docs-review-changelog

@elastic

Validate and assess the quality of Elastic changelog YAML files against current Elastic standards. Reports schema errors, content quality issues, systematic pattern violations, type-title alignment mismatches, and overly technical content that needs user-focused rewrites. Features repository-aware area validation. Fetches canonical guidance to stay in sync. Use when checking or reviewing changelog files before merging — pairs with docs-fix-changelog to get suggested fixes.