Function explain_stored 

pub fn explain_stored(
    profile: Option<&InferenceProfile>,
    model_defaults: Option<&InferenceConfig>,
    global_defaults: Option<&InferenceConfig>,
    model_ctx: ModelSamplingContext,
    caps: &Option<TemplateCaps>,
) -> (InferenceConfig, FieldSources, Option<SuppressedEffort>)

Resolve stored sampling for one model, and report where each value came from and whether the template gate silently dropped an effort level.

The request rung is deliberately empty: this explains configuration, not a call, so there are no per-request parameters to occupy the top of the ladder.