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index.md — directory listing for progressive disclosure.
NO frontmatter, EXCEPT the bundle-root index.md may declare okf_version.
Prefer generating these with scripts/build_index.py --write.
Root index.md example shown below; for subdirectories drop the frontmatter block.
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---
okf_version: "0.1"
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# Bundle Name

One sentence describing the whole bundle and who should consume it.

## Sections

* [Datasets](datasets/) - what data exists
* [Tables](tables/) - detailed schemas
* [Metrics](metrics/) - business metric definitions

## Concepts

* [Some Root Concept](some-root-concept.md) - one-line description
