The delivery core makes max_retries attempts in total: a fresh delivery
starts at attempt one and gives up once the attempt number reaches
max_retries, so 3 is three attempts, not four, and 0 is special-cased to
a single fire-and-forget attempt with no retries and no circuit breaker.
The create and edit target forms called it "Max retries" with no total,
and the README data-model row called it "maximum retry attempts", so an
operator wanting "try, then retry twice" would enter the wrong number.
Both forms and the README rows now state the number is the total number
of delivery attempts, with the 0 case spelled out. The delivery
arithmetic is unchanged. A UI copy test renders both forms and pins the
shared wording so it cannot drift back to a retry count.
Model: opus-4-8
sneak