test(web): enforce one-pass smoke execution

docs/WEB_FEATURE_SMOKE_PLAN.md

@@ -25,6 +25,7 @@
    - 第一轮全部按计划执行一次；失败项记录在 `tests/golden/WBV2/feature-smoke-report.json`。
 - 失败项标记为 `FAILED_FOCUSED_FIX_REQUIRED`，不伪造通过，也不在同一轮重复执行。
 - 修复必须建立新的聚焦任务和新的烟测批次；已通过功能不重跑。
+- 同一 `planId` 已存在尝试记录时，运行器会拒绝再次执行；必须更换批次 ID 或使用独立的聚焦修复入口。
 
 ## 执行命令
 

tests/golden/WBV2/feature-smoke-manifest.json

@@ -16,7 +16,7 @@
   },
   "planDocument": {
     "path": "docs/WEB_FEATURE_SMOKE_PLAN.md",
-    "sha256": "d3f6391efa860c7f9be2bbd5ff4ff9dad8477b1e92cd7c9d618743a0cfbe92ec"
+    "sha256": "fd3f4966351051b8feb518c898a9f9cfdf9bcfbbca17194ca41098256cabc65b"
   },
   "summary": {
     "totalFeatures": 34,

tools/web/run-wbv2-feature-smoke-plan.mjs

@@ -42,6 +42,14 @@ if (!execute) {
   process.exit(0);
 }
 
+if (fs.existsSync(reportPath)) {
+  const previous = JSON.parse(fs.readFileSync(reportPath, "utf8"));
+  if (previous.planId === plan.planId && Array.isArray(previous.cases) && previous.cases.some((item) => Number(item.attempts ?? 0) > 0)) {
+    process.stderr.write(`feature-smoke-once-only: plan ${plan.planId} already has recorded attempts; create a new focused-fix batch instead of rerunning\n`);
+    process.exit(2);
+  }
+}
+
 const startedAt = new Date().toISOString();
 const smokeReport = {
   schemaVersion: 1,