pub fn real_or_none(value: &str) -> Option<&str>Expand description
Treat the harness “unknown” placeholder and empty/whitespace strings
as absent so renderers don’t surface them as literal text. Mirrors
the discipline in snapshot::clean_attribution_value — the harness
writes “unknown” when it can’t identify provider/model from
argv/env, and rendering that literally as anthropic/unknown is
worse than just showing the meaningful side.