strncpy does not null-terminate when the source fills the destination.
A PlatformIO environment name of 40 or more characters leaves pio_env
unterminated, nanopb aborts the whole MyInfo encode with 'unterminated
string', getFromRadio() returns 0 bytes forever, and the client app never
receives any config after want_config_id.
Clients that receive a redacted MyInfo (pio_env cleared before encode) are
unaffected, which makes the failure look client-specific when it is not.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
