[refactor] Pulled TestingNote-specific logic out of Ticket for syncing comments (4m)
[refactor] Pulled TicketCommitter out of Ticket (1m)
[refactor] Dropped `close_ticket!` as an alias for `close!` (1m)
[skip] Tightened up Ticket (1m)
[refactor] Broke down the long `commits_must_exist_in_repo` method (3m)