feat(provider): add Wanjie Ark support

crates/agent/src/lib.rs

@@ -87,6 +87,16 @@ impl Default for ModelRegistry {
                 supports_tools: true,
                 supports_reasoning: false,
             },
+            ModelInfo {
+                id: "deepseek-reasoner".to_string(),
+                provider: ProviderKind::WanjieArk,
+                aliases: vec![
+                    "wanjie-deepseek-reasoner".to_string(),
+                    "ark-wanjie-deepseek-reasoner".to_string(),
+                ],
+                supports_tools: true,
+                supports_reasoning: true,
+            },
             ModelInfo {
                 id: "deepseek/deepseek-v4-pro".to_string(),
                 provider: ProviderKind::Openrouter,
@@ -361,6 +371,16 @@ mod tests {
         assert_eq!(resolved.resolved.id, "deepseek/deepseek-v4-pro");
     }
 
+    #[test]
+    fn wanjie_ark_default_uses_reasoner_model_id() {
+        let registry = ModelRegistry::default();
+        let resolved = registry.resolve(None, Some(ProviderKind::WanjieArk));
+
+        assert_eq!(resolved.resolved.provider, ProviderKind::WanjieArk);
+        assert_eq!(resolved.resolved.id, "deepseek-reasoner");
+        assert!(resolved.resolved.supports_reasoning);
+    }
+
     #[test]
     fn novita_default_uses_namespaced_model_id() {
         let registry = ModelRegistry::default();