Return the full self-verifying AUDIT BUNDLE for a stored result as JSON - the same
artifact the result page's "Export Audit Bundle" download produces, delivered in chat.
It lets an external auditor independently reproduce every figure: raw input series
(with re-derived SHA-256 hashes), every assumption, every displayed metric and its
formula, data provenance (flagging any caller-supplied data as NOT verified by
Helvetic), integrity checks, warnings, and a content hash of the bundle itself.
backtest_id: from run_backtest, run_quant_research, run_universe_research,
run_custom_ohlcv, run_custom_signal, or analyze_track_record.
Use this when a client needs audit-grade reproducibility evidence in the conversation;
pair with generate_report for the branded PDF/Excel/CSV.
Connector