Architecture overview

# Architecture overview

- **Which document owns each architectural concern?** [Authority map](authority.md).
- **What are the non-negotiable foundations?** [Foundations](foundations.md).
- **Which terms carry architectural meaning?** [Glossary](glossary.md).
- **Why was the tree reorganised?** [Migration rationale](migration-rationale.md).
- **Where should a reader go next?** [Next reads](next-reads.md).
- **How does the one-writer model work?** [One writer](one-writer.md).
- **How do the four runtime roles relate?** [Runtime roles](runtime-roles.md).

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