docs: Add perfect quality score separation data (validates 91 threshold)
Critical finding from 7 v8 trades analysis:
- ALL 4 winners: quality ≥95 (95, 95, 100, 105)
- ALL 3 losers: quality ≤90 (80, 90, 90)
- Perfect separation validates 91 threshold decision
- Would have prevented 100% of losses (-$624.90 total)
Updated:
- SIGNAL_QUALITY_SETUP_GUIDE.md (overview + threshold history)
- SIGNAL_QUALITY_OPTIMIZATION_ROADMAP.md (current system)
- BLOCKED_SIGNALS_TRACKING.md (quality score analysis)
- .github/copilot-instructions.md (data validation sections)
This proves 91 is data-driven optimal, not too strict.
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