Introduce RoutingConfig with three fields:
- enabled: activates per-turn model routing
- light_model: references a model_name in model_list
- threshold: complexity score cutoff in [0,1]
When routing.enabled is true and the incoming message scores below
threshold, the agent switches to light_model for that turn. Absent or
disabled config leaves existing behaviour completely unchanged.
Example:
"agents": {
"defaults": {
"model": "claude-sonnet-4-6",
"routing": {
"enabled": true,
"light_model": "gemini-flash",
"threshold": 0.35
}
}
}
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