Three sibling gaps in the WebSocket transport's conversation lifecycle:
- #78429: _send_channel_subscription defaulted a zero last_ts to
'since ~ now', so the message that CREATED a new conversation (created_at
fractionally before the subscription) was never delivered. A channel with
no high-water mark now subscribes from the beginning with
limit=_FETCH_LIMIT instead; seeded channels still resume from last_ts-1.
- #93557: relays do not guarantee a kind-44100 membership event per new
conversation, so WS-transport deployments never discovered DMs opened
mid-session until a reconnect. The WS loop now runs the same
_discover_dms sweep the poll transport uses, on the same cadence
(poll_interval * _DM_DISCOVERY_EVERY), via a companion task that is
cancelled with the connection.
- #75107: _discover_dms only ever adopted DM-shaped conversations, so a
real community channel the agent joined mid-run was never subscribed
until restart. In watch-all mode (no explicit channels list) newly
listed real channels are now adopted and seeded from their newest events
(history predating the join is not replayed). Explicit watch lists stay
authoritative.
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