SshConfig no longer has proxyPassword or totpSecret fields, so neither
can sit in clear in nexus.db or travel in an export. The proxy password
is a SecretKind (profile:<id>:proxy-password) edited like other saved
credentials and purged with the profile; the session manager hands both
it and the TOTP seed to the SSH client from the keychain/vault at
connect time.
This drops compatibility with Go-era profiles and .link/.nexus files
that carry these values inline: they are ignored on read and must be
re-entered (SEC-20261012-011).
Andy Dixon
672c71e26f