docs(security): remove SSH username/host specifics from public docs

CLAUDE.md

@@ -5,7 +5,7 @@ Cloud-native multi-tenant notes application built on Notesium (MIT).
 ## Project
 
 - Repo: https://git.librete.ch/public/librenotes
-- Remote: `ssh://tengo@git.librete.ch:41240/public/librenotes.git`
+- Remote: `ssh://git.librete.ch:41240/public/librenotes.git` (configure SSH user in `~/.ssh/config`)
 - Stack: Go backend (forked from Notesium), vanilla JS frontend
 - License: MIT (inherited from Notesium)