Upgrade: Unity 6.4.7 -> 6.5.0 (DOTS stack onto unified 6.5)

Editor 6000.4.7f1 -> 6000.5.0f1. DOTS packages leave their independent
1.x/2.x lines for unified 6.5.0 versioning: netcode 1.13.2 -> 6.5.0,
physics 1.4.6 -> 6.5.0, transport 2.7.2 -> 6.5.0, entities/collections/
graphics 6.4.0 -> 6.5.0, mathematics 1.3.3 -> 1.4.0 (burst stays 1.8.29).
URP/ShaderGraph/VFX 17.4 -> 17.5, ugui 2.0 -> 2.5, test-framework 1.6 -> 1.7.
charactercontroller 1.4.2 + local rukhanka 2.9.0 unchanged (resolve on 6.5
via SemVer floor). Includes the URP global-settings + VFX/MPPM/package-manager
ProjectSettings migrations 6.5 wrote on first open.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

ProjectSettings/PackageManagerSettings.asset

@@ -19,24 +19,26 @@ MonoBehaviour:
   m_DismissPreviewPackagesInUse: 0
   oneTimeWarningShown: 0
   oneTimePackageErrorsPopUpShown: 0
-  m_Registries:
-  - m_Id: main
+  m_MainRegistry:
+    m_Id: main
     m_Name: 
     m_Url: https://packages.unity.com
     m_Scopes: []
     m_IsDefault: 1
+    m_IsUnityRegistry: 1
     m_Capabilities: 7
     m_ConfigSource: 0
     m_Compliance:
       m_Status: 0
       m_Violations: []
+  m_ScopedRegistries: []
   m_UserSelectedRegistryName: 
   m_UserAddingNewScopedRegistry: 0
   m_RegistryInfoDraft:
     m_Modified: 0
     m_ErrorMessage: 
     m_UserModificationsEntityId:
-      m_Data: -930
+      m_rawData: 568105589213756514
     m_OriginalEntityId:
-      m_Data: -932
+      m_rawData: 568105589213756512
   m_LoadAssets: 0