port 2V2-d.2: Granny runtime on libgr2, main character model animates

Implement the Granny SDK 2.11 API the client uses on top of libgr2
(platform/EterGrnLib/GrannyRuntime.cpp, shim granny.h declared from the
SDK header): file sections, type-definition vertex conversion, material
textures by Usage, mesh/bone bindings, deformer, control clock/loop/ease
and weighted SRT sampling. Port EterGrnLib (LODController, Material, Mesh,
Model, ModelInstance*, Motion, Thing, ThingInstance, Util) plus EterLib
GrpObjectInstance/GrpCollisionObject/CollisionData verbatim and drop their
platform skeletons and pending stand-ins; register the gr2 resource
factory; vertex/index buffers are CPU-side until the 2V2-e render adapter.

app.UpdateGame/RenderGame now run 40250's bodies, reaching the
CPythonApplication members through their singletons (the platform has no
app object); CPythonGraphic joins GameSingletons in member order, and
GetMousePosition reads the host cursor.

port.login_flow asserts the main instance's PART_MAIN model has meshes,
its diffuse image loaded and the WAIT motion moves the bones between
frames; offline and live pass, port_gate macos PASS.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

audit/port-map/EterGrnLib/ModelInstanceCollisionDetection.cpp.json

@@ -0,0 +1,32 @@
+{
+  "reference": "EterGrnLib/ModelInstanceCollisionDetection.cpp",
+  "reference_sha256": "3ac1f5d7252505c75f74d8a656290a4a1ab2d8fbd06b806f0801fcc36ec29a66",
+  "priority": "P4",
+  "contracts": [],
+  "functions": {
+    "CGrannyModelInstance::MakeBoundBox": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/EterGrnLib/ModelInstanceCollisionDetection.cpp:CGrannyModelInstance::MakeBoundBox"
+      ]
+    },
+    "CGrannyModelInstance::Intersect": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/EterGrnLib/ModelInstanceCollisionDetection.cpp:CGrannyModelInstance::Intersect"
+      ]
+    },
+    "CGrannyModelInstance::GetBoundBox": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/EterGrnLib/ModelInstanceCollisionDetection.cpp:CGrannyModelInstance::GetBoundBox"
+      ]
+    },
+    "CGrannyModelInstance::GetMeshMatrixPointer": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/EterGrnLib/ModelInstanceCollisionDetection.cpp:CGrannyModelInstance::GetMeshMatrixPointer"
+      ]
+    }
+  }
+}