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tests/browser/graph-aggregation-fallback-trial.ts

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+import { createRequire } from "node:module";
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { pathToFileURL } from "node:url";
+
+import { buildCommunityAggregationMarkers } from "../../packages/graph-engine/src";
+import {
+  generateLargeGraphFixture,
+  type LargeGraphFixtureMetadata
+} from "../../packages/graph-engine/test/large-graph-fixtures";
+import { buildAggregationFallbackTrialModel } from "../../packages/graph-engine/test/aggregation-fallback-trial-adapter";
+import {
+  memoryGrowthFailureClass,
+  memoryGrowthFailureDetail,
+  parseRequestedShapes,
+  validateTrialResults,
+  waitForAnimationFrames
+} from "./graph-renderer-trial-shared";
+
+const require = createRequire(import.meta.url);
+const { chromium } = require("playwright");
+
+const artifactDir = process.env.GRAPH_AGGREGATION_TRIAL_ARTIFACT_DIR || path.join(os.tmpdir(), `llm-wiki-graph-aggregation-trial-${Date.now()}`);
+const executablePath = process.env.GRAPH_AGGREGATION_TRIAL_CHROME_EXECUTABLE || "";
+const requestedShapes = parseRequestedShapes(process.env.GRAPH_AGGREGATION_TRIAL_SHAPES);
+const resultPath = path.join(artifactDir, "aggregation-fallback-trial-results.json");
+
+main().catch((error) => {
+  console.error(error);
+  process.exitCode = 1;
+});
+
+async function main(): Promise<void> {
+  await fs.mkdir(artifactDir, { recursive: true });
+  const runStartedAt = new Date().toISOString();
+  const records: PerformanceRecord[] = [];
+  const errors: string[] = [];
+  const browser = await chromium.launch(executablePath ? { executablePath } : {});
+
+  try {
+    for (const shape of requestedShapes) {
+      const fixture = generateLargeGraphFixture(shape);
+      const searchResultIds = fixture.data.nodes.filter((node) => node.label.includes("needle")).map((node) => node.id);
+      const selectedNodeIds = fixture.data.nodes.slice(0, Math.min(8, fixture.data.nodes.length)).map((node) => node.id);
+      const aggregationMarkers = buildCommunityAggregationMarkers(fixture.data, {
+        pins: fixture.pins,
+        searchResultIds,
+        selectedNodeIds,
+        minCommunitySize: 80
+      });
+      const model = buildAggregationFallbackTrialModel(fixture.data, {
+        pins: fixture.pins,
+        searchResultIds,
+        selection: selectedNodeIds[0] ? { kind: "node", id: selectedNodeIds[0] } : null,
+        aggregationMarkers
+      });
+      const html = await writeTrialHtml(shape, model);
+      try {
+        const shapeRecords = await measureShape(browser, fixture.metadata, html);
+        records.push(...shapeRecords);
+      } catch (error) {
+        errors.push(`${shape}: ${errorDetail(error)}`);
+        records.push(failedRecord(fixture.metadata, {
+          action: "fixture_load_or_action",
+          failure_class: classifyError(error),
+          failure_detail: errorDetail(error),
+          artifact_path: resultPath
+        }));
+      } finally {
+        await writeResult(runStartedAt, records, errors);
+      }
+    }
+  } finally {
+    await browser.close().catch(() => undefined);
+    await writeResult(runStartedAt, records, errors);
+  }
+
+  validateTrialResults({
+    renderer: "aggregation fallback",
+    requestedShapes,
+    records,
+    errors,
+    resultPath,
+    requireSchema: false
+  });
+  console.log(`Wrote ${records.length} aggregation fallback trial records to ${resultPath}`);
+}
+
+async function writeResult(runStartedAt: string, records: PerformanceRecord[], errors: string[]): Promise<void> {
+  await fs.writeFile(resultPath, `${JSON.stringify({
+    run_started_at: runStartedAt,
+    run_finished_at: new Date().toISOString(),
+    renderer: "aggregation-fallback-current-stack-trial",
+    candidate: {
+      new_dependency_added: false,
+      production_path_switched: false
+    },
+    artifact_dir: artifactDir,
+    shapes: requestedShapes,
+    records,
+    errors
+  }, null, 2)}\n`);
+}
+
+async function writeTrialHtml(shape: string, model: unknown): Promise<string> {
+  const file = path.join(artifactDir, `${shape}.html`);
+  await fs.writeFile(file, `<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8" />
+  <title>Aggregation Fallback Trial ${escapeHtml(shape)}</title>
