Document resource depletion persistence

AGRARIAN_DEVELOPMENT_ROADMAP.md

@@ -751,7 +751,10 @@ Target deliverable: A small group can join a server, spawn into one biome, gathe
   and restore through `RestoreSavedItems`, so inventory listeners and derived
   carry weight refresh after load.
 - [x] Save placed structures.
-- [ ] Save resource depletion state if needed.
+- [x] Save resource depletion state if needed. Active loaded resource nodes
+  persist stable `ResourceNodeId`, remaining harvest count, and MVP respawn
+  flag through `FAgrarianSavedResourceNode`, then restore depletion to matching
+  map-authored nodes on load.
 - [ ] Save world time.
 - [ ] Save weather seed/state.
 - [ ] Save containers.

Docs/PersistenceDesignDocument.md

@@ -485,6 +485,11 @@ restore only matching existing nodes. This deliberately avoids spawning resource
 nodes from saves, keeping tile-authored resources owned by tile content while
 letting persistence remember depletion for active tiles.
 
+Resource depletion is stored in `FAgrarianSavedResourceNode` records with stable
+`ResourceNodeId`, remaining harvest count, and the MVP respawn flag. The
+persistence subsystem captures active loaded resource nodes during world save
+and applies depletion only to matching map-authored nodes during load.
+
 ## Open Questions
 
 - Should the first playable MVP use `USaveGame`, JSON, or a hybrid save

Scripts/verify_resource_node_persistence.py

@@ -46,12 +46,19 @@ EXPECTED = {
         "Resource node persistence is map/tile state",
         "captures only resource nodes that exist in the",
     ],
+    ROOT / "Docs" / "PersistenceDesignDocument.md": [
+        "`FAgrarianSavedResourceNode`",
+        "`ResourceNodeId`, remaining harvest count, and the MVP respawn flag",
+        "matching map-authored nodes during load",
+    ],
     ROOT / "Docs" / "Terrain" / "GroundZeroResourcePass.md": [
         "Ground Zero resource actors receive stable `PersistenceNodeId` values",
         "resource nodes that exist in the loaded world",
     ],
     ROOT / "AGRARIAN_DEVELOPMENT_ROADMAP.md": [
         "[x] Add resource node persistence.",
+        "[x] Save resource depletion state if needed.",
+        "`FAgrarianSavedResourceNode`",
     ],
 }