[Feat] (trace-replay): add Create flywheel indirect and instancing fixtures

Two 1.21.1 NeoForge Create in-world captures facing water wheels and a
large cogwheel, one per flywheel backend (/flywheel backend indirect and
instanced). The indirect trace exercises the compute scatter/cull
pipeline, glMultiDrawElementsIndirect with GPU-written commands, and
draw-parameter emulation; captured with persistent-map shadowing so the
unflushed scatter descriptors Flywheel writes are recorded. Both trimmed
to a single frame and brotli-repacked (~7 MiB each).

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

tools/trace_replay/README.md

@@ -103,6 +103,13 @@ The bundled fixtures cover:
 - minecraft-1.21.4-fabric-iris-sundial-lite-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
   Sundial Lite after entering a singleplayer world.
   ![Minecraft 1.21.4 Fabric Iris Sundial Lite in-world golden](fixtures/minecraft-1.21.4-fabric-iris-sundial-lite-in-world.0000150023.png)
+- minecraft-1.21.1-neoforge-create-indirect-in-world: captured from Minecraft 1.21.1 NeoForge with Create, Sodium,
+  and Iris (no shader pack) in a world facing Create water wheels and a large cogwheel, with Flywheel's
+  `flywheel:indirect` backend (compute-shader culling, glMultiDrawElementsIndirect, persistent-mapped staging).
+  ![Minecraft 1.21.1 NeoForge Create indirect in-world golden](fixtures/minecraft-1.21.1-neoforge-create-indirect-in-world.0000504631.png)
+- minecraft-1.21.1-neoforge-create-instancing-in-world: same world and camera as the indirect case, with Flywheel's
+  `flywheel:instancing` backend (texture-buffer instance data, glDrawElementsInstancedBaseVertex).
+  ![Minecraft 1.21.1 NeoForge Create instancing in-world golden](fixtures/minecraft-1.21.1-neoforge-create-instancing-in-world.0000530333.png)
 
 Build from the MobileGL repository root:
 

tools/trace_replay/trace_cases.json

@@ -257,6 +257,20 @@
       "golden": "minecraft-1.21.4-fabric-iris-derivative-main-d24.4.14-in-world.0000145353.png",
       "alternate_golden": "minecraft-1.21.4-fabric-iris-derivative-main-d24.4.14-in-world.0000145353-android-angle.png",
       "target_call": 145353
+    },
+    {
+      "name": "minecraft-1.21.1-neoforge-create-indirect-in-world",
+      "trace_archive": "minecraft-1.21.1-neoforge-create-indirect-in-world.tgz",
+      "golden": "minecraft-1.21.1-neoforge-create-indirect-in-world.0000504631.png",
+      "target_call": 504631,
+      "timeout_seconds": 1800
+    },
+    {
+      "name": "minecraft-1.21.1-neoforge-create-instancing-in-world",
+      "trace_archive": "minecraft-1.21.1-neoforge-create-instancing-in-world.tgz",
+      "golden": "minecraft-1.21.1-neoforge-create-instancing-in-world.0000530333.png",
+      "target_call": 530333,
+      "timeout_seconds": 1800
     }
   ]
 }