+  <style>
+    html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; }
+    body { background: #f8fafc; font-family: system-ui, sans-serif; }
+    #stage { position: relative; width: 100%; height: 100%; overflow: hidden; }
+    #world { position: absolute; left: 0; top: 0; width: 100%; height: 100%; transform-origin: 0 0; }
+    svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
+    .node { position: absolute; width: 6px; height: 6px; border-radius: 999px; transform: translate(-50%, -50%); border: 0; }
+    .node[data-selected="true"] { outline: 2px solid #ef4444; }
+    .node[data-search-hit="true"] { outline: 2px solid #f59e0b; }
+    .container { position: absolute; border-radius: 999px; transform: translate(-50%, -50%); border: 1px solid rgba(15, 23, 42, 0.16); background: rgba(255,255,255,0.78); display: grid; place-items: center; font-size: 10px; color: #334155; }
+    .label { position: absolute; transform: translate(6px, -50%); font-size: 10px; color: #334155; white-space: nowrap; pointer-events: none; }
+    #drawer { position: absolute; right: 0; top: 0; width: 320px; height: 100%; background: white; border-left: 1px solid #e5e7eb; padding: 16px; box-sizing: border-box; display: none; }
+    #drawer[data-open="true"] { display: block; }
+  </style>
+</head>
+<body>
+  <div id="stage"><div id="world"><svg id="edges"></svg><div id="nodes"></div><div id="containers"></div></div></div>
+  <aside id="drawer"></aside>
+  <script>
+    const model = ${JSON.stringify(model)};
+    const nodeById = new Map(model.nodes.map((node) => [node.id, node]));
+    const containerById = new Map(model.containers.map((container) => [container.id, container]));
+    const communityById = new Map(model.communities.map((community) => [community.id, community]));
+    let scale = 1;
+    let tx = 0;
+    let ty = 0;
+    let selectedNodeId = model.nodes.find((node) => node.selected)?.id || null;
+    let selectedContainerId = null;
+    const world = document.getElementById("world");
+    const edgeRoot = document.getElementById("edges");
+    const nodeRoot = document.getElementById("nodes");
+    const containerRoot = document.getElementById("containers");
+    function bounds() {
+      const points = [...model.nodes.map((node) => [node.x, node.y]), ...model.containers.map((container) => [container.x, container.y])];
+      const xs = points.map((point) => point[0]);
+      const ys = points.map((point) => point[1]);
+      return { minX: Math.min(...xs), maxX: Math.max(...xs), minY: Math.min(...ys), maxY: Math.max(...ys) };
+    }
+    const worldBounds = bounds();
+    function px(point) {
+      const width = window.innerWidth;
+      const height = window.innerHeight;
+      const x = ((point.x - worldBounds.minX) / Math.max(1, worldBounds.maxX - worldBounds.minX)) * (width - 80) + 40;
+      const y = ((point.y - worldBounds.minY) / Math.max(1, worldBounds.maxY - worldBounds.minY)) * (height - 80) + 40;
+      return { x, y };
+    }
+    function applyCamera() {
+      world.style.transform = "translate(" + tx + "px, " + ty + "px) scale(" + scale + ")";
+    }
+    function cameraState() {
+      return { x: tx, y: ty, scale };
+    }
+    function drawInitial() {
+      const edgeParts = [];
+      for (const edge of model.edges) {
+        const source = nodeById.get(edge.source);
+        const target = nodeById.get(edge.target);
+        if (!source || !target) continue;
+        const a = px(source);
+        const b = px(target);
+        edgeParts.push('<line data-edge-id="' + edge.id + '" x1="' + a.x + '" y1="' + a.y + '" x2="' + b.x + '" y2="' + b.y + '" stroke="#94a3b8" stroke-opacity="' + edge.opacity + '" stroke-width="' + edge.strokeWidth + '" />');
+      }
+      edgeRoot.innerHTML = edgeParts.join("");
+      const nodeParts = [];
+      const labelParts = [];
+      for (const node of model.nodes) {
+        const point = px(node);
+        nodeParts.push('<button class="node" data-node-id="' + node.id + '" data-selected="' + node.selected + '" data-search-hit="' + node.searchHit + '" style="left:' + point.x + 'px;top:' + point.y + 'px;width:' + (node.radius * 2) + 'px;height:' + (node.radius * 2) + 'px;background:' + node.color + '"></button>');
