2.18.0-beta.22 — /restart restarts Docksentry again

One regression from beta.20, found while mapping the dispatcher.

Fixed

• /restart restarts Docksentry again. The lifecycle branch matches /restart without requiring a space after it, so once bare /stop and /restart were routed there to answer with a usage line instead of silence (beta.20), it swallowed the bare form as well — and the branch that restarts Docksentry itself sat below it, unreachable. /restart answered "usage: /restart " and restarted nothing.

  It is tested for first now, on an exact match, so /restart <name> and /restartx go exactly where they went before. The restore flow's restart button and Discord's /restart were never affected.

  2.17.1 is unaffected — only beta.20 and beta.21 carry this. If you are on :beta, this is worth picking up.

Everything from 2.18.0-beta.20 and beta.21 is in here unchanged.