Add edible plant resource nodes

Docs/Terrain/GroundZeroResourcePass.md

@@ -8,6 +8,8 @@ height, slope, and drainage-candidate analysis.
 
 - Wood: scrub/woodland and hillside patches.
 - Fiber: grassland, scrub, and drainage-candidate areas.
+- Edible plants: coastal scrub, grassland, and drainage-candidate forage
+  patches that yield the MVP `food` item.
 - Stone: slope, exposed terrain, and valley-edge areas.
 
 Freshwater remains separate because the water-source roadmap item follows this
@@ -16,6 +18,8 @@ pass and should be implemented as its own gameplay actor/system.
 ## Implementation
 
 - Added `BP_StoneResourceNode` through `Scripts/setup_playable_blueprints.py`.
+- Added `BP_EdiblePlantResourceNode` through
+  `Scripts/setup_playable_blueprints.py`.
 - Updated `Scripts/setup_ground_zero_demo_map.py` to place deterministic Ground
   Zero resource nodes.
 - Added `Scripts/verify_ground_zero_resources.py` to validate node presence,
@@ -27,6 +31,7 @@ The map now contains:
 
 - Wood nodes: `4`
 - Fiber nodes: `5`
+- Edible plant nodes: `3`
 - Stone nodes: `4`
 
 These counts include the original demo wood and fiber nodes so the first player