Expand model-specific prompt routing section with insights from
the actual Prometheus GPT prompt development session:
- Why Claude vs GPT models need fundamentally different prompts
- Principle-driven (GPT) vs mechanics-driven (Claude) approach
- "Decision Complete" concept from Codex Plan Mode
- Why more rules help Claude but hurt GPT (contradiction surface)
- Concrete size comparison (1100 lines Claude vs 300 lines GPT)
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