The routes' annotations now list every 400 reason (including the JSON
shape rejections), the 503 causes, the 31-minute running window, the
404 after a controller restart, and that an errored row reads
not-applicable with certainty 0 and an empty reason, so the page keys
off error, and that overall can be approve beside errored rows.
swarm-queue-client gains review_classifier: the try-out subject, the
request and reply that travel on it, and the deadlines both ends share.
The controller's reader grant may publish the subject; a client named
with --review-classifier-client may subscribe to it and its inbox, and
answers under NATS allow_responses (resp in the user JWT) within the
run deadline. Every other client id is still denied.
