Add merge preview endpoint to Preview spec#581

Merged

marcmlc merged 7 commits into

mainfrom

marc/merge-preview-spec

Jul 13, 2026

Commits on Jul 9, 2026

Make from and into required on merge_preview_request

marcmlc
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claude
committed
Split conversation reassignments into owned and participated in merge preview

marcmlc
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claude
committed
Report a single distinct conversations count in merge preview

marcmlc
and
claude
committed