Function run_monolithic 

pub fn run_monolithic(
    workspace: &WorkspaceInfo,
    command: &str,
    crate_name: &str,
    extra_args: &[String],
    force_run: bool,
) -> Result<String>

Run the monolithic binary directly (fast path) or build+run (slow path).

If force_run is true, the staleness check is skipped and the runner is always rebuilt.