Include hosted commit in benchmark exports

README.md

@@ -18,7 +18,7 @@ Static browser demo for client-side voice interaction:
 
 Open the Space, click **Load models**, then **Start mic**. The first load downloads model assets into the browser cache; after that, inference runs in the tab with no server inference.
 
-After benchmark or real-mic runs, use **Download JSON** to save the `{ summary, results }` evidence file locally.
+After benchmark or real-mic runs, use **Download JSON** to save the evidence file locally. The export includes the hosted Space commit when the static host exposes it.
 
 Known testing notes:
 

app.js

@@ -162,6 +162,13 @@ const state = {
   ttsVoiceRequests: new Map(),
   automationSynthesisRequestId: 0,
   automationSynthesisRequests: new Map(),
+  hostMetadata: {
+    page: location.href,
+    host: location.host,
+    hfSpaceCommit: "",
+    etag: "",
+    fetchedAt: "",
+  },
   activeTurnId: 0,
   modelLoadStartedAt: null,
   loadedStack: null,
@@ -390,6 +397,24 @@ function logEvent(message) {
   }
 }
 
+async function refreshHostMetadata() {
+  try {
+    const response = await fetch(location.href, { method: "HEAD", cache: "no-store" });
+    state.hostMetadata = {
+      page: location.href,
+      host: location.host,
+      hfSpaceCommit: response.headers.get("x-repo-commit") ?? "",
+      etag: response.headers.get("etag") ?? "",
+      fetchedAt: new Date().toISOString(),
+    };
+  } catch {
+    state.hostMetadata = {
+      ...state.hostMetadata,
+      fetchedAt: new Date().toISOString(),
+    };
+  }
+}
+
 function setLoadButton(mode) {
   const options = {
     load: { icon: "↓", label: "Load models", disabled: false },
@@ -1322,6 +1347,7 @@ function editDistance(reference, hypothesis) {
 function runtimeEnvironment() {
   return {
     page: location.href,
+    hostMetadata: { ...state.hostMetadata },
     secureContext: window.isSecureContext,
     userAgent: navigator.userAgent,
     platform: navigator.platform || "",
@@ -1634,6 +1660,8 @@ function exportBenchmarkSummary() {
 
 function benchmarkExportPayload() {
   return {
+    generatedAt: new Date().toISOString(),
+    hostMetadata: { ...state.hostMetadata },
     summary: exportBenchmarkSummary(),
     results: [...state.benchmarkResults],
   };
@@ -2596,6 +2624,7 @@ updateTtsStepsLabel();
 updateVadSilenceLabel();
 updateMicValidationStatus();
 installAutomationApi();
+refreshHostMetadata().catch(() => {});
 initRuntimeSupport();
 
 async function initRuntimeSupport() {