缓存 sccache 探测结果避免重复阻塞

在当前 dev 编排进程内复用 sccache wrapper 探测结果

避免 API 与 worker 重启重复同步等待

同步更新排障文档

scripts/dev.mjs

@@ -146,6 +146,8 @@ function applyLocalFfmpegEnv(env, platform = process.platform) {
   return env;
 }
 
+const localSccacheProbeCache = new Map();
+
 function resolveLocalDevRustcWrapperBypass(options = {}) {
   if (process.platform !== 'win32') {
     return '/usr/bin/env';
@@ -154,6 +156,12 @@ function resolveLocalDevRustcWrapperBypass(options = {}) {
   const sccacheAvailable =
     options.sccacheAvailable ??
     (() => {
+      const cacheKey = `${process.platform}:sccache`;
+      const cached = localSccacheProbeCache.get(cacheKey);
+      if (cached !== undefined) {
+        return cached;
+      }
+
       const result = spawnSync('sccache', ['rustc', '-vV'], {
         cwd: repoRoot,
         encoding: 'utf8',
@@ -161,7 +169,9 @@ function resolveLocalDevRustcWrapperBypass(options = {}) {
         windowsHide: true,
         timeout: options.sccacheProbeTimeoutMs ?? 10_000,
       });
-      return !result.error && result.status === 0;
+      const available = !result.error && result.status === 0;
+      localSccacheProbeCache.set(cacheKey, available);
+      return available;
     })();
   return sccacheAvailable ? 'sccache' : '';
 }