Extract the per-node pageEmbed remap decision into a shared pure helper
(remapPageEmbedSourceId) and use it BOTH in PageService.duplicatePage and the
JSON walker, so the test guards the real production path (not a mirror that
could drift). Behavior is identical: source in the copied set -> new copy id;
otherwise keep the original. Add jest coverage (16 tests): the remap helper
(in-set/out-of-set/null/nested), syncPageTemplateReferences toDelete (stale refs
removed with the right workspaceId), and insertTemplateReferencesForPages
multi-workspace grouping/filtering.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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