docs: add upstream sync process documentation#1524

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timsaucer wants to merge 9 commits intoapache:mainfrom

timsaucer:feat/update-sync-process-documentation

Commits on May 3, 2026

docs: add upstream sync process documentation

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docs: add audit-skill-md skill

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docs: verify upstream sync completed before release

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docs: scope upstream sync cargo update to datafusion family

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docs: correct datafusion-* pin location in upstream sync

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docs: restore workspace.package version bump in upstream sync

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docs: align audit-skill-md description with body version phrasing

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docs: fold make-pythonic step into PR 3 of upstream sync

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docs: drop literal Cargo.toml version from audit-skill-md inputs

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