Remove unused Post Processing Stack dependency (#7086)

docs/URP_MIGRATION_PLAN.md

@@ -10,8 +10,8 @@ Universal Render Pipeline (URP). This project is still on BiRP:
 - `ProjectSettings/GraphicsSettings.asset` has no custom render pipeline asset.
 - Every quality level in `ProjectSettings/QualitySettings.asset` has no custom render
   pipeline asset.
-- `Packages/manifest.json` still includes `com.unity.postprocessing`, the legacy
-  Post Processing Stack v2 package.
+- Legacy Post Processing Stack v2 has been removed from `Packages/manifest.json`;
+  keep verifying it stays out with the migration inventory.
 
 That means we should treat URP as a compatibility project, not a cosmetic cleanup.
 The goal is to migrate on our schedule, with visual baselines and small de-risking
@@ -82,23 +82,17 @@ generate the current report. The tool writes markdown and CSV files under
 
 ### 3. Verify Legacy Post Processing Usage
 
-The project still depends on `com.unity.postprocessing: 3.5.4`. Current search results
-show `PPP_Orc.asset` and scene template references, but not obvious production scene
-usage.
+The project no longer depends on `com.unity.postprocessing`. The old references were
+limited to an unused Orc/Ogre sample scene profile and scene-template type metadata,
+not production scenes.
 
-Immediate deliverable: determine whether Post Processing Stack v2 is actually used
-in production scenes.
+Immediate deliverable: keep the project free of Post Processing Stack v2 references
+and use the inventory report to catch regressions.
 
-If it is unused:
-
-- remove `com.unity.postprocessing`
-- remove unused profiles/resources/templates
-- verify Unity opens cleanly
-
-If it is used:
+If references reappear:
 
 - document the exact scene/camera/profile usage
-- plan the equivalent URP Volume settings
+- either remove the stale dependency or plan the equivalent URP Volume settings
 
 This is a good small PR because it either deletes a risky dependency now or precisely
 scopes the later migration work.

src/main/csharp/net/eagle0/clients/unity/eagle0/Packages/manifest.json

@@ -15,7 +15,6 @@
     "com.unity.inputsystem": "1.19.0",
     "com.unity.multiplayer.center": "1.0.1",
     "com.unity.nuget.newtonsoft-json": "3.2.2",
-    "com.unity.postprocessing": "3.5.4",
     "com.unity.test-framework": "1.6.0",
     "com.unity.timeline": "1.8.12",
     "com.unity.ugui": "2.0.0",

src/main/csharp/net/eagle0/clients/unity/eagle0/Packages/packages-lock.json

@@ -187,16 +187,6 @@
       "dependencies": {},
       "url": "https://packages.unity.com"
     },
-    "com.unity.postprocessing": {
-      "version": "3.5.4",
-      "depth": 0,
-      "source": "registry",
-      "dependencies": {
-        "com.unity.modules.imgui": "1.0.0",
-        "com.unity.modules.physics": "1.0.0"
-      },
-      "url": "https://packages.unity.com"
-    },
     "com.unity.profiling.core": {
       "version": "1.0.3",
       "depth": 1,

src/main/csharp/net/eagle0/clients/unity/eagle0/ProjectSettings/SceneTemplateSettings.json

@@ -71,16 +71,6 @@
             "type": "UnityEngine.PhysicsMaterial2D",
             "defaultInstantiationMode": 0
         },
-        {
-            "userAdded": false,
-            "type": "UnityEngine.Rendering.PostProcessing.PostProcessProfile",
-            "defaultInstantiationMode": 0
-        },
-        {
-            "userAdded": false,
-            "type": "UnityEngine.Rendering.PostProcessing.PostProcessResources",
-            "defaultInstantiationMode": 0
-        },
         {
             "userAdded": false,
             "type": "UnityEngine.Rendering.VolumeProfile",
@@ -123,4 +113,4 @@
         "defaultInstantiationMode": 1
     },
     "newSceneOverride": 0
-}
+}