Get Weight Salt

Per-epoch base standings for the weight setter (ORO-1704).

epoch_standings is the epoch-pinned base vector input: the validator builds its base vector from it so all honest validators in the epoch stay byte-identical. None means it couldn't be resolved this tick (e.g. chain unreadable); the validator retains its last-good weights.

active / eligible / weight_overlay are deprecated — the ORO-1649 watermark decoy-overlay was removed. They are retained (empty / False) only for response-shape compatibility with older clients and will be dropped in a coordinated SDK + validator release.