Add critical model viability report

[luaroncrew]

Summary

• add a critical viability assessment of the current VibeTrader model
• focus on whether the reported backtest supports a real trading edge
• call out evaluation, regime, baseline, and deployment weaknesses

Test plan

• not run; report-only change based on repository inspection

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[luaroncrew]

Task Deliverables

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Model viability report completed

Added a critical assessment of the VibeTrader model in MODEL_VIABILITY_REPORT.md.

Main conclusion: the current model is an interesting prototype, but not a viable trading model yet because the reported returns are not backed by robust predictive accuracy, baseline comparisons, realistic cost modeling, or multi-regime validation.

graph LR
    A[Diffusion chart generation] --> B[Heuristic signal extraction]
    B --> C[Backtest in bearish regime]
    C --> D[Positive PnL claim]
    D --> E[Insufficient evidence of durable edge]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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