+        if (node.labelVisible) labelParts.push('<span class="label" data-label-node-id="' + node.id + '" style="left:' + point.x + 'px;top:' + point.y + 'px">' + escapeHtmlClient(node.label) + '</span>');
+      }
+      nodeRoot.innerHTML = nodeParts.join("") + labelParts.join("");
+      const containerParts = [];
+      for (const container of model.containers) {
+        const point = px(container);
+        const size = Math.max(18, container.radius * 2);
+        containerParts.push('<button class="container" data-container-id="' + container.id + '" style="left:' + point.x + 'px;top:' + point.y + 'px;width:' + size + 'px;height:' + size + 'px;border-color:' + container.color + '">' + container.totalCount + '</button>');
+      }
+      containerRoot.innerHTML = containerParts.join("");
+      applyCamera();
+    }
+    function escapeHtmlClient(value) {
+      return String(value).replace(/[&<>"']/g, (char) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[char] || char));
+    }
+    function searchHighlight(query) {
+      const normalized = String(query || "").toLowerCase();
+      let hits = 0;
+      for (const node of model.nodes) {
+        const hit = normalized && node.label.toLowerCase().includes(normalized);
+        if (hit) hits += 1;
+        const element = document.querySelector('[data-node-id="' + node.id + '"]');
+        if (element) element.dataset.searchHit = String(Boolean(hit));
+      }
+      return { hits };
+    }
+    function pointSelect(id) {
+      if (!nodeById.has(id)) return { selectedNodeId: null };
+      if (selectedNodeId) {
+        const previous = document.querySelector('[data-node-id="' + selectedNodeId + '"]');
+        if (previous) previous.dataset.selected = "false";
+      }
+      selectedNodeId = id;
+      const element = document.querySelector('[data-node-id="' + id + '"]');
+      if (element) element.dataset.selected = "true";
+      return { selectedNodeId: id };
+    }
+    function containerSelect(id) {
+      const container = containerById.get(id);
+      const community = communityById.get(id);
+      const nodeIds = container?.nodeIds || community?.nodeIds || [];
+      selectedContainerId = id;
+      return { selectedContainerId: id, nodeCount: nodeIds.length };
+    }
+    function openDrawer() {
+      const drawer = document.getElementById("drawer");
+      drawer.dataset.open = "true";
+      drawer.textContent = selectedContainerId
+        ? "container:" + selectedContainerId
+        : selectedNodeId
+          ? "node:" + selectedNodeId
+          : "global";
+      return { open: true, text: drawer.textContent };
+    }
+    function enterCommunity(id) {
+      return containerSelect(id);
+    }
+    function returnGlobal() {
+      scale = 1;
+      tx = 0;
+      ty = 0;
+      selectedContainerId = null;
+      applyCamera();
+      return { camera: cameraState() };
+    }
+    function panBy(dx, dy) {
+      tx += dx;
+      ty += dy;
+      applyCamera();
+      return cameraState();
+    }
+    function zoomBy(factor) {
+      scale *= factor;
+      applyCamera();
+      return cameraState();
+    }
+    drawInitial();
+    window.__aggregationTrial = {
+      ready: true,
+      model,
+      cameraState,
+      searchHighlight,
+      pointSelect,
+      containerSelect,
+      openDrawer,
+      enterCommunity,
+      returnGlobal,
+      panBy,
+      zoomBy,
+      firstNodeId: model.nodes[0]?.id || null,
+      firstCommunityId: model.communities[0]?.id || null,
+      firstContainerId: model.containers[0]?.id || model.communities[0]?.id || null,
+      counts() {
+        return {
+          nodes: model.nodes.length,
+          edges: model.edges.length,
+          communities: model.communities.length,
+          containers: model.containers.length,
+          labels: document.querySelectorAll(".label").length,
+          cards: model.budget.visibleCards,
+          selectedNodeId,
+          selectedContainerId,
+          camera: cameraState(),
+          budget: model.budget
+        };
+      }
+    };
+  </script>
+</body>
+</html>
+`);
+  return file;
+}
+
+async function measureShape(browser: BrowserLike, metadata: LargeGraphFixtureMetadata, html: string): Promise<PerformanceRecord[]> {
+  const page = await browser.newPage({ viewport: { width: 1440, height: 960 } });
+  page.setDefaultTimeout(timeoutFor(metadata));
+  page.setDefaultNavigationTimeout(45_000);
