The per-room in-memory history map is gone: a restart emptied it and /sync resumed from the
cursor, so every room (a DM first) lost its past. When a delivery is built the mouth now reads
the room's timeline from the homeserver as that Persona (GET /messages dir=b, or the thread's
root plus /relations m.thread for a threaded message), keeps m.room.message from everyone
including her own, oldest first, ending before the delivered event. Newest lines are kept to a
16 KiB byte budget (each clipped to limits.contextBytes), at most the 20 lines the delivery
tuple carries. One fetch per room or thread per sync round. A failed fetch gives empty context
and a redacted log line; the delivery still goes out.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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