Enforce strict SINGLE=1 RX exclusivity, always filter inject-only downlink by
each peer's own OPTIONS, and push self-service DB options only after PASS=.
Stop merged SYSTEM static TG lists from leaking across hotspots in topology.
Add opt-in REPORTS.MQTT with retained shared state and live voice_event
topics, topology static TG in v2 payloads, dashboard_state builder, and
SIGHUP reload.
Rodrigo Pérez