Add YAML frontmatter to exported notes

[HansF]

Summary

• add a reusable helper to emit consistent YAML frontmatter blocks for exported notes
• include frontmatter metadata for overview, year, issue, and generation notes with list-friendly author/tag fields
• document the frontmatter fields emitted for each note type in the Obsidian export guide

Testing

• node export-obsidian.mjs --help

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[chatgpt-codex-connector]

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