Give the backfill task a default 15-minute interval trigger. With the
rate-limit cooldown floor each run meets a fresh ready-set, a saturated
batch trips the zero-progress breaker, and an empty lane exits in
milliseconds, so the backlog drains at provider speed unattended. The
canary claim cap and batch delay keep their semantics, and operators can
retune or disable the trigger through the admin task UI.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
