Thread-only mode previously relied on the global conversationMode to
determine whether threads got separate conversations. In shared or
per-channel mode, all threads shared one conversation causing crosstalk.
Add forcePerChat flag on InboundMessage that the Discord adapter sets
when thread-only mode is active. resolveConversationKey treats flagged
messages as per-chat regardless of the configured mode, giving each
thread its own isolated conversation while still sharing agent memory.
Written by Cameron ◯ Letta Code
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