Digest sends read one channelFetchLimit page and then stamped
last_digest_at, permanently dropping overflow rows from combined-mode
recaps and slipping digest-only overflow by a day per page. Digest legs
now page listSince until the window is empty before stamping; renderers
already cap displayed items, so large drains stay deliverable.
Per-episode sends keep single-page reads — their watermark-advance
semantics were already correct.
Also re-check the channel's enabled() under the claim lock so flipping
the admin kill switch stops an in-flight pass immediately instead of
after it completes; the existing errChannelUnavailable path aborts the
pass without penalizing the recipient.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
