(MOT-4277) feat(harness): preview local E2E results

.github/benchmark-site/README.md

@@ -5,7 +5,27 @@ This static shell replaces the generic benchmark-action index at
 for metric trends. `executions.js` indexes workflow attempts, and
 `runs/<execution-id>.json` supplies the complete retained reports.
 
-Open a local preview from the repository root:
+Import the default local report and serve the real dashboard from the repository
+root:
+
+```bash
+python3 .github/scripts/serve_harness_e2e_dashboard.py
+```
+
+Pass files or directories to import other local executions:
+
+```bash
+python3 .github/scripts/serve_harness_e2e_dashboard.py \
+  harness/target/e2e-reactive-fix/results.json \
+  target/harness-e2e-glm-5.2
+```
+
+Imports accumulate in `target/harness-e2e-dashboard-local`. Reimporting the same
+report is idempotent. Use `--reset` to start a new local history, or `--host`
+and `--port` to change the default `127.0.0.1:4173` listener. The command only
+reads existing reports; it does not run E2E scenarios.
+
+To preview the sample fixtures instead, serve `.github/benchmark-site` directly:
 
 ```bash
 python3 -m http.server 4173 --directory .github/benchmark-site

.github/benchmark-site/execution-data.js

@@ -307,6 +307,7 @@
     );
     return {
       schemaVersion: Number(raw.schema_version) || 1,
+      mode: raw.mode === "local" ? "local" : "published",
       lastUpdate: raw.last_update || benchmarkData?.lastUpdate || "",
       repoUrl: raw.repo_url || benchmarkData?.repoUrl || "",
       preview: Boolean(globalThis.HARNESS_BENCHMARK_PREVIEW),

.github/benchmark-site/execution-data.test.cjs

@@ -68,16 +68,25 @@ test("merges manifest executions and finds a retained detail", () => {
   const history = mergeExecutionHistory(
     {
       schema_version: 2,
+      mode: "local",
       last_update: "2026-07-29T06:10:00Z",
       executions: [execution()],
     },
     { snapshots: [] },
   );
 
   assert.equal(history.executions.length, 1);
+  assert.equal(history.mode, "local");
   assert.equal(findExecution(history, "123-1").detail_path, "runs/123-1.json");
 });
 
+test("defaults execution history to published mode", () => {
+  assert.equal(
+    mergeExecutionHistory({ executions: [] }, { snapshots: [] }).mode,
+    "published",
+  );
+});
+
 test("keeps workflow attempts distinct and newest first", () => {
   const history = mergeExecutionHistory(
     {

.github/benchmark-site/execution.js

@@ -181,6 +181,7 @@
     document.title = `Run ${runLabel} · Harness E2E`;
 
     const workflowUrl = safeUrl(execution.workflow_url);
+    elements.workflowLink.hidden = !workflowUrl;
     if (workflowUrl) elements.workflowLink.href = workflowUrl;
     const commit = execution.source?.sha || "";
     const repo = history.repoUrl.replace(/\/$/, "");

.github/benchmark-site/index.html

@@ -42,15 +42,15 @@ <h1 id="page-title">Execution dashboard</h1>
           <p>Workflow-level health with scenario results and complete run diagnostics.</p>
         </div>
         <div class="sync-block">
-          <span>Last published</span>
+          <span id="sync-label">Last published</span>
           <time id="last-update" datetime="">Waiting for data</time>
         </div>
       </section>
 
       <section id="empty-state" class="empty-state" hidden>
         <div class="empty-icon" aria-hidden="true">⌁</div>
-        <h2>No executions published</h2>
-        <p>The next scheduled Harness E2E workflow will appear here.</p>
+        <h2 id="empty-title">No executions published</h2>
+        <p id="empty-description">The next scheduled Harness E2E workflow will appear here.</p>
       </section>
 
       <div id="overview-content">
@@ -212,6 +212,7 @@ <h2 id="executions-heading">All executions</h2>
                 <option value="all">All triggers</option>
                 <option value="schedule">Scheduled</option>
