Oracle wave-3 caveat: 'A toast alone is insufficient if the app marks
the wizard state as attached locally and never retries.'
Track draft.wizardConfigAttached. Set true only after the initial PUT
resolves. In handleStructureSave (Confirm Structure), if not yet
attached, retry updateDraftConfig before applying the structure batch.
Failure of the retry is logged but doesn't block save — structure
still lands and downstream config sync can pick up later.
