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/RuntimeOptions.cs

@@ -38,6 +38,13 @@ public sealed record RuntimeOptions(
     int HidePartIndex,
     bool RetailCloseDegrades,
     bool DumpSceneryZ,
+    bool DumpLiveSpawns,
+    bool A8DiagDisableInsideStep4Terrain,
+    bool A8DiagDisableInsideStep4Outdoor,
+    bool A8DiagDisableInsideStep3EnvCellOpaque,
+    bool A8DiagDisableInsideStep3IndoorPass,
+    bool A8DiagDisableInsideStep2Punch,
+    bool A8DiagDisablePortalDepthClamp,
     int? LegacyStreamRadius)
 {
     /// <summary>
@@ -77,6 +84,19 @@ public sealed record RuntimeOptions(
             // only for before/after diagnostic comparisons.
             RetailCloseDegrades: !string.Equals(env("ACDREAM_RETAIL_CLOSE_DEGRADES"), "0", StringComparison.Ordinal),
             DumpSceneryZ:        IsExactlyOne(env("ACDREAM_DUMP_SCENERY_Z")),
+            DumpLiveSpawns:      IsExactlyOne(env("ACDREAM_DUMP_LIVE_SPAWNS")),
+            A8DiagDisableInsideStep4Terrain:
+                                  IsExactlyOne(env("ACDREAM_A8_DIAG_DISABLE_INSIDE_STEP4_TERRAIN")),
+            A8DiagDisableInsideStep4Outdoor:
+                                  IsExactlyOne(env("ACDREAM_A8_DIAG_DISABLE_INSIDE_STEP4_OUTDOOR")),
+            A8DiagDisableInsideStep3EnvCellOpaque:
+                                  IsExactlyOne(env("ACDREAM_A8_DIAG_DISABLE_INSIDE_STEP3_ENVCELL_OPAQUE")),
+            A8DiagDisableInsideStep3IndoorPass:
+                                  IsExactlyOne(env("ACDREAM_A8_DIAG_DISABLE_INSIDE_STEP3_INDOORPASS")),
+            A8DiagDisableInsideStep2Punch:
+                                  IsExactlyOne(env("ACDREAM_A8_DIAG_DISABLE_INSIDE_STEP2_PUNCH")),
+            A8DiagDisablePortalDepthClamp:
+                                  IsExactlyOne(env("ACDREAM_A8_DIAG_DISABLE_PORTAL_DEPTH_CLAMP")),
             // Legacy override for ACDREAM_STREAM_RADIUS. Caller applies it on
             // top of the quality preset's radii. Null when unset or invalid.
             LegacyStreamRadius:  TryParseNonNegativeInt(env("ACDREAM_STREAM_RADIUS")));