Use this read-only screening tool to rank the active DeltaSignal issuer universe by deterministic Phase 1 alpha score. It returns opportunity rows with ticker, CIK/entity metadata when available, issuer type, raw alpha score, board rank score, risk tier, debt coverage, quality, treasury, regime, and provenance fields. Parameters: limit is 1-100; source_date replays a known YYYY-MM-DD slice; risk_tier, quality_flag, issuer_type, include_funds, and debt_coverage_status narrow the screen. Behavior: read-only and idempotent; it performs one HTTPS read, has no destructive side effects, and does not handle wallets, payments, orders, or account state. Default behavior returns operating-company issuers. Use include_funds=true or issuer_type=etf_trust|fund_vehicle|all only when the user asks for ETF, trust, fund, or product-vehicle screens. High scores are drilldown candidates, not standalone conclusions.