a3c9499e93
A new enabled source is armed for run-until-done backfill (#693) but would sit idle until the next scheduler tick (~60s). create_source now enqueues the first walk right away (pending DownloadEvent + download_source.delay), skipping only when the platform is in a rate-limit cooldown (the scheduler picks it up when that clears). Disabled sources still don't dispatch. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>