2026-08-31 — itd-185's payload item is FLAT (`pattern` plus the position's own

2026-08-31 — itd-185's payload item is FLAT (pattern plus the position's own body fields, read from issueschema.ReadingBodyFields), not spc-63's drafted {pattern_named, body} with shortened names. Ground: the four shipped definitions instruct the flat shape and the record schema's field names, so the drafted table would have refused every output the shipped instrument can produce and would have put a rename between the payload and the record for no gain. Rejected: keeping the spec's table and translating at ingest.