Demo file truncated

write a start script for AI vs AI. add
```
[modoptions]
{
MaxSpeed = 1000;
MinSpeed = 1000;
}
```
use spring-headless to play.
see the log, AI fight each other until one's commander get killed.

demo file recorded in such headless mode, when replay it, things stop updating after a few minutes(like 2 or 3 minutes game time).

Start by reproducing the issue with the described AI-vs-AI setup using spring-headless and the supplied modoptions. Inspect the generated log and replay behavior around the point, after roughly 2–3 minutes of game time, when updates stop. Done means the demo continues updating through the match until one commander is killed, or the failure is documented with a narrowed cause.

Written by the indexing model from the issue text.