Discord channel-history backfill partitions on Hermes' last self-authored
message. Asynchronous, non-conversational status sends (self-improvement
review bubbles, heartbeats, background-process notifications, update status,
gateway restart/online notices) land as ordinary bot messages, so a delayed
status bump becomes the history boundary and swallows real messages that
arrived after Hermes' actual reply.
Mark these sends at the source via metadata["non_conversational"] (Discord
only; other platforms' metadata is unchanged). The adapter no longer advances
the history-boundary cache for marked sends and persists their IDs to a
sidecar JSON so the cold-start scan can skip them by ID after a restart. A
narrow regex recognizer remains only as an upgrade bridge for status bumps
emitted by an older gateway that pre-dates the marking.
caaa916289