Checkpoint: pre-realignment working tree (Gym->GymSub repoint + SyntyWorld/PostFX re-enable, SampleScene removed, PostFX_Daylight retune, ai.assistant pkg re-added)

Baseline before the LANTERN realignment & purge (plan: one look, four scenes,
Bathynaut on the player). Gym.unity edits are operator-made in-editor.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Packages/packages-lock.json

@@ -15,7 +15,7 @@
         "com.unity.nuget.newtonsoft-json": "3.0.2",
         "com.unity.test-framework": "1.1.31"
       },
-      "hash": "11836003a5e2ffcb7715ecec7e1fbb9d9cdb5bb8"
+      "hash": "c14de1e6dc01ab42d2bb358730cff954bce0ce6b"
     },
     "com.rukhanka.animation": {
       "version": "file:com.rukhanka.animation",
@@ -39,6 +39,26 @@
       "source": "embedded",
       "dependencies": {}
     },
+    "com.unity.2d.sprite": {
+      "version": "1.0.0",
+      "depth": 1,
+      "source": "builtin",
+      "dependencies": {}
+    },
+    "com.unity.ai.assistant": {
+      "version": "2.14.0-pre.1",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.2d.sprite": "1.0.0",
+        "com.unity.mathematics": "1.3.2",
+        "com.unity.nuget.mono-cecil": "1.11.5",
+        "com.unity.modules.uielements": "1.0.0",
+        "com.unity.nuget.newtonsoft-json": "3.2.1",
+        "com.unity.modules.unitywebrequest": "1.0.0"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.ai.inference": {
       "version": "2.6.1",
       "depth": 0,