perf(LLM 併發): 角色分析與誤報/補行號裁決改為並行 sub-agent（預設不限併發）

src/main.js

@@ -9,6 +9,7 @@ import { getRunUsage, getRateLimit, fetchAccountQuota, formatUsageStats, formatU
 import { cloneRepo, commitAndPush, getRepoState } from './git.js';
 import { validateJSONArrayFile, ensureJSONArrayFileExists } from './json.js';
 import { runPreflight } from './preflight.js';
+import { mapWithConcurrency, LLM_CONCURRENCY } from './llm.js';
 import { section, step, line, input, output, result, warn, error } from './log.js';
 
 const WORKSPACE = process.env.GITHUB_WORKSPACE || '/workspace';
@@ -120,15 +121,21 @@ async function main() {
   } catch (e) {
     warn(`角色介紹 comment 發布失敗（繼續執行）: ${e.message}`);
   }
+  // 各角色以獨立 LLM 子行程並行分析（併發上限見 LLM_CONCURRENCY），單一角色失敗僅 warn 後跳過。
   const newFindings = [];
   let fulfilledAnalyses = 0;
-  for (const role of roles) {
+  const roleResults = await mapWithConcurrency(roles, LLM_CONCURRENCY, async (role) => {
     try {
-      const findings = await analyzeWithRole(role, diff);
-      fulfilledAnalyses += 1;
-      newFindings.push(...findings);
+      return await analyzeWithRole(role, diff);
     } catch (e) {
       warn(`[${role.name}] 分析失敗（跳過）: ${e.message}`);
+      return null;
+    }
+  });
+  for (const findings of roleResults) {
+    if (findings) {
+      fulfilledAnalyses += 1;
+      newFindings.push(...findings);
     }
   }
   if (fulfilledAnalyses === 0) {