The daemon does not call join_room_by_id. It fires a wake and writes
to mcp-loose-ends/matrix.json; the agent calls list_invites + join_room.
Replace the inaccurate 'Auto-accept invites' paragraph with 'Invite
wakes' describing the actual flow. Merge the pending-invites paragraph
into a single accurate block.
The matrix wake body description said '[matrix] <sender> in <room>:
<first-100c>...' (old single-line teaser). After feat(#1137) it's now
a richer format:
- Single room, 1 message: terse one-liner with sender + body
- Single room, N messages: count + room name
- Multi-room: bulleted list with per-room summaries
Also note that the same breakdown appears in get_loose_ends via the
UnreadMatrix entry.
