Retired style-factor backtest slice

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This is a historical notice, not a usage guide. The quantile-portfolio backtest described by the former page was removed from the public quant-platform distribution. Function names and parameters in the old examples are not supported by the current portfolio_backtester API.

The migration slice was excluded from the public release on 2026-09-07 because the source code's license and historical authorization had not been confirmed. See commit 62d4a25 and config/migration/provenance.json. The recorded private target has not been created. This repository does not ship the slice or claim a replacement API for it.

The previous technical text remains available in Git history for provenance. Use the current public API reference and implementation as the source of truth for supported interfaces.