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Transport.post(text, thread=...) returns the event ID, which can root a thread; a threaded post carries m.thread with the reply fallback for clients without threads. Inbound messages carry their event ID and thread root: a message in a thread gives its root, a plain reply joins the thread of the message it replies to when known, and the quoted lines of a rich reply are no longer part of the text. The in-memory transport plays threads for tests. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPQ14L3LikyefCMFBqEbKE