Closes the loop on docker-based repro: builds a real Elixir Mix release
(with :ssl included) containing one GenServer registered as
Elixir.Wallet.Bridge, runs it under TLS dist with the production
inet_tls.conf shape, hits it from erldistpy.Node.call.
Passes cleanly with erldistpy 0.1.7. So the production portal failure
('peer closed after 0/4 bytes' against portal@unsandbox.com) isn't
reproducible in isolation, even with every dimension matched (Mix
release, OTP 25, TLS dist with permissive verify_fun + tls1.2/1.3 +
secure_renegotiate, Elixir GenServer, long FQDN node names).
The bug must be in interaction with portal's other dist connections or
its larger supervisor tree — beyond what we can repro without standing
up the full portal app locally.
