Update documentation for v2.9.0#271

Merged

igerber merged 6 commits intomainfrom

docs/v2.9.0-documentation-refresh

Apr 5, 2026

Commits on Apr 5, 2026

Update documentation for v2.9.0: add WooldridgeDiD, refresh roadmap and survey docs

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Address AI review: qualify survey claims, fix API drift and examples

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Address AI review round 2: fix remaining survey claim inconsistencies

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Address AI review round 3: choosing_estimator survey exclusion, DDD split

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Address AI review round 4: add DDD flowchart branch, fix denominators

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Address AI review round 5: OLS vs ASF distinction, DDD tree ordering

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