Keyset-rotation-aware proof selection. Wraps selectProofsRGLI.
Prefers stale keysets (base64 first, then older versions, inactive before active), force-including whole stale buckets, dust and all, so balances rotate onto the current keyset. Falls back to plain RGLI when the biased attempt has no solution.
Keyset-rotation-aware proof selection. Wraps selectProofsRGLI.