plan(numbering): step-by-step implementation plan
15 tasks across 8 phases — foundation (sequences + mixin + SO fields), quote/SO rename, WO grouping rewrite, invoice block + naming, child model wiring (CoC/RCV/DLV/PU/NCR/CAPA/Hold/RMA), immutability + unlink block, view + report fixes, end-to-end walkthrough. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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