GET /prompt_manager/jobs/{id}/report returns the summary, counters, every
outcome group's listed rows with truncated flags, the scope and the log as a
JSON attachment (prompt-manager-<kind>-<YYYYMMDD-HHMM>.json), with no absolute
paths. The job view's Download report saves it through the api-client URL, and
the scan log opens at its newest line and follows new lines only while the
reader is at the bottom.