feat(v4): post-fit results.aggregate() contract + CallawaySantAnna (Phase 2b PR 1) - #728

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feat/v4-aggregate-contract-cs

Jul 26, 2026

Commits on Jul 25, 2026

feat(v4): aggregation contract module + pure CS event-study aggregator
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feat(v4): results.aggregate() on CallawaySantAnna + fit(aggregate=) shim
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feat(v4): ledger rows M-117/M-122, contract tests, CS guidance migration
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Commits on Jul 26, 2026

fix(v4): correct aggregate() df provenance, container normalization, stale guidance
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docs: track the downstream EventStudyResults adapter work (honest_did, pretrends, plot_event_study)
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fix(v4): stop retaining raw unit ids, refuse to relabel stored intervals
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fix(v4): enforce the shared n_kind vocabulary on both containers
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fix(v4): label RCS counts as obs, document the fit-time deprecation
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docs(v4): enumerate every retained buffer in the aggregation memory accounting
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fix(v4): clear group df provenance on bootstrap, fix mypy, document aggregate()
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docs: fix a guide example that violates the contract it documents; SDDD provenance regression
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