Use repository Git remotes and SSH config

docs/ssh-transport-audit.md

@@ -85,8 +85,9 @@ host/key interaction design.
 
 ## Deliberate OpenSSH differences
 
-IronStorage does not read arbitrary OpenSSH configuration, `ProxyCommand`,
-`Match`, URL rewrites, separate push URLs, host certificates, password or
+IronStorage reads the connection-only `Host`, `HostName`, `User`, `Port`, and
+`IdentityFile` directives from OpenSSH configuration. It does not support
+`ProxyCommand`, `Match`, URL rewrites, separate push URLs, host certificates, password or
 keyboard-interactive authentication, agent forwarding, arbitrary remote
 commands, local transport helpers, or local-path remotes. These are explicit
 security boundaries, not partial implementations. HTTPS smart Git remains the