fix(tests): replace serde_json::from_str with serde_yaml::from_str for tool output assertions

server/src/handlers/git.rs

@@ -191,7 +191,7 @@ mod tests {
             .map_err(|e| format!("Failed to get worktree context: {}", e))
             .unwrap();
 
-        let parsed: serde_json::Value = serde_json::from_str(&result).unwrap();
+        let parsed: serde_json::Value = serde_yaml::from_str(&result).unwrap();
         assert!(parsed.get("branch").is_some());
         assert!(parsed.get("modified_files").is_some());
         assert!(parsed.get("diff").is_some());
@@ -210,7 +210,7 @@ mod tests {
             .map_err(|e| format!("Failed to get worktree context: {}", e))
             .unwrap();
 
-        let parsed: serde_json::Value = serde_json::from_str(&result).unwrap();
+        let parsed: serde_json::Value = serde_yaml::from_str(&result).unwrap();
         assert!(parsed.get("branch").is_some() || parsed.is_object());
     }
 }

server/src/handlers/graph.rs

@@ -1643,7 +1643,7 @@ mod tests {
             .execute(json!({"limit": 1, "offset": 0}), state.clone())
             .await
             .unwrap();
-        let parsed_paged: serde_json::Value = serde_json::from_str(&paged_res).unwrap();
+        let parsed_paged: serde_json::Value = serde_yaml::from_str(&paged_res).unwrap();
         assert_eq!(parsed_paged["total_count"], 2);
         assert_eq!(parsed_paged["has_more"], true);
     }

server/src/handlers/meta.rs

@@ -1985,8 +1985,8 @@ mod tests {
             .await
             .map_err(|e| crate::error::AppError::Internal(e.to_string()))
             .unwrap();
-        let uuid_start = debt_list.find("id\":\"").unwrap() + 5;
+        let debt_list_val: serde_json::Value = serde_yaml::from_str(&debt_list).unwrap();
-        let uuid = &debt_list[uuid_start..uuid_start + 36];
+        let uuid = debt_list_val[0]["id"].as_str().unwrap();
 
         let resolve_debt = TechDebtHandler;
         resolve_debt

server/src/handlers/vision.rs

@@ -1039,7 +1039,7 @@ mod tests {
             .unwrap();
 
         // Returns a JSON string, possibly {}
-        let parsed: serde_json::Value = serde_json::from_str(&result).unwrap();
+        let parsed: serde_json::Value = serde_yaml::from_str(&result).unwrap();
         assert!(parsed.is_object());
     }
 
@@ -1055,7 +1055,7 @@ mod tests {
             .map_err(|e| format!("Failed to read clipboard: {}", e))
             .unwrap();
 
-        let parsed: serde_json::Value = serde_json::from_str(&result).unwrap();
+        let parsed: serde_json::Value = serde_yaml::from_str(&result).unwrap();
         assert!(parsed.is_object());
     }
 
@@ -1175,7 +1175,7 @@ mod tests {
             .execute(json!({ "action": "image" }), Arc::clone(&state))
             .await
             .unwrap();
-        let img_val: Value = serde_json::from_str(&img_res_str).unwrap();
+        let img_val: Value = serde_yaml::from_str(&img_res_str).unwrap();
         assert_eq!(img_val["file_path"], "C:\\tmp\\image_b.jpg");
         assert_eq!(img_val["file_path_wsl"], "/mnt/c/tmp/image_b.jpg");
         assert_eq!(img_val["width"], 1200);
@@ -1188,7 +1188,7 @@ mod tests {
             .execute(json!({ "action": "text" }), Arc::clone(&state))
             .await
             .unwrap();
-        let text_val: Value = serde_json::from_str(&text_res_str).unwrap();
+        let text_val: Value = serde_yaml::from_str(&text_res_str).unwrap();
         assert_eq!(text_val["text"], "Some random stackoverflow URL");
 
         // Action 'history' MUST show both items
@@ -1196,7 +1196,7 @@ mod tests {
             .execute(json!({ "action": "history" }), Arc::clone(&state))
             .await
             .unwrap();
-        let hist_val: Value = serde_json::from_str(&hist_res_str).unwrap();
+        let hist_val: Value = serde_yaml::from_str(&hist_res_str).unwrap();
         let history = hist_val.as_array().unwrap();
         assert!(history.len() >= 4);
     }