refactor: streamline JSON file reading logic and improve error handling in findings.js and git.js

app/findings.js

@@ -18,25 +18,31 @@ export async function analyzeWithRole(role, diff) {
 }
 
 /**
- * 讀取舊 findings（從 workspace 的 FINDINGS_PATH）
+ * 讀取 JSON 陣列檔案，失敗或不存在時回傳空陣列
  */
-export function loadOldFindings(workspace) {
-  const fullPath = path.join(workspace, FINDINGS_PATH);
+function readJSONArray(fullPath, label) {
   if (!fs.existsSync(fullPath)) {
-    console.log('  舊 findings 檔案不存在，視為空');
+    console.log(`  ${label}檔案不存在，視為空`);
     return [];
   }
   try {
     const data = JSON.parse(fs.readFileSync(fullPath, 'utf8'));
-    const old = (Array.isArray(data) ? data : []).map(f => ({ ...f, is_new: false }));
-    console.log(`  讀取舊 findings: ${old.length} 筆`);
-    return old;
+    return Array.isArray(data) ? data : [];
   } catch (e) {
-    console.log(`  ⚠️  讀取舊 findings 失敗: ${e.message}，視為空`);
+    console.log(`  ⚠️  讀取${label}失敗: ${e.message}，視為空`);
     return [];
   }
 }
 
+/**
+ * 讀取舊 findings（從 workspace 的 FINDINGS_PATH）
+ */
+export function loadOldFindings(workspace) {
+  const old = readJSONArray(path.join(workspace, FINDINGS_PATH), '舊 findings ').map(f => ({ ...f, is_new: false }));
+  console.log(`  讀取舊 findings: ${old.length} 筆`);
+  return old;
+}
+
 /**
  * 合併新舊 findings，以 (role + location + suggestion前50字) 為 key 去除重複
  */
@@ -97,20 +103,9 @@ export async function deduplicateWithAI(findings) {
  * 讀取排除問題檔案（從 workspace 的 EXCLUSIONS_PATH）
  */
 export function loadExclusions(workspace) {
-  const fullPath = path.join(workspace, EXCLUSIONS_PATH);
-  if (!fs.existsSync(fullPath)) {
-    console.log('  排除問題檔案不存在，跳過過濾');
-    return [];
-  }
-  try {
-    const data = JSON.parse(fs.readFileSync(fullPath, 'utf8'));
-    const exclusions = Array.isArray(data) ? data : [];
-    console.log(`  讀取排除問題: ${exclusions.length} 筆`);
-    return exclusions;
-  } catch (e) {
-    console.log(`  ⚠️  讀取排除問題失敗: ${e.message}，跳過過濾`);
-    return [];
-  }
+  const exclusions = readJSONArray(path.join(workspace, EXCLUSIONS_PATH), '排除問題');
+  console.log(`  讀取排除問題: ${exclusions.length} 筆`);
+  return exclusions;
 }
 
 /**