Backend:
- Enrich machine snapshot with componentLinks/pieceLinks/productLinks
- Detect link add/remove in MachineAuditSubscriber onFlush
- Add link diff comparison in restore preview
- Add link restoration in applyRestore for machines
- Add integrity warnings for missing linked entities
Frontend (submodule update):
- Single save button replacing auto-save-on-blur
- Link versioning display in version list and restore modal
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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