The agent cannot sudo (password required), so nginx deploy is a user step.
go-services/nginx/go-location.conf holds the `location /go/` block + the
`upstream tracker_go` line with apply instructions. Not required for the
parallel run (the Go service is parity-verified on loopback); this is for
browser-reachable /go/ access. Live overlord.conf has drifted from the repo
copy — reconcile by hand, don't cp-overwrite.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>