Move project to Unity 6.5.1 (editor patch)

ProjectVersion 6000.5.0f1 -> 6000.5.1f1; package re-resolve on the patch
(cinemachine 3.1.6->3.1.7, probuilder 6.0.9->6.1.2 + transitive bumps in
packages-lock). Core DOTS/Netcode stack unchanged (entities/netcode/
physics 6.5.0, URP 17.5.0). CLAUDE.md stack line updated to match.
Validated: clean compile, 390/390 EditMode tests, clean netcode boot.

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

Packages/manifest.json

@@ -5,7 +5,7 @@
     "com.unity.ai.inference": "2.6.1",
     "com.unity.ai.navigation": "2.0.13",
     "com.unity.charactercontroller": "1.4.2",
-    "com.unity.cinemachine": "3.1.6",
+    "com.unity.cinemachine": "3.1.7",
     "com.unity.collab-proxy": "2.12.4",
     "com.unity.entities": "6.5.0",
     "com.unity.entities.graphics": "6.5.0",
@@ -17,7 +17,7 @@
     "com.unity.multiplayer.tools": "2.2.8",
     "com.unity.netcode": "6.5.0",
     "com.unity.physics": "6.5.0",
-    "com.unity.probuilder": "6.0.9",
+    "com.unity.probuilder": "6.1.2",
     "com.unity.render-pipelines.universal": "17.5.0",
     "com.unity.services.multiplayer": "2.1.3",
     "com.unity.shadergraph": "17.5.0",