Document stone resource support

AGRARIAN_DEVELOPMENT_ROADMAP.md

@@ -529,7 +529,9 @@ Target deliverable: A small group can join a server, spawn into one biome, gathe
 
 - [x] Create resource node base class.
 - [x] Add wood resource.
-- [ ] Add stone resource.
+- [x] Add stone resource. Stone is defined as `DA_Item_Stone`, exposed through
+  `BP_StoneResourceNode`, placed in the Ground Zero resource pass, and covered
+  by focused stone-resource verification.
 - [x] Add fiber resource.
 - [ ] Add edible plant resource.
 - [ ] Add water gathering interaction.

Docs/TechnicalDesignDocument.md

@@ -415,6 +415,18 @@ Use Unreal Data Assets for designer-facing definitions such as:
 
 Data Assets should describe content. Server code should enforce gameplay rules.
 
+### Gatherable Resources
+
+The 0.1.F resource baseline uses `AAgrarianResourceNode` for simple gatherable
+world resources. Wood, fiber, and stone each have item definitions, resource
+Blueprints, deterministic Ground Zero placements, replicated remaining harvest
+counts, and bare-hand gathering through the shared interaction path.
+
+Stone specifically is represented by `DA_Item_Stone` and
+`BP_StoneResourceNode`. Ground Zero includes stone nodes in slope, exposed
+terrain, and valley-edge positions so primitive tools, campfires, and early
+construction recipes have an in-world source instead of relying on debug grants.
+
 ### Wildlife Navigation
 
 MVP wildlife movement is server authoritative. `AAgrarianWildlifeBase` uses an

Scripts/verify_stone_resource.py

@@ -0,0 +1,83 @@
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+FILES = {
+    "setup_item_definitions.py": ROOT / "Scripts" / "setup_item_definitions.py",
+    "setup_playable_blueprints.py": ROOT / "Scripts" / "setup_playable_blueprints.py",
+    "setup_ground_zero_demo_map.py": ROOT / "Scripts" / "setup_ground_zero_demo_map.py",
+    "verify_playable_blueprints.py": ROOT / "Scripts" / "verify_playable_blueprints.py",
+    "verify_ground_zero_resources.py": ROOT / "Scripts" / "verify_ground_zero_resources.py",
+    "GroundZeroResourcePass.md": ROOT / "Docs" / "Terrain" / "GroundZeroResourcePass.md",
+    "TechnicalDesignDocument.md": ROOT / "Docs" / "TechnicalDesignDocument.md",
+    "AGRARIAN_DEVELOPMENT_ROADMAP.md": ROOT / "AGRARIAN_DEVELOPMENT_ROADMAP.md",
+}
+
+EXPECTED = {
+    "setup_item_definitions.py": [
+        '"asset": "DA_Item_Stone"',
+        '"item_id": "stone"',
+        "Field stone suitable for crude tools",
+        '"unit_weight": 1.5',
+    ],
+    "setup_playable_blueprints.py": [
+        'STONE_ITEM_PATH = "/Game/Agrarian/DataAssets/Items/DA_Item_Stone"',
+        '"asset": "BP_StoneResourceNode"',
+        '"yield_item_definition": STONE_ITEM_PATH',
+        '"remaining_harvests": 12',
+        '"quantity_per_harvest": 2',
+    ],
+    "setup_ground_zero_demo_map.py": [
+        '"/Game/Agrarian/Blueprints/Resources/BP_StoneResourceNode"',
+        '"AGR_GZ_Stone_Slope_01"',
+        '"AGR_GZ_Stone_Slope_02"',
+        '"AGR_GZ_Stone_ExposedTerrain_03"',
+        '"AGR_GZ_Stone_ValleyEdge_04"',
+    ],
+    "verify_playable_blueprints.py": [
+        '"/Game/Agrarian/Blueprints/Resources/BP_StoneResourceNode"',
+        '"yield_item_id": "stone"',
+    ],
+    "verify_ground_zero_resources.py": [
+        '"stone": [',
+        '"AGR_GZ_Stone_Slope_01"',
+        'f"{len(EXPECTED_RESOURCE_LABELS[\'stone\'])} stone nodes."',
+    ],
+    "GroundZeroResourcePass.md": [
+        "- Stone: slope, exposed terrain, and valley-edge areas.",
+        "Added `BP_StoneResourceNode`",
+        "Stone nodes: `4`",
+    ],
+    "TechnicalDesignDocument.md": [
+        "### Gatherable Resources",
+        "`AAgrarianResourceNode`",
+        "`DA_Item_Stone`",
+        "`BP_StoneResourceNode`",
+        "primitive tools, campfires, and early",
+        "construction recipes",
+    ],
+    "AGRARIAN_DEVELOPMENT_ROADMAP.md": [
+        "[x] Add stone resource.",
+        "`DA_Item_Stone`",
+        "`BP_StoneResourceNode`",
+        "Ground Zero resource pass",
+    ],
+}
+
+
+def main():
+    missing = []
+    for label, path in FILES.items():
+        text = path.read_text(encoding="utf-8")
+        for snippet in EXPECTED[label]:
+            if snippet not in text:
+                missing.append(f"{label}: {snippet}")
+
+    if missing:
+        raise RuntimeError("Stone resource verification failed: " + "; ".join(missing))
+
+    print("Agrarian stone resource verification complete.")
+
+
+if __name__ == "__main__":
+    main()