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Add held-out test set validation and S3 multi-pair expansion
Test set (Sep 2023 - Dec 2024): only S9_Filtered passes (PF=1.13), portfolio PF=0.91 FAIL. S3 expansion to GBP_USD, EUR_USD, GBP_AUD shows no generalization — GBP_JPY remains the only viable pair. No strategy is consistently profitable across all 4 validation periods. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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