pub fn prepare_strict_input(input_path: &Path) -> Result<Option<Prepared>>Expand description
If input_path is strict (per-file marker or project-level opt-in), lower
the whole source tree into the cache and return the new root path +
a --remap-path-prefix flag.
Returns Ok(None) for non-strict sources — the caller should pass the
original args through to the underlying tool unchanged.