+  const records: PerformanceRecord[] = [];
+  try {
+    const renderStarted = performance.now();
+    await page.goto(pathToFileURL(html).href, { waitUntil: "domcontentloaded", timeout: navigationTimeoutFor(metadata) });
+    await page.waitForFunction(() => Boolean((window as any).__aggregationTrial?.ready));
+    records.push(await recordFromPage(page, metadata, {
+      action: "initial_render",
+      duration_ms: performance.now() - renderStarted,
+      pass: true,
+      artifact_path: resultPath
+    }));
+    for (const action of [
+      () => measureWheelZoom(page, metadata),
+      () => measurePan(page, metadata),
+      () => measureSearch(page, metadata),
+      () => measurePointSelect(page, metadata),
+      () => measureContainerSelect(page, metadata),
+      () => measureDrawerOpen(page, metadata),
+      () => measureEnterCommunity(page, metadata),
+      () => measureReturnGlobal(page, metadata)
+    ]) {
+      records.push(await safeMeasure(page, metadata, action));
+    }
+    records.push(await safeMeasure(page, metadata, () => measureRepeatedCycles(page, metadata)));
+  } finally {
+    await page.close().catch(() => undefined);
+  }
+  return records;
+}
+
+async function safeMeasure(page: PageLike, metadata: LargeGraphFixtureMetadata, action: () => Promise<PerformanceRecord>): Promise<PerformanceRecord> {
+  try {
+    return await action();
+  } catch (error) {
+    return failedRecord(metadata, {
+      action: inferActionName(error),
+      failure_class: classifyError(error),
+      failure_detail: errorDetail(error),
+      artifact_path: resultPath
+    });
+  }
+}
+
+async function measureWheelZoom(page: PageLike, metadata: LargeGraphFixtureMetadata): Promise<PerformanceRecord> {
+  const before = await cameraState(page);
+  const samplePromise = sampleAnimationFrames(page, 1000);
+  const started = performance.now();
+  while (performance.now() - started < 1000) {
+    await page.evaluate(() => (window as any).__aggregationTrial.zoomBy(1.04));
+    await page.waitForTimeout(50);
+  }
+  await waitForAnimationFrames(page);
+  const sample = await samplePromise;
+  const after = await cameraState(page);
+  const changed = JSON.stringify(after) !== JSON.stringify(before);
+  return recordFromPage(page, metadata, {
+    action: "wheel_zoom",
+    duration_ms: sample.durationMs,
+    fps: sample.fps,
+    frame_p95_ms: sample.p95,
+    pass: changed && sample.fps >= 10,
+    failure_class: changed ? (sample.fps < 10 ? "fps_below_floor" : null) : "camera_unchanged",
+    artifact_path: resultPath
+  });
+}
+
+async function measurePan(page: PageLike, metadata: LargeGraphFixtureMetadata): Promise<PerformanceRecord> {
+  const before = await cameraState(page);
+  const started = performance.now();
+  await page.evaluate(() => (window as any).__aggregationTrial.panBy(180, 140));
+  await waitForAnimationFrames(page);
+  const after = await cameraState(page);
+  return recordFromPage(page, metadata, {
+    action: "pan",
+    duration_ms: performance.now() - started,
+    pass: JSON.stringify(after) !== JSON.stringify(before),
+    failure_class: JSON.stringify(after) === JSON.stringify(before) ? "camera_unchanged" : null,
+    artifact_path: resultPath
+  });
+}
+
+async function measureSearch(page: PageLike, metadata: LargeGraphFixtureMetadata): Promise<PerformanceRecord> {
+  const started = performance.now();
+  const result = await page.evaluate(() => (window as any).__aggregationTrial.searchHighlight("needle"));
+  await waitForAnimationFrames(page);
+  const hits = (result as { hits: number }).hits;
+  return recordFromPage(page, metadata, {
+    action: "search_highlight",
+    duration_ms: performance.now() - started,
+    pass: hits === metadata.search_hits,
+    failure_class: hits === metadata.search_hits ? null : "search_hit_mismatch",
+    failure_detail: hits === metadata.search_hits ? null : `expected=${metadata.search_hits}; actual=${hits}`,
+    artifact_path: resultPath
+  });
+}
+
+async function measurePointSelect(page: PageLike, metadata: LargeGraphFixtureMetadata): Promise<PerformanceRecord> {
+  const started = performance.now();
+  const result = await page.evaluate(() => {
+    const trial = (window as any).__aggregationTrial;
+    return trial.pointSelect(trial.firstNodeId);
+  });
+  await waitForAnimationFrames(page);
