Rewrite TripleDifference to match R's triplediff::ddd()#169

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igerber merged 7 commits intomainfrom

method-review-triple-d

Feb 19, 2026

Commits on Feb 19, 2026

Address PR #169 review round 3: PS fallback hessian and r_squared consistency

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Address PR #169 review round 4: non-finite IF propagation and docstring fix

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Address PR #169 review round 5: validate cluster column in TripleDifference

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