Function generate_diagnostics 

pub async fn generate_diagnostics<R: Registry + ?Sized>(
    parse_result: &dyn ParseResult,
    registry: &R,
    formatter: &dyn EcosystemFormatter,
) -> Vec<Diagnostic>

Generates diagnostics by fetching from registry (makes network calls).

Warning: This function makes network requests for each dependency. Prefer generate_diagnostics_from_cache when cached versions are available.