Development record

TestMarkingAFloodShownFitsThePrompt in internal/core/claim fails on a loaded machine: at a load average of 15 to 20 the read and marking of 300 announcements took 281 to 536 ms, past its 500 ms bound or the prompt's deadline. It fails the same way on an untouched copy of origin/main at 998883ef0, so it is a wall-clock bound that depends on the machine's load, not a defect the code under test introduced.