Architecture
The seven-layer architecture of the Verum TUI framework and why it's organised that way.
The Elm pattern
Model / update / view / subscriptions in Verum, with full async integration.
The event loop
How events flow from termios up to `update`, and how async commands round-trip back.
Rendering
Cells, buffers, diff, synchronized output — how a frame becomes terminal bytes.
Layout
Rect, Constraint, Flex, Grid — three complementary layout engines.