docs: report the current differential sweep coverage - #57
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The README quoted 35,000 comparisons across seven seeds. The sweep now stands at ten seeds × 5,000 queries — 50,000 comparisons, roughly 15,000 of them joins.
Also states why the join share is asserted rather than assumed: an earlier generator only queried a single table, so the hash join sat outside the oracle entirely. The assertion has teeth — disabling join generation makes the differential test fail with
only 0/300 generated queries joined.