Update system-chat, remove syntax example, change USER/ASSISTANT to…

Update system-chat, remove syntax example, change USER/ASSISTANT to PLAYER/ENTITY, simplify FLEE and PROTECT behaviors.
4 jobs from flee-crash in 3 minutes 31 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #39227
minecraft
build_mod

02:04

 
  Test
passed #39228
minecraft allowed to fail manual
gpt-3.5-turbo

00:40

passed #39229
minecraft allowed to fail manual
gpt-4o

00:46

manual #39230
minecraft allowed to fail manual
llama3-8b