Sub-ticket of PLUTO-116 Real-time error tee: appEvents AFTER-INSERT pg_notify trigger on Pluto Supabase (error→PM DM, warn stays in digest). GATED on nw-venus's exact spec (channel name, WHEN-clause, payload — byte-identical channel+payload across 3 apps; host listener LISTENs + DMs PM). Pluto level vocab = error|warn|info (NO fatal) so WHEN-clause = level='error'. Pre-apply audit review per DDL discipline. Additive/reversible. Do NOT start until spec lands + 112 done. · pluto