ol_insider_cluster_scan

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FLAGSHIP MOAT: scan for ACTIVE multi-insider cluster-buy/sell signals (distinct-actor Form 4 clusters with statistical strength). THREE GRAINS: pass `tickers` for a watchlist, a single `ticker` for that name's recent fired clusters, or NEITHER for the MARKET-WIDE scan (top fired clusters across every ticker, one row per ticker and direction). Returns {summary, count, events, grain, since_days, limit}; each event is {ticker, direction, insider_count, z_score, sector_z_score, percentile, window_start, window_end}. No fired clusters returns events=[] -- absence is not a signal; an unreachable store is REFUSED. Source: SEC EDGAR Form 4, windowed on FILING date so it is look-ahead-safe; FREE. Caveats ride the response's tool_notes.