Real Electron + real serve backend + mock inference: the Desktop holds alpha's Bot Chat open,
a chmod-000 ticket is planted in alpha's bot_live_delivery mailbox, then a real DM is admitted
through tools.bot_live_delivery. Fails on the pre-fix backend (admission degrades to
PermissionError / ambiguous, the gateway poll crashes every cycle, nothing renders); passes
with the tolerant scan (the DM renders as an inter-agent card).
Part of #109820