Add a top-level changelog.md and update documentation guidance to require and describe its use. .cursor/rules/documentation-rules.mdc: expanded description and added sections for “Changelog vs Dev Log” and “Changelog Format” with Keep a Changelog guidance and an example. .cursor/rules/project-overview.mdc: reference changelog.md and clarify that docs/dev-log.md is for milestones, testing, and discoveries. changelog.md: new file with an [Unreleased] section and an initial 0.0.1 stub (notes that docs/changelog.md was moved).
andrew
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