keep a session's given name when its workspace changes

the workspace route put the session's own copy of its info back into the registry, and that copy still has the title the session started with. a renamed root then went back to its old title in the workspace reply and as the sender name on its children's task letters. remember now re-reads the stored row, which has the new workspace, the given name, and the latest title, and answers with it.

e46d8fb1 parent 87bc7a8e +24 −9
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