The frame, draw, camera, query and capture ports move out of the
conformance scene renderer into src/render/cesium/ports.js, unchanged.
The app's transitional renderer, now src/render/cesium/appRenderer.js,
builds the same ports over the full viewer; it still leaves out globe,
whenSettled and setTime, which would misreport photoreal tiles and stop
the app clock.
Disposing the ports now settles a pending renderOnce and detaches the
draw sets, so a model that loads after destroy is destroyed rather than
added to a destroyed collection. A viewer whose ports fail to build is
destroyed with its credits.
Checked in a browser: the app boots with one credits element, and all
eleven conformance scenes match their references exactly.
