create_rudp_schema_transport and CultMesh.create_rudp_client (and create_client
and connect_client above them) defaulted bind_host to 127.0.0.1 on an AF_INET
socket. On Windows a socket bound to loopback cannot send off the host (os
error 10051), so a default client could not reach a remote endpoint.
cultnet-py now owns the rule in rudp_client_bind_host: loopback for a loopback
endpoint, otherwise the unspecified address of the endpoint's family (0.0.0.0
or ::). bind_host defaults to None on the client paths, which use the rule; the
socket family follows the bind host. An explicit bind_host still wins; a
CultMesh server still binds 127.0.0.1 unless told otherwise.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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