Rooms

registry/rooms owns geometry and spatial composition.

Responsibility

• Allocate width, height, and pane relationships.
• Keep layout deterministic across viewports.
• Stay geometry-only with no theme/color decisions.

Recommended contracts

• rooms.AppShell(w, h, content, footer)
• rooms.SidebarDetail(w, h, sidebarWidth, sidebar, detail, footer)
• rooms.Dashboard(w, h, topLeft, topRight, bottomLeft, bottomRight, footer)
• rooms.DiffWorkspace(w, h, railWidth, header, fileRail, diffMain, footer)

Core primitives

• Focus family: Focus, Pancake, TopbarPancake
• Rail/split: Rail, RailFooterStack, HSplit, VSplit, HSplitFooter
• Multi-pane: HolyGrail, TripleCol, DrawerRight, DrawerChrome
• Dashboard: Dashboard2x2, Dashboard2x2Footer
• Overlay/strip: Modal, BigTopStrip

Contract

• Rooms are import-only and geometry-only.
• Frame era APIs are removed; use current room contracts.
• Compose room output through surface in app View().
• Rooms do not import theme, bricks, or raw bubbles (guardrail-enforced).