Kept movement orders through temporary traffic

I stopped temporary unit traffic from throwing away a move destination after three retries. Units can wait for nearby traffic and continue toward the order they were given.

Harvester steering now receives simulation time so a temporary detour can expire. Focused checks include opposing infantry passing without overlap. This improves those traffic cases; it is not an exhaustive crowd or route-performance claim.

“A short blockage no longer discards the destination, and Harvester detours use simulation time.”