refactor: improve code formatting and structure across multiple files

src/providers/anthropic.rs

@@ -72,7 +72,10 @@ enum NativeContentOut {
         input: serde_json::Value,
     },
     #[serde(rename = "tool_result")]
-    ToolResult { tool_use_id: String, content: String },
+    ToolResult {
+        tool_use_id: String,
+        content: String,
+    },
 }
 
 #[derive(Debug, Serialize)]

src/providers/openrouter.rs

@@ -356,9 +356,11 @@ impl Provider for OpenRouterProvider {
         model: &str,
         temperature: f64,
     ) -> anyhow::Result<ProviderChatResponse> {
-        let api_key = self.api_key.as_ref().ok_or_else(|| anyhow::anyhow!(
+        let api_key = self.api_key.as_ref().ok_or_else(|| {
+            anyhow::anyhow!(
             "OpenRouter API key not set. Run `zeroclaw onboard` or set OPENROUTER_API_KEY env var."
-        ))?;
+        )
+        })?;
 
         let tools = Self::convert_tools(request.tools);
         let native_request = NativeChatRequest {

src/providers/traits.rs

@@ -108,7 +108,8 @@ pub trait Provider: Send + Sync {
         model: &str,
         temperature: f64,
     ) -> anyhow::Result<String> {
-        self.chat_with_system(None, message, model, temperature).await
+        self.chat_with_system(None, message, model, temperature)
+            .await
     }
 
     /// One-shot chat with optional system prompt.