+  const counts = await page.evaluate(() => (window as any).__aggregationTrial.counts());
+  const expected = (result as { selectedNodeId: string | null }).selectedNodeId;
+  const actual = (counts as { selectedNodeId: string | null }).selectedNodeId;
+  return recordFromPage(page, metadata, {
+    action: "point_select",
+    duration_ms: performance.now() - started,
+    pass: Boolean(expected) && actual === expected,
+    failure_class: Boolean(expected) && actual === expected ? null : "selected_node_mismatch",
+    failure_detail: Boolean(expected) && actual === expected ? null : `expected=${expected ?? "null"}; actual=${actual ?? "null"}`,
+    artifact_path: resultPath
+  });
+}
+
+async function measureContainerSelect(page: PageLike, metadata: LargeGraphFixtureMetadata): Promise<PerformanceRecord> {
+  const started = performance.now();
+  const result = await page.evaluate(() => {
+    const trial = (window as any).__aggregationTrial;
+    return trial.containerSelect(trial.firstContainerId);
+  });
+  await waitForAnimationFrames(page);
+  const counts = await page.evaluate(() => (window as any).__aggregationTrial.counts());
+  const expected = (result as { selectedContainerId: string | null }).selectedContainerId;
+  const actual = (counts as { selectedContainerId: string | null }).selectedContainerId;
+  return recordFromPage(page, metadata, {
+    action: "container_select",
+    duration_ms: performance.now() - started,
+    pass: Boolean(expected) && actual === expected,
+    failure_class: Boolean(expected) && actual === expected ? null : "selected_container_mismatch",
+    failure_detail: Boolean(expected) && actual === expected ? null : `expected=${expected ?? "null"}; actual=${actual ?? "null"}`,
+    artifact_path: resultPath
+  });
+}
+
+async function measureDrawerOpen(page: PageLike, metadata: LargeGraphFixtureMetadata): Promise<PerformanceRecord> {
+  const started = performance.now();
+  const result = await page.evaluate(() => (window as any).__aggregationTrial.openDrawer());
+  await waitForAnimationFrames(page);
+  const opened = Boolean((result as { open: boolean; text?: string }).open);
+  const text = (result as { open: boolean; text?: string }).text || "";
+  return recordFromPage(page, metadata, {
+    action: "drawer_open",
+    duration_ms: performance.now() - started,
+    pass: opened && /^(container|node|global)/.test(text),
+    failure_class: opened && /^(container|node|global)/.test(text) ? null : "drawer_not_opened",
+    failure_detail: opened && /^(container|node|global)/.test(text) ? null : `text=${text || "empty"}`,
+    artifact_path: resultPath
+  });
+}
+
+async function measureEnterCommunity(page: PageLike, metadata: LargeGraphFixtureMetadata): Promise<PerformanceRecord> {
+  const started = performance.now();
+  const result = await page.evaluate(() => {
+    const trial = (window as any).__aggregationTrial;
+    return trial.enterCommunity(trial.firstCommunityId);
+  });
+  await waitForAnimationFrames(page);
+  const counts = await page.evaluate(() => (window as any).__aggregationTrial.counts());
+  const expected = (result as { selectedContainerId: string | null }).selectedContainerId;
+  const actual = (counts as { selectedContainerId: string | null }).selectedContainerId;
+  return recordFromPage(page, metadata, {
+    action: "enter_community",
+    duration_ms: performance.now() - started,
+    pass: Boolean(expected) && actual === expected,
+    failure_class: Boolean(expected) && actual === expected ? null : "community_selection_mismatch",
+    failure_detail: Boolean(expected) && actual === expected ? null : `expected=${expected ?? "null"}; actual=${actual ?? "null"}`,
+    artifact_path: resultPath
+  });
+}
+
+async function measureReturnGlobal(page: PageLike, metadata: LargeGraphFixtureMetadata): Promise<PerformanceRecord> {
+  const started = performance.now();
+  await page.evaluate(() => (window as any).__aggregationTrial.returnGlobal());
+  await waitForAnimationFrames(page);
+  const counts = await page.evaluate(() => (window as any).__aggregationTrial.counts());
+  const selectedContainerId = (counts as { selectedContainerId: string | null }).selectedContainerId;
+  return recordFromPage(page, metadata, {
+    action: "return_global",
+    duration_ms: performance.now() - started,
+