Clean up net cull deprecation warnings

AGRARIAN_DEVELOPMENT_ROADMAP.md

@@ -865,9 +865,14 @@ Target deliverable: A small group can join a server, spawn into one biome, gathe
 - [x] Can reconnect and retain state. Added a reconnect state-retention QA gate tied to logout/restart player snapshots, safe player identity, transform, survival, care history, inventory restore, normal-spawn fallback behavior, and the two-client manual reconnect evidence path.
 - [x] Can restart server and retain placed shelter. Added a server-restart shelter persistence QA gate tied to `primitive_shelter` persistent actor state, world actor save/load, game-mode class registration, load-on-server-start behavior, shelter weather protection, and a release smoke requirement to place, save, restart, and confirm the shelter transform remains.
 - [x] No critical log spam during 30-minute test. Added a 30-minute critical log soak QA gate plus `scan_critical_log_spam.py` so client/server/release logs can be checked for fatal, crash, assertion, ensure, access-violation, callstack, and critical-error spam before a milestone package is treated as investor-stable.
-- [ ] Clean up Unreal API deprecation warnings from packaged builds, starting
+- [x] Clean up Unreal API deprecation warnings from packaged builds, starting
   with direct `NetCullDistanceSquared` access on replicated world actors before
-  future Unreal upgrades turn the warning into a compile blocker.
+  future Unreal upgrades turn the warning into a compile blocker. Replaced direct
+  `NetCullDistanceSquared = FMath::Square(...)` assignments with
+  `SetNetCullDistanceSquared(FMath::Square(...))` on item pickups, resource
+  nodes, campfires, shelters, wildlife, water sources, weather exposure zones,
+  and wildlife spawn managers, then added verifier coverage to prevent the
+  deprecated assignment style from returning.
 - [ ] Server remains stable with target test player count.
 
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