Open a design: reset the allocators and admit every sheet in read order, so the same design gets the same ids each time it is opened. Returns the sheets and the names of any whose ids had to change.

Admit a sheet into the open design, re-minting what breaks an invariant: a component id already used elsewhere in the design (component ids are design-unique), or any id that is a sentinel or duplicated within the sheet (per-sheet uniqueness is every kind's floor). Clean ids are reserved so later minting cannot collide with them. Returns the sheet and whether anything had to change.

Give every component, port and connection on a sheet fresh ids from the design's allocators, rewriting every reference. Used when a sheet is copied into a project: Import / Duplicate Sheet, and library component materialisation.

Apply id maps - component, port and connection ids are separate namespaces, so separate maps - to a canvas: ids, host ids, symbol layout maps, parameter slots, endpoints.

Apply id maps to everything a LoadedComponent holds: the canvas, the parameter slots and the saved waveform selection, which live on the LoadedComponent rather than in its CanvasState.