The project keeps derived claims from rotting with freshness pins. A pin is a row that cites another file and records the hash of the bytes it was derived from. A small device recomputes those hashes and re-keys the rows. If a pin cannot be reproduced, the check that depends on it goes red instead of quietly lying. It went red. The cause was not the pin it named. One bad row, 29 failing tests verdict-check, before the fix tests 59 total, 30 passed, 29 failed OK_READ...