Restructure the evolution process documentation#2953

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rjmccall wants to merge 4 commits intoswiftlang:mainfrom

rjmccall:process-update

Commits on Sep 17, 2025

Restructure the evolution process documentation to better explain the
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Outline the evolution review process separately from the participation
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Commits on Sep 18, 2025

Revise the description of the full and lightweight review processes
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Commits on Sep 19, 2025

Authority over SPM proposals actually resides with the ESG now.
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