                 <option value="workflow_dispatch">Manual</option>
+                <option value="local">Local</option>
               </select>
             </label>
           </div>

.github/benchmark-site/overview.js

@@ -79,6 +79,8 @@
     content: document.querySelector("#overview-content"),
     count: document.querySelector("#execution-count"),
     empty: document.querySelector("#empty-state"),
+    emptyDescription: document.querySelector("#empty-description"),
+    emptyTitle: document.querySelector("#empty-title"),
     efficiencyBody: document.querySelector("#efficiency-body"),
     efficiencyCost: document.querySelector("#efficiency-cost"),
     efficiencyCostDelta: document.querySelector("#efficiency-cost-delta"),
@@ -125,6 +127,7 @@
     ),
     scenarioHistoryDialog: document.querySelector("#scenario-history-dialog"),
     scenarioHistoryTitle: document.querySelector("#scenario-history-title"),
+    syncLabel: document.querySelector("#sync-label"),
     status: document.querySelector("#status-filter"),
   };
 
@@ -1086,7 +1089,16 @@
   }
 
   async function initialize() {
-    elements.preview.hidden = !history.preview;
+    const isLocal = history.mode === "local";
+    elements.preview.hidden = !(history.preview || isLocal);
+    elements.preview.textContent = isLocal ? "Local data" : "Preview data";
+    if (isLocal) {
+      elements.syncLabel.textContent = "Last imported";
+      elements.emptyTitle.textContent = "No local executions imported";
+      elements.emptyDescription.textContent =
+        "Import a results.json file to populate this dashboard.";
+      elements.actionsLink.textContent = "View repository ↗";
+    }
     const lastUpdate = history.lastUpdate || history.executions[0]?.completed_at;
     if (lastUpdate) {
       elements.lastUpdate.dateTime = new Date(lastUpdate).toISOString();
@@ -1095,8 +1107,9 @@
     if (history.repoUrl) {
       const repo = safeUrl(history.repoUrl);
       if (repo) {
-        elements.actionsLink.href =
-          `${repo.replace(/\/$/, "")}/actions/workflows/harness-e2e-daily.yml`;
+        elements.actionsLink.href = isLocal
+          ? repo
+          : `${repo.replace(/\/$/, "")}/actions/workflows/harness-e2e-daily.yml`;
       }
     }
     elements.scenarioHistoryClose.addEventListener("click", () => {

.github/scripts/publish_harness_e2e_dashboard.py

@@ -377,9 +377,12 @@ def publish(
     repo_url: str,
     max_summaries: int,
     max_details: int,
+    site_mode: str = "published",
 ) -> dict[str, Any]:
     if max_summaries < 1 or max_details < 0 or max_details > max_summaries:
         raise PublishError("retention must satisfy 0 <= details <= summaries")
+    if site_mode not in {"local", "published"}:
+        raise PublishError("site mode must be local or published")
     site_dir.mkdir(parents=True, exist_ok=True)
     runs_dir = site_dir / "runs"
     runs_dir.mkdir(parents=True, exist_ok=True)
@@ -456,6 +459,7 @@ def publish(
 
     updated = {
         "schema_version": SCHEMA_VERSION,
+        "mode": site_mode,
         "last_update": metadata["completed_at"] or metadata["started_at"],
         "repo_url": repo_url,
         "retention": {
@@ -492,6 +496,11 @@ def build_parser() -> argparse.ArgumentParser:
     parser.add_argument("--repo-url", required=True)
     parser.add_argument("--max-summaries", type=int, default=100)
     parser.add_argument("--max-details", type=int, default=30)
+    parser.add_argument(
+        "--site-mode",
+        choices=("local", "published"),
+        default="published",
+    )
     return parser
 
 
@@ -522,6 +531,7 @@ def main(argv: list[str] | None = None) -> int:
         repo_url=args.repo_url,
         max_summaries=args.max_summaries,
         max_details=args.max_details,
+        site_mode=args.site_mode,
     )
     print(
         json.dumps(