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Add Phase 5 pod-shop combinatorial mining to edge-hunting.md

20 signals with positive marginal mined from registry + factorial. Key finds from 2,048-combo factorial: - contextXg: +0.39% main effect (biggest single boost)

20 signals with positive marginal mined from registry + factorial. Key finds from 2,048-combo factorial:

• contextXg: +0.39% main effect (biggest single boost)
• leagueExcl: +0.21% (in production)
• Best combo: regime+finishing+crossBtts+leagueExcl+finishingLuck → +10.4%
• Production: variance+regime+leagueExcl → +9.8% (+0.6pp gap)
• Dead: gkChange, squadStrength (0.00%), crossOu (-0.92%)
• Variance hurts entryROI (-0.15%) despite being in production

9 signals promoted for expanded factorial (5.2-5.9): odds-quality-routing, ah-market-routing, gk-psxg, setpiece-xga, inter-model-disagreement, multi-source-regression, promoted-arc, tc2-home-ah-rescue

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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