spectrum-ts 12.x delivers a threaded (swipe) reply as
{type: 'reply', content, target}. The sidecar had no branch for it, so
the agent received '[Photon content type not handled: reply]' and the
message text was lost.
- sidecar: normalize 'reply' to its inner content plus the target's id,
direction and text
- adapter: unwrap it and set reply_to_message_id / reply_to_text /
reply_to_is_own_message on the MessageEvent
- adapter: record outbound text (send, attachments, standalone send) in
gateway.rich_sent_store and use it when spectrum can't hydrate the
quoted text, which is the usual case for our own bubbles. DM GUIDs
and bare E.164 share one key.
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