implementer
345ceccfad
The environment adapter now resolves HOST through resolveHost, validating it at the adapter boundary as a hostname (RFC 1123) or IP address (IPv4/IPv6, node:net isIP); an invalid HOST throws a field-specific ConfigStartupError naming host, so arbitrary env content is never used for binding or echoed verbatim into the startup log (issue acceptance criterion, resolving security review finding SEC-3). The server passes config.host to server.listen(config.port, config.host, ...), so a configured HOST binds exactly that interface and the startup log never claims a bind the process does not enforce (resolving SEC-2).