Constant DEFAULT_BIND_ADDR 

pub const DEFAULT_BIND_ADDR: &str = "127.0.0.1:8787";

Default address bhtune-server binds to when nothing else specifies one – loopback only, matching the “v1 binds to 127.0.0.1 by default” decision in AGENTS.md. Lives alongside DEFAULT_BRIDGE_HOST in this shared config module (rather than in bhtune-server itself) even though only the server binary ever calls resolve_bind_addr, the same way templates/log below are settings only some commands consume – one bhtune.toml file and one precedence chain for every bhtune setting, CLI or server.