A redemption (or insertion) hint went stale, recompute and retry. NOTE (ground-truth
ยง11): not distinctly reachable from the SDK surface, a stale redemption partial hint
surfaces as RedemptionFailed ("Unable to redeem any amount"); insertion hints
never revert. Retained as stable public API (shipped Phase 6).
A redemption (or insertion) hint went stale, recompute and retry. NOTE (ground-truth ยง11): not distinctly reachable from the SDK surface, a stale redemption partial hint surfaces as RedemptionFailed ("Unable to redeem any amount"); insertion hints never revert. Retained as stable public API (shipped Phase 6).