Add wildlife spawn manager

Docs/TechnicalDesignDocument.md

@@ -542,6 +542,14 @@ tile has no nav data, wildlife falls back to direct movement input so damage,
 flee, chase, and harvest loops remain functional while map navigation is being
 authored.
 
+### Wildlife Spawning
+
+`AAgrarianWildlifeSpawnManager` owns MVP wildlife population seeding on the
+server. Designers can assign a wildlife class, initial count, max active count,
+spawn radius, and respawn interval. Spawn points optionally project to navigation
+before spawning so the first wildlife prototype favors reachable positions while
+still falling back cleanly on maps without complete nav data.
+
 ### JSON Metadata
 
 Use JSON files for external terrain/tile pipeline metadata while the pipeline is