test: add live Binance performance baseline

docs/binance-orderbook-trade-ui-automation.md

@@ -199,6 +199,63 @@ used as a reason to retain event buffers or persistent probes.
   exchange limit minus one.
 - Verify no fills, no residual test-owned orders, and restored page state after each run.
 
+Store every live run as a strict capture rather than copying timing numbers from chat:
+
+```bash
+npm run summarize:binance-orderbook-live -- /path/to/capture.json
+```
+
+The first checked-in L4 reference is the zero-order HYPEUSDT run:
+
+- `e2e/binance-orderbook/live-baselines/no-orders-2026-08-26.capture.json`
+- `e2e/binance-orderbook/live-baselines/no-orders.baseline.json`
+
+Each scenario declares its applicable wall-clock segments and contains at least three
+isolated samples. Every sample must prove restored UI state, no fills, zero residual
+test-owned orders, zero uncaught errors, and bounded long-task observations. Missing
+segments are invalid data, not zero-duration work.
+
+`testOrderLedger` is the evidence behind the fill and cleanup claims. Its `created`,
+`fills`, and `residual` collections use the same exact order identity: symbol, side,
+position side, price, quantity, and creation timestamp. A fill or residual record that
+does not match a created test order invalidates the capture. An empty ledger is valid
+for no-order and dialog-cancel scenarios; account-wide count changes never create test
+ownership.
+
+Compare a new capture with a checked-in summary without making network timing a PR
+gate by default:
+
+```bash
+npm run summarize:binance-orderbook-live -- \
+  /path/to/capture.json \
+  --compare /path/to/baseline.json
+```
+
+`--enforce` is reserved for a controlled machine and stable scenario. It fails only
+when a metric exceeds both the baseline ratio and absolute tolerance recorded in the
+baseline comparison policy. Account orders remain user-owned unless a test ledger
+proves symbol, side, price, quantity, and creation-time ownership.
+
+The baseline JSON root is the generated summary shape plus one required field:
+
+```json
+{
+  "schemaVersion": 1,
+  "capturedAt": "2026-08-26T08:00:00.000Z",
+  "environment": {},
+  "scenarios": [],
+  "comparisonPolicy": {
+    "absoluteToleranceMs": 50,
+    "medianRatio": 1.5,
+    "p95Ratio": 1.5
+  }
+}
+```
+
+The environment and scenarios shown as empty placeholders above must be copied from
+the validated summary output. A malformed or incomplete baseline fails validation;
+it cannot silently turn a regression into a passing comparison.
+
 ## Change Workflow
 
 1. Convert a defect into a failing scenario or invariant assertion.

e2e/binance-orderbook/live-baselines/no-orders-2026-08-26.capture.json

@@ -0,0 +1,74 @@
+{
+  "schemaVersion": 1,
+  "capturedAt": "2026-08-26T08:30:11.000Z",
+  "environment": {
+    "browser": "Chrome 151.0.0.0",
+    "os": "macOS (MacIntel)",
+    "route": "https://www.binance.com/zh-CN/futures/HYPEUSDT",
+    "symbol": "HYPEUSDT",
+    "userscriptSha256": "cc4135902ad4ad62eb6188828479780a8e194713be8067dc10c8c73428c5dcdb",
+    "userscriptVersion": "2.7.119"
+  },
+  "scenarios": [
+    {
+      "name": "cancel-current-symbol-no-orders",
+      "applicableSegments": [
+        "clickToFirstFeedback",
+        "clickToFinalReady"
+      ],
+      "samples": [
+        {
+          "segmentsMs": {
+            "clickToFirstFeedback": 30.6,
+            "clickToFinalReady": 637.1
+          },
+          "testOrderLedger": {
+            "created": [],
+            "fills": [],
+            "residual": []
+          },
+          "stateRestored": true,
+          "noFills": true,
+          "residualTestOrders": 0,
+          "uncaughtErrors": 0,
+          "maxLongTaskMs": 0,
+          "maxLongAnimationFrameMs": 0
+        },
+        {
+          "segmentsMs": {
+            "clickToFirstFeedback": 33,
+            "clickToFinalReady": 630.8
+          },
+          "testOrderLedger": {
+            "created": [],
+            "fills": [],
+            "residual": []
+          },
+          "stateRestored": true,
+          "noFills": true,
+          "residualTestOrders": 0,
+          "uncaughtErrors": 0,
+          "maxLongTaskMs": 0,
+          "maxLongAnimationFrameMs": 0
+        },
+        {
+          "segmentsMs": {
+            "clickToFirstFeedback": 38.3,
+            "clickToFinalReady": 646.7
+          },
+          "testOrderLedger": {
+            "created": [],
+            "fills": [],
+            "residual": []
+          },
+          "stateRestored": true,
+          "noFills": true,
+          "residualTestOrders": 0,
+          "uncaughtErrors": 0,
+          "maxLongTaskMs": 54,
+          "maxLongAnimationFrameMs": 56.1
+        }
+      ]
+    }
+  ]
+}

e2e/binance-orderbook/live-baselines/no-orders.baseline.json

@@ -0,0 +1,49 @@
+{
+  "schemaVersion": 1,
+  "capturedAt": "2026-08-26T08:30:11.000Z",
+  "environment": {
+    "browser": "Chrome 151.0.0.0",
+    "os": "macOS (MacIntel)",
+    "route": "https://www.binance.com/zh-CN/futures/HYPEUSDT",
+    "symbol": "HYPEUSDT",
+    "userscriptSha256": "cc4135902ad4ad62eb6188828479780a8e194713be8067dc10c8c73428c5dcdb",
+    "userscriptVersion": "2.7.119"
+  },
+  "scenarios": [
+    {
+      "name": "cancel-current-symbol-no-orders",
+      "sampleCount": 3,
+      "segmentsMs": {
+        "clickToFirstFeedback": {
+          "min": 30.6,
+          "median": 33,
+          "p95": 38.3,
+          "max": 38.3
+        },
+        "clickToFinalReady": {
+          "min": 630.8,
+          "median": 637.1,
+          "p95": 646.7,
+          "max": 646.7
+        }
+      },
+      "maxLongTaskMs": {
+        "min": 0,
+        "median": 0,
+        "p95": 54,
+        "max": 54
+      },
+      "maxLongAnimationFrameMs": {
+        "min": 0,
+        "median": 0,
+        "p95": 56.1,
+        "max": 56.1
+      }
+    }
+  ],
+  "comparisonPolicy": {
+    "absoluteToleranceMs": 50,
+    "medianRatio": 1.5,
+    "p95Ratio": 1.5
+  }
+}

package.json

@@ -12,6 +12,7 @@
     "import:brooks-media-index": "node scripts/brooks-media-import-index.mjs",
     "download:brooks-media": "node scripts/brooks-media-download.mjs",
     "inspect:binance-orderbook-trade": "node scripts/userscript-release-contract.mjs scripts/binance-orderbook-trade.user.js",
+    "summarize:binance-orderbook-live": "node scripts/binance-live-performance.mjs",
     "check:binance-userscripts": "node --check scripts/binance-orderbook-trade.user.js && node --check scripts/binance-trading-data.user.js && node --check scripts/binance-coinmarketcap-data.user.js",
     "check:binance-orderbook-trade": "node --check scripts/binance-orderbook-trade.user.js",
     "check:m3u8-downloader": "node --check scripts/m3u8-downloader.user.js",