Builds on @wgu9's runtime-tracking fix: now that find_gateway_pids() can
see a no-supervisor `gateway restart` runtime, have stop_profile_gateway()
fall back to an orphan-aware, profile-scoped reap (SIGTERM then SIGKILL)
when the pidfile/runtime record is missing or stale. Closes the duplicate-
accumulation path in #51325 — a follow-up restart now kills the prior
orphan instead of stacking another listener on :8644. Gated on
not supports_systemd_services() so a transient `gateway restart` argv on
supervised hosts is never killed.
Also adds the AUTHOR_MAP entry for the salvaged contributor.
3d56807fbd