Replace template meshes with native placeholders

Docs/TemplateVariantDecision.md

@@ -21,9 +21,9 @@ Keep temporarily:
 - `ThirdPerson` compatibility assets only while references are audited. The
   active player, controller, and game mode Blueprint paths now live under
   `/Game/Agrarian/Blueprints/Characters`.
-- `LevelPrototyping` meshes needed by current setup scripts and prototype
-  Blueprints until the version 0.1 environment pass replaces them with
-  Agrarian-native placeholder meshes.
+- Source `LevelPrototyping` meshes may remain only as copy sources for
+  repeatable setup scripts. Active setup outputs now use Agrarian-native
+  placeholder mesh assets under `/Game/Agrarian/Environment/PlaceholderMeshes`.
 - Shared mannequin/animation content only where current Agrarian assets still
   reference it.
 
@@ -48,8 +48,8 @@ Cleanup performed:
 4. Disabled `StateTree` and `GameplayStateTree` in `AgrarianGame.uproject`.
 5. Replaced the current `ThirdPerson` player/game mode paths with Agrarian-owned
    player, controller, and game mode Blueprint assets.
-6. Kept the current `LevelPrototyping` mesh path until the Ground Zero
-   environment pass replaces the simple cube/cylinder placeholder dependencies.
+6. Replaced the active `LevelPrototyping` cube/cylinder placeholder dependencies
+   with Agrarian-native placeholder mesh assets.
 
 ## Current State
 
@@ -60,6 +60,7 @@ version `0.01` project-structure completion:
 - `ThirdPerson` active player/game mode paths have been replaced. Remaining
   ThirdPerson compatibility assets should be deleted only after redirector and
   editor reference checks confirm they are unused.
-- `LevelPrototyping` stays because current Agrarian setup scripts and prototype
-  Blueprints still use its simple cube/cylinder meshes. This is now tracked as
-  version `0.1` environment replacement work.
+- Active setup scripts, prototype Blueprints, and the Ground Zero map now use
+  Agrarian-native placeholder mesh assets. `LevelPrototyping` can be removed
+  after later reference audits confirm no editor-only copy-source path is still
+  needed.