The agent's SSH socket was only exported via the zsh integration, so a
GUI client launched outside a shell (rofi launcher, autostarted apps)
couldn't use gpg-agent for SSH. Add a home.sessionVariables export
resolving the socket with gpgconf --list-dirs agent-ssh-socket — the
same lookup the shell integration uses, so the two can't drift — which
reaches GUI apps via the login shell that starts Hyprland (the path
NIXOS_OZONE_WL already takes).
Eval-verified: the var resolves to the gpgconf substitution; the home
config still builds.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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