chore(evals): add personas CSV and Markdown summaries

Author: haasonsaas

reports/personas.csv

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+scenario_id,count,avg_critic_score,avg_overlap,avg_latency_ms
+seed_ceo_focus,1,9.0,0.0,12843.744039535522
+series_a_ceo_retention,1,9.0,0.0,14227.832794189453
+consumer_app_activation,1,10.0,0.0,22965.211868286133
+enterprise_pipeline,1,9.0,0.0,11418.672800064087
+pricing_reframe,1,9.0,0.0,10158.666133880615

reports/personas.md

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+| Scenario | Count | Avg Score | Overlap | Latency (ms) |
+|---|---:|---:|---:|---:|
+| seed_ceo_focus | 1 | 9.00 | 0.00 | 12844 |
+| series_a_ceo_retention | 1 | 9.00 | 0.00 | 14228 |
+| consumer_app_activation | 1 | 10.00 | 0.00 | 22965 |
+| enterprise_pipeline | 1 | 9.00 | 0.00 | 11419 |
+| pricing_reframe | 1 | 9.00 | 0.00 | 10159 |