port 2V2-c: chrmgr/chr modules + race registration chain

PythonCharacterManagerModule/PythonCharacterModule ported verbatim; the
2V0 chr/chrmgr stubs are gone and initchr/initchrmgr run in 40250 order.
The registration chain they need (RaceData/RaceDataFile/RaceManager/
RaceMotionData, GameType, AttributeData/AttributeInstance, TextFileLoader,
Util, Camera/CameraProcedure) is ported; CRaceManager is created in
PythonBoot. port.login_flow asserts race 0 has its wait motions and no
unhandled packet header; port.login_live 8/8 against 192.168.21.203.

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

audit/port-map/UserInterface/CameraProcedure.cpp.json

@@ -0,0 +1,26 @@
+{
+  "reference": "UserInterface/CameraProcedure.cpp",
+  "reference_sha256": "b3c676fbf1e637181b53ae8de7631e5fafd9a7a39b5e98261d11dee0d5364312",
+  "priority": "P4",
+  "contracts": [],
+  "functions": {
+    "CCamera::ProcessTerrainCollision": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/UserInterface/CameraProcedure.cpp:CCamera::ProcessTerrainCollision"
+      ]
+    },
+    "CCamera::ProcessBuildingCollision": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/UserInterface/CameraProcedure.cpp:CCamera::ProcessBuildingCollision"
+      ]
+    },
+    "CCamera::Update": {
+      "status": "PORTED",
+      "impl": [
+        "extension/src/port/UserInterface/CameraProcedure.cpp:CCamera::Update"
+      ]
+    }
+  }
+}