sacc_io converters: SACC → CosmoSIS 2pt-FITS (byte-verified) + SACC ↔ OneCovariance#249

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cailmdaley wants to merge 21 commits into

feat/sacc-3-2pt-converter

Commits on Jul 16, 2026

feat(sacc_io): SACC read/write for the standard data-product layout

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fix(sacc_io): enforce ascending grids; readers in insertion order

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One SACC file per catalogue version: fine xi rides as grid='fine' points

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Word fine-block covariance source tool-agnostically (OneCovariance go-forward)

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feat(sacc_io): type=data|mock stamp with fail-closed load; merge + update_statistic

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Address review: rename grid values to reporting/integration; clarify comments

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Simplify sacc_io writers/readers and test builders

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fix(sacc_io): fail loud on unmatched selections; merge/update guards

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feat: SACC → 2pt-FITS converter + OneCovariance file-format glue

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Commits on Jul 19, 2026

refactor: merge twopoint_convert + one_covariance_io into sacc_interop

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Commits on Jul 20, 2026

refactor: fold sacc_interop into sacc_io — one SACC module

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Commits on Jul 21, 2026