Replies on WhatsApp Cloud arrived at the agent with reply_to_id set but
reply_to_text=None, so run.py never injected the "[Replying to: ...]"
disambiguation prefix (it gates on reply_to_text). Meta's webhook context
object carries only the quoted message's id, never its text.
Index (chat_id, wamid) -> text in rich_sent_store on every inbound message
and every outbound text send -- the same store that solved the identical
Telegram rich-send problem -- then look up the quoted text in
_build_message_event_from_cloud and populate reply_to_text plus
reply_to_is_own_message, derived from context.from versus the business
number.