PLUTO-700 follow-up: live confirmation the retired 10-arg fn_insertSupportTicket shape stays unused - one authenticated browser /soporte submit against the shipped build, then db-pluto-cc reads pg_stat_statements (11-arg queryid rises, 10-arg does not)

Split from PLUTO-700 closure per audit-pluto-ca (mt46pt1ufbn5): migration/cutover correctness did not depend on this; it is live confirmation only. Needs a human or proxy browser session (proxy-pluto wake gap). Unexercised, not failed.