Expose observed two-criterion electional exclusion interactions

Evaluates the selected predicates once on a fixed 15, 30, or 60 minute UTC grid of at most seven days, then projects every unordered pair omission without recalculating charts. Exact witnesses identify samples admitted only after both named criteria are omitted. This is sampled leave-two-rules-out evidence, not causal attribution, continuous-time proof, weighting, ranking, recommendation, interpretation, prediction, or statistical confidence. Unavailable samples are explicit and break runs. No licensed catalog, new dependency, or request-time network source is used. One standard quota unit per admitted request; failed or timed-out admitted attempts are not refunded. Do not automatically retry. Historical mode uses an explicit BCE/CE date object and UT1 conventions. Its response is the versioned historical envelope, not the modern UTC envelope. Read result for calculation fields and metadata for limits and uncertainty.