ci(arxiv-digest): earlier cron for reliable pre-wake UK delivery - #66
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…delivery GitHub cron only jitters later (0-3h), so 06:00 UTC could slip to ~10:00 BST — after UK scientists have started their day. arXiv announces at 20:00 ET (~01:00 UK), so papers are ready overnight; run at 02:00 UTC (03:00 BST nominal, worst-case ~06:00 BST) so the digest is waiting in #papers before morning coffee. Comment updated to match. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Why
The daily strong-lensing #papers digest was scheduled
0 6 * * 1-5(06:00 UTC). GitHub Actions cron only ever jitters later (0–3 h under load), never earlier, so on a congested morning it could slip to ~10:00 BST — after UK scientists have already started their day. (This morning, 2026-07-13, its first-ever scheduled weekday, the sibling morning workflows landed 08:09–10:12, confirming the delay.)Fact-check on arXiv timing
arXiv announces new astro-ph at 20:00 US Eastern, Sun–Thu (availability docs) = ~01:00 UK (00:00 UTC summer / 01:00 UTC winter). So papers are live in the small hours — there is no "just after arXiv, in the morning" window; the papers are ready ~6 h before wake-up. The job just needs to deliver into #papers before the user is up.
Change
0 6 * * 1-5→0 2 * * 1-5(02:00 UTC = 03:00 BST / 02:00 GMT nominal; worst-case +3 h jitter ≈ 05:00–06:00 BST). Digest is waiting over morning coffee, ~2 h after the overnight announcement. Timing comment updated to match. No behaviour change beyond the schedule; Mon–Fri cadence and the Monday 72 h weekend look-back are unchanged.Note: a fixed exact delivery time is not achievable with GitHub cron — this sets the nominal early enough that the worst case still lands pre-wake.
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