Resolves partial tuning options into a complete ResolvedTuning, layering opts over an optional base and finally over the module defaults.
opts
base
Highest-priority overrides (for example per-send SendOptions).
Fallback values applied when opts omits a field (for example manager-level defaults).
A ResolvedTuning with every field populated.
Resolves partial tuning options into a complete ResolvedTuning, layering
optsover an optionalbaseand finally over the module defaults.