Use this read-only diagnostic tool to explain why the alpha-opportunity board includes, excludes, or demotes rows. It returns issuer-type, identity, quality-gate, and raw-alpha-versus-board-rank summaries from the same scoring universe used by deltasignal_alpha_opportunities. Parameters: limit is 1-100 for bounded samples; source_date replays a known YYYY-MM-DD slice; issuer_type narrows the audit to operating_company, etf_trust, fund_vehicle, foreign_issuer, unresolved_identifier, or all; include_rows=true attaches full publishable audit rows and should be used only for explicit debugging. Behavior: read-only and idempotent; it performs one HTTPS read, has no destructive side effects, and does not change board scoring, payments, wallets, files, or account state. Use it after deltasignal_alpha_opportunities or deltasignal_alpha_sweep when the user asks why a high raw alpha row is missing, why ETF/trust/fund rows are excluded by default, why a row was demoted, or whether a screen is safe to summarize.
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