The three collab:link events were broadcast and landed nowhere: the links
panel held its own list and never listened, so a link somebody else added
showed up on the next reload. It listens now, the same shape the notes panel
uses, and the events are classified in the client's WS policy, which is the
ratchet that caught this.
Four e2e harnesses build their own trip_files and one asserts the collab
feature set, so the new message_id column and the new links flag had to reach
them too. Two MCP unit tests pinned the old four-key feature object.
Maurice
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