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Locks in the synthetic-report parity rule as a global "Assumptions and Defaults" entry in ui/PLAN.md: every phase that extends the server->UI report contract must also extend the legacy parser in the same PR (or document in tools/local-dev/legacy-report/README.md why the new field cannot be derived from legacy text). The Go side already enforces shape compatibility via the pkg/model/report import; this rule extends that mechanical guard to "did we remember to wire the new field through". ui/docs/testing.md grows a "Synthetic reports for visual testing" section with the full conversion -> load -> compose loop and the two operational gotchas (no network on synthetic ids, page reload clears the in-memory map). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>