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chore: release
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test: a forward-mode oracle, a cost bound and a SQL-text fuzz; what they found (M4 10)
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test: mutation testing for the v2 soak, and the blind spots it found (M4 9)
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test: ties, NULLs, extreme values and big tables in the v2 soak (M4 7)
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feat(ddx-ad): relations as dims and values; the forward pass read (M3 5)
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test: aim the soak at today's changes; a cost benchmark; three findings (M4 11)
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feat(ddxdb): grad in SQL from Python, checked against jax.grad (M4 4)
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test(ddx-ad): contraction fixtures, written as plain SQL (M3 7)
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test: a simulation soak for query-level AD, and three bugs it found (M4 5)
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