OptionalcredentialPer-candidate credential-availability already computed by
AIPromptRunner.selectModelWithAPIKeyTracked during selection, keyed by
driverClass:modelID:vendorId (the same key AIPromptRunner.executeModelWithFailover
uses for its own cache). Lets failover REUSE selection's credential probes instead of
recomputing HasCredentialsAvailable for the prefix it already walked.
Because selection short-circuits once the highest-priority credentialed candidate is found (see the DECISION note in AIPromptRunner.selectModelWithAPIKeyTracked), this map only contains the candidates UP TO AND INCLUDING the selected one. The not-evaluated tail is intentionally absent so failover still probes it lazily — only if it ever has to walk down there during an actual failover.
OptionalmodelOptionalpromptThe selected candidate's AIPromptModel PromptConfiguration, for the native tool-calling gate.
OptionalselectionOptionalvendorOptionalvendorOptionalvendor
Bundles the full output of selectModel so it can be threaded through ExecutePrompt → executeSinglePrompt / executePromptInParallel without discarding vendor-resolution data that would need to be re-derived.