Serhii Dziupin
ddae6f2545
The env var was already read and passed to the managed OpenCode server spawn, but any non-empty string was accepted. Reject values that are not a valid IP (IPv4/IPv6, brackets allowed) or DNS-style hostname with a clear [config] error and fall back to the secure loopback default so a typo can never silently bind a non-loopback address. Refs OPE-231