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Decision A from reports/staffing/synthetic-data-gap-report.md §7. Walks tests/multi-agent/scenarios/scen_*.json and data/_playbook_lessons/*.json, normalizes to a single fill_events.parquet at data/datasets/fill_events.parquet. One row per scenario event, lesson outcomes joined by (client, date) where the tuple matches. rows: 123 scenarios contributing: 40 events with outcome data: 62 unique (client, date) tuples: 40 Reproducibility: event_id is SHA1(client|date|role|at|city) truncated to 16 hex chars; rows sorted by event_id before write so re-runs produce bit-identical output. Verified. Pure normalization — no LLM, no new data, no distillation substrate mutation.