v4

Added

• Validation that every released ## [version] section has a trailing release date in the format - YYYY-MM-DD, and that [Unreleased] does not.

Fixed

• extract/action.yml's mdq selector was invalid syntax and silently failed to match dated version headings (e.g. ## [1.7.1] - 2026-08-31). Replaced with an anchored regex selector that matches whether or not the heading resolves as a reference link, without colliding on version-prefix overlaps (e.g. 1.1 vs 1.10).