Suppress a warning, reporting why the save failed when it does.
Same write as suppress_warning. The distinct causes matter because they
have different fixes: a malformed [warnings] section is one line of TOML
the user can correct, while telling them to check file permissions -- the
only advice a bare False supports -- sends them to chmod a file that
was never unwritable.
Warning identifier to suppress (e.g., 'ripgrep').
Path to config file.
Defaults to ~/.deepagents/config.toml.
