pagination

Fixing an N+1 API fan-out in commitcheck: one pagination pass replaces 250 requests, SSL timeout gone, runtime down to 27.5s.

TL;DR: The monitor hung for over 100 seconds because each candidate triggered full pagination, creating roughly 250 requests per run. Replacing per-candidate checks with a single paginated fetch into a commit-to-slug map removed the N+1 overhead. Runtime dropped to 27.5 seconds with only a few requests and no change to the API contract.