deploy.sh: fix LLM unit relink (unquote source path so ${unit} expands on the remote)

The relink loop wrapped the source path in single quotes, which shipped a
literal ${unit} to the remote and created a dangling symlink
(/etc/systemd/system/frank-default-large.service -> .../${unit}.service),
so 'systemctl enable' failed with 'unit does not exist'. The path has no
spaces; unquoting lets ${unit} expand on the remote for both source and
destination.

scripts/deploy.sh

@@ -219,7 +219,10 @@ fi
 
 echo '[4/5] Relinking LLM units and restarting LLM services...'
 for unit in ${LLM_UNITS[$TARGET]}; do
-  ${SUDO} ln -sf '${REMOTE_DIR[$TARGET]}/scripts/\${unit}.service' /etc/systemd/system/\${unit}.service
+  # No quotes around the path: ${unit} must expand on the remote (the path
+  # has no spaces). Quoting it would ship a literal ${unit} and create a
+  # dangling symlink (2026-08-22 bug).
+  ${SUDO} ln -sf ${REMOTE_DIR[$TARGET]}/scripts/\${unit}.service /etc/systemd/system/\${unit}.service
 done
 ${SUDO} systemctl daemon-reload
 for svc in ${LLM_SERVICES[$TARGET]}; do