Persist provider name and model config in the session (#5419)

crates/goose/src/model.rs

@@ -1,6 +1,7 @@
 use once_cell::sync::Lazy;
 use serde::{Deserialize, Serialize};
 use thiserror::Error;
+use utoipa::ToSchema;
 
 const DEFAULT_CONTEXT_LIMIT: usize = 128_000;
 
@@ -67,7 +68,7 @@ static MODEL_SPECIFIC_LIMITS: Lazy<Vec<(&'static str, usize)>> = Lazy::new(|| {
     ]
 });
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize, ToSchema)]
 pub struct ModelConfig {
     pub model_name: String,
     pub context_limit: Option<usize>,