New lib/review/stop-rule.mjs: classOf (catalogue key, else the lower-cased
dimension before the first slash, else unclassified), roundSummary
(blocking = blockers + counting majors; new = no carried_from; null map
for a round counted in full), decideStop (same-class / not-fewer on the
last pair, round 1 alone never fires) and describeStop (one operator line
with the class, the counts per round and the two recommendations).
Part 1, step 1.1 of the E plan.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
