worlds simplest logging to see where things are blocked (#3888)

Co-authored-by: Michael Neale <michael.neale@gmail.com>

crates/goose/src/providers/api_client.rs

@@ -341,6 +341,12 @@ impl<'a> ApiRequestBuilder<'a> {
     }
 
     pub async fn response_post(self, payload: &Value) -> Result<Response> {
+        // Log the JSON payload being sent to the LLM
+        tracing::debug!(
+            "LLM_REQUEST: {}",
+            serde_json::to_string(payload).unwrap_or_else(|_| "{}".to_string())
+        );
+
         let request = self.send_request(|url, client| client.post(url)).await?;
         Ok(request.json(payload).send().await?)
     }