Don't-batch-YouTube-requests rule, filed from modulair-wiki ingest session
where ~21 rapid requests tripped HTTP 429 IP-block on both transcript-api and
yt-dlp. Captures empirical symptom + cooldown/one-at-a-time fix + en-US lang
gotcha, to land in SKILL.md as a What-NOT-to-do bullet + failure-mode row.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>