Function resolve_target 

pub fn resolve_target(
    candidates: &[ResolveCandidate<'_>],
    model_type: &str,
    hidden_size: usize,
    model_refs: &[&str],
) -> Result<Option<usize>, TargetResolveError>

Resolve which candidate serves (model_type, hidden_size) for a checkpoint identified by model_refs. Returns the index of the winning candidate, Ok(None) when nothing declares the pair at all, and TargetResolveError::Ambiguous when a collision cannot be broken to exactly one target name.