,
+                        IReadOnlyList<WorldEntity> Entities,
+                        IReadOnlyDictionary<uint, WorldEntity>? AnimatedById)> LandblockEntriesWithoutAnimatedIndex
+        => EnumerateLandblockEntries(includeAnimatedIndex: false);
+
+    /// <summary>
+    /// Lightweight bounds-only enumeration for overlays and diagnostics.
+    /// Does not walk entity lists.
+    /// </summary>
+    public IEnumerable<(uint LandblockId, Vector3 AabbMin, Vector3 AabbMax)> LandblockBounds
     {
         get
         {
             foreach (var kvp in _loaded)
             {
-                // Build AnimatedById on the fly — cheap (~132 entities/LB max).
-                var byId = new Dictionary<uint, WorldEntity>(kvp.Value.Entities.Count);
+                if (_aabbs.TryGetValue(kvp.Key, out var aabb))
+                    yield return (kvp.Key, aabb.Min, aabb.Max);
+                else
+                    yield return (kvp.Key, Vector3.Zero, Vector3.Zero);
+            }
+        }
+    }
+
+    private IEnumerable<(uint LandblockId, Vector3 AabbMin, Vector3 AabbMax,
+                         IReadOnlyList<WorldEntity> Entities,
+                         IReadOnlyDictionary<uint, WorldEntity>? AnimatedById)> EnumerateLandblockEntries(
+        bool includeAnimatedIndex)
+    {
+        foreach (var kvp in _loaded)
+        {
+            Dictionary<uint, WorldEntity>? byId = null;
+            if (includeAnimatedIndex)
+            {
+                byId = new Dictionary<uint, WorldEntity>(kvp.Value.Entities.Count);
                 foreach (var e in kvp.Value.Entities)
                     byId[e.Id] = e;
-
-                if (_aabbs.TryGetValue(kvp.Key, out var aabb))
-                    yield return (kvp.Key, aabb.Min, aabb.Max, kvp.Value.Entities, byId);
-                else
-                    yield return (kvp.Key, Vector3.Zero, Vector3.Zero, kvp.Value.Entities, byId);
             }
+
+            if (_aabbs.TryGetValue(kvp.Key, out var aabb))
+                yield return (kvp.Key, aabb.Min, aabb.Max, kvp.Value.Entities, byId);
+            else
+                yield return (kvp.Key, Vector3.Zero, Vector3.Zero, kvp.Value.Entities, byId);
         }
     }