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/StreamingController.cs

@@ -103,16 +103,16 @@ public sealed class StreamingController
         {
             _region = new StreamingRegion(observerCx, observerCy, NearRadius, FarRadius);
             var bootstrap = _region.ComputeFirstTickDiff();
-            foreach (var id in bootstrap.ToLoadFar)  _enqueueLoad(id, LandblockStreamJobKind.LoadFar);
             foreach (var id in bootstrap.ToLoadNear) _enqueueLoad(id, LandblockStreamJobKind.LoadNear);
+            foreach (var id in bootstrap.ToLoadFar)  _enqueueLoad(id, LandblockStreamJobKind.LoadFar);
             _region.MarkResidentFromBootstrap();
         }
         else if (_region.CenterX != observerCx || _region.CenterY != observerCy)
         {
             var diff = _region.RecenterTo(observerCx, observerCy);
-            foreach (var id in diff.ToLoadFar)  _enqueueLoad(id, LandblockStreamJobKind.LoadFar);
-            foreach (var id in diff.ToLoadNear) _enqueueLoad(id, LandblockStreamJobKind.LoadNear);
             foreach (var id in diff.ToPromote)  _enqueueLoad(id, LandblockStreamJobKind.PromoteToNear);
+            foreach (var id in diff.ToLoadNear) _enqueueLoad(id, LandblockStreamJobKind.LoadNear);
+            foreach (var id in diff.ToLoadFar)  _enqueueLoad(id, LandblockStreamJobKind.LoadFar);
             foreach (var id in diff.ToDemote)   _state.RemoveEntitiesFromLandblock(id);
             foreach (var id in diff.ToUnload)   _enqueueUnload(id);
         }
@@ -129,6 +129,7 @@ public sealed class StreamingController
                     _state.AddLandblock(loaded.Landblock);
                     break;
                 case LandblockStreamResult.Promoted promoted:
+                    _applyTerrain(promoted.Landblock, promoted.MeshData);
                     _state.AddEntitiesToExistingLandblock(promoted.LandblockId, promoted.Entities);
                     break;
                 case LandblockStreamResult.Unloaded unloaded: