justsisyphus
cd3f80dd0b
docs: add Model Selection System documentation
Comprehensive PRD-style documentation explaining:
- Tiered fallback system (Native → OpenCode Zen → Copilot → Z.ai → Free)
- Native tier cross-fallback logic by capability
- Agent-specific rules (explore, librarian special cases)
- Category-specific rules
- Subscription scenarios with JSON examples
- isMax20 flag impact on model selection
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