integrating @clehner suggestion

Signed-off-by: Dave Huseby <dave@cryptid.tech>

work_items/cbb_service_protocol.md

@@ -38,6 +38,7 @@ systems that have algorithm agility and are agnostic to the cryptography used.
 - [Tor Control Protocol][2]
 - [IETF RFC5321 Simple Mail Transport Protocol][3]
 - [Git Cryptography Protocol Proposal][4]
+- [SSH Agent Protocol][5]
 
 ## Meetings
 - Implementor updates are presented at the regular Applied Crypto WG meetings.
@@ -47,3 +48,4 @@ systems that have algorithm agility and are agnostic to the cryptography used.
 [2]: https://gitweb.torproject.org/torspec.git/tree/control-spec.txt
 [3]: https://datatracker.ietf.org/doc/html/rfc5321
 [4]: https://github.com/TrustFrame/git-cryptography-protocol/blob/main/Git%20Cryptography%20Protocol.md
+[5]: https://datatracker.ietf.org/doc/html/draft-miller-ssh-agent-04