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Verify each consumer history segment before opening a source editor. Start new segments after external writes while retaining undo entries, no-op baselines and recorded failures. Add real-event controls for update-main, older undo/redo and failure preservation. The original F250 regression passes with unchanged assertions. Validation: 1,768 frontend tests, 15,004 assertions; lint and format pass. This changes only the frontend test harness; no sync benchmark is needed. AI-assisted-by: gpt-6