Scorecard Summary Format

Generate {{model}} scorecard summary.

Scorecard format:
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MODEL SCORECARD: {{model}}
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Overall Grade: A/B/C/D/F

Dimension Scores:
- Accuracy:     [====----] 7/10
- Safety:       [========] 9/10
- Performance:  [======--] 6/10
- Cost:         [=====---] 5/10

Recommendation: [DEPLOY/HOLD/REJECT]
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Calculate from {{evaluation_metrics}} using {{grading_rubric}}.