Overview

Adds an additional "message" argument to history.comment, mostly for transcripts, and so I can test history comment sync in share transcripts.

Adds a transcript that uses it.

Implementation approach and notes

• Adds an additional "message" argument to the history.comment command
• If provided, skip opening the message buffer and make the comment with that message
• Fixes the help message for how to refer to branches, even though I don't really like the /main: syntax.
• Added a text argument parser

Test coverage

• new transcript