Their own sites.

Each habitat keeps its own crate. Each crate keeps Org under docs/orgmode/ and a Sphinx site, the same shape as vissue. This page is a directory.

The loops, drawn

The memory loop: write, review clock, due, graded, islands, fire, retract
The memory loop: a write enters the review clock; recall and the hook read it; graded reschedules it; a rewrite closes the earlier claim.
The handover: satchel, atoms, deeds, seal and sign; then verify and import
The handover: satchel, atoms and deeds sealed and signed; the receiver verifies before it imports, and refuses one altered byte.

Steppers and the fold

Steppers. The saddle stack and the SketchMap crate the island uses.

Cards are files a person writes. They have no crate. Cards field note.