The kanban-worker skill taught kanban_complete with three full examples but
never mentioned the artifacts=[...] parameter added in #27813 — so a worker
reading the skill had no way to learn it can ship a chart/PDF/image as a
native upload to the subscriber's chat.
Adds a 'Shipping deliverables' section covering absolute-path rules, the
inline-vs-file extension behavior, and the trap that the notifier reads the
top-level artifacts list (NOT metadata.*).
37fa3c58b4