Add MVP resource respawn rules

Docs/Terrain/GroundZeroResourcePass.md

@@ -41,6 +41,19 @@ The map now contains:
 These counts include the original demo wood and fiber nodes so the first player
 path remains intact while expanding the broader tile resource layer.
 
+## Respawn Rules
+
+MVP respawn rules separate renewable surface resources from nonrenewable stone:
+
+- Wood nodes respawn after `900` seconds once fully depleted.
+- Fiber nodes respawn after `600` seconds once fully depleted.
+- Edible plant nodes respawn after `1200` seconds once fully depleted.
+- Stone nodes do not respawn in the MVP.
+
+Respawn restores the node to its configured `MaxHarvests` value and re-enables
+visibility/collision through the same replicated depletion state used by
+gathering.
+
 ## Follow-Up
 
 Future passes should replace the prototype meshes with real coastal scrub,