Christopher-soapbox wanted Slack threads to stop spawning duplicate Mike chats

For a Slack bridge, one thread should map to one legal-AI conversation. Christopher-soapbox's proposed change would have allowed an integration to supply its own stable reference when starting a chat.

If the same person and reference appeared again, Mike would return the existing conversation rather than open another one. A new reference would create a fresh chat, while ordinary chat creation would continue unchanged. That is a small but practical piece of integration plumbing: the outside platform keeps using the identifier it already understands.

The pull request included checks for repeat, new and ordinary chat requests, but it was closed before merger.