It passed alone in two seconds and failed in a full suite run at six,
which is the worst way for a test to be wrong: the code was fine and the
report said otherwise.
Each of its waits polls until the compositor reflects a write, and four
seconds was enough on an idle machine and not enough on a busy one. They
are fifteen now. A longer bound cannot mask a dead write, because a
write that never lands never matches -- verified by stubbing the write
path out and watching it still report exactly which policy failed.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
Gabriel Brown
b10f8e2593