fix: use historical correlation percentiles - #457
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Co-Authored-By: Codex <noreply@openai.com>
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Replace the correlation value-to-percentile mapping with an empirical percentile over equivalent rolling 60-day correlation windows. Require a full aligned year of evidence and use a neutral fallback when unavailable. This only improves research and Shadow regime context; it does not alter execution permissions, runtime targets, broker settings, or submit orders. Validation: targeted pytest, ruff, and diff check.