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Blueprint: end_date format changed from 'Y-m-d H:i' to 'Y-m-d' — the demo frontmatter stores dates without a time component so Admin was failing to parse it and showing the field empty. Template: three-case smart range formatting: - Same month & year → 01 – 03 Sep 2025 - Same year only → 01 Jan – 03 Sep 2025 - Different years → 01 Jan 2025 – 03 Feb 2026 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Vgmzx8VTTTmCskSpQtsLTr