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a94ba2a7e0
A PrivateV1 conversation is an out-of-band X3DH intro that binds no sender credential, so its messages carry an empty credential. The client's `decode_sender` returns `Missing` for an empty credential, and the event emitters dropped any message whose sender could not be decoded. A PrivateV1 conversation therefore surfaced `ConversationStarted` but never the message content, for both the initial message and every reply. Deliver these messages with no sender instead of dropping them: - `Event::MessageReceived.sender` becomes `Option<MessageSender>`; `None` marks an anonymous PrivateV1 message. - `ConvoOutcome` carries the conversation `class` (mirroring `InboxOutcome`), so the client can tell a legitimately credential-less PrivateV1 message from a group message that is missing one. - A new `message_sender` helper gates the anonymous case on `class == Private`; a missing credential on any group class is still dropped, preserving the invariant that group messages must be attributable. Covered by a new `private_v1_integration` test exercising both the inbox (initial message) and convo (reply) receive paths.