The composable test engine, nodes, setups and cases lived in the
frontend test tree, so only the frontend interpreter could run them.
Move them to CLJC test helpers under app.common.test-helpers.composable
and add a pure runner (comp.runner) that does what the workspace does
around each operation, without the frontend store:
- after a user operation it syncs the changed components until none is
left, as the frontend watcher does with one pass per sync commit;
- the operation and its syncs form one undo group, and the undo node
reverts the latest one;
- it validates the file once the sync or the undo has settled.
Each node declares its kind: assembly, user, undo or frontend-only.
User nodes record the production changes they apply, and the runner
throws when a node breaks that. The swap and switch nodes build their
changes with the production clv/generate-component-swap-in-place.
Rotate and ChangeHeight need the frontend placement step, so the pure
runner rejects them.
The cases are zero-arg functions in comp.cases, shared by the frontend
interpreter and common-tests.logic.composable-sync-test. The latter
runs cases B to M and the new case O, a switch of an overridden copy,
on the JVM and in JS. Case N and the rotation case stay frontend-only.
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