M1: player stand + control handoff + Cinemachine camera system

- Install Cinemachine 3.1.7
- Stand (raised platform behind north wall) with StandPoint_0/_1
- PlayerAvatar: seat-ownership drives the mode — hold a seat => teleport to your
  stand, freeze, refuse input (control transfers/locks to your tread); release =>
  teleport back, resume on-foot. Resolves the WASD overlap off one flag.
- CameraDirector on Main Camera: 4 Cinemachine vcams (AvatarFollow / RobotFollow
  / StandView / CinematicOrbit), Brain blends; V cycles; default auto-follows the
  seat flag (on-foot=Avatar, driving=Robot). Retires the old FollowCamera.
- Verified in play: claim->teleport+freeze+RobotFollow, release->return+AvatarFollow

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

Packages/packages-lock.json

@@ -36,6 +36,16 @@
       },
       "url": "https://packages.unity.com"
     },
+    "com.unity.cinemachine": {
+      "version": "3.1.7",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.splines": "2.0.0",
+        "com.unity.modules.imgui": "1.0.0"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.collab-proxy": {
       "version": "2.12.4",
       "depth": 0,
@@ -242,6 +252,13 @@
       },
       "url": "https://packages.unity.com"
     },
+    "com.unity.settings-manager": {
+      "version": "2.1.1",
+      "depth": 2,
+      "source": "registry",
+      "dependencies": {},
+      "url": "https://packages.unity.com"
+    },
     "com.unity.shadergraph": {
       "version": "17.5.0",
       "depth": 1,
@@ -251,6 +268,17 @@
         "com.unity.searcher": "4.9.3"
       }
     },
+    "com.unity.splines": {
+      "version": "2.9.0",
+      "depth": 1,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.mathematics": "1.2.1",
+        "com.unity.modules.imgui": "1.0.0",
+        "com.unity.settings-manager": "1.0.3"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.test-framework": {
       "version": "1.7.0",
       "depth": 0,