Rune documentation

These documents specify how Rune behaves. They describe what the code does today, not plans.

• Spaces and setups: what a window shows, and where its configuration is stored.
• Layout: how columns, cards, and the hub are arranged, sized, and moved.
• Cards: the card file format, what a source prints, and what an item can do.
• Agent control: the MCP server that lets an agent act on the window it runs in.

The terms used here are defined in the Glossary section of AGENTS.md.