Add MVP resource respawn rules

Docs/TechnicalDesignDocument.md

@@ -438,6 +438,16 @@ authority. This keeps drinking compatible with the existing replicated survival
 component while leaving later container filling, water quality, and source
 depletion rules for future water-system work.
 
+For the MVP, renewable MVP resource nodes respawn only after they are fully
+depleted. Wood, fiber, and edible plant nodes are renewable because they
+represent surface materials and forage that should return during continued
+prototype play. Stone remains nonrespawning because it represents a slower
+geologic resource and should push players to explore once local easy stone is
+gone. Respawn timing is configurable per Blueprint through
+`bRespawnsForMvp`, `RespawnDelaySeconds`, and `MaxHarvests`; the native node
+uses a server-side timer and restores replicated `RemainingHarvests` when the
+delay expires.
+
 ### Wildlife Navigation
 
 MVP wildlife movement is server authoritative. `AAgrarianWildlifeBase` uses an