v0.18.50

v0.18.50

• The benchmark harness no longer runs background compaction on the clusters it
  spawns, and refuses to load a data bucket that contains compaction residue
  (compacted_* objects) from an earlier run — a benchmark harness must never
  mutate the bucket it reads. This prevents the silent row-duplication that made
  one SF10 fixture hold three copies of its data. Set
  WADJET_HARNESS_ALLOW_COMPACTED=1 to load a dataset whose canonical files are
  deliberately compaction-produced.
• A new correctness gate covers a two-key GROUP BY ... SUM under an OUTER join
  whose result feeds a predicate on the sum, on the single-process engine and
  three distributed configurations with the aggregate's spill drain forced,
  including probe rows that match no group — those must come back NULL and must
  not satisfy the predicate.