The deliverable check used to compare a run against knowledge entries,
documents, and substantial task comments only, so a research or content
task that produced its output as a markdown file on disk (via
write/edit/bash) stayed pinned in_progress even though the deliverable
was already sitting in `work_products`.
Split the DB query into `collectRunDeliverableSignals`, which returns
the four surfaces (knowledge / document / work product / substantial
comment) explicitly, and push the per-task-type acceptance logic into
`automation-run-completion`. Each task type declares which signal set
counts as a valid deliverable: content tasks now require a document or
an on-disk artifact and will not advance on a knowledge entry alone;
research and general accept any of the four; code and management
preserve their broader surface. Tests updated to cover the new signal
and the content/knowledge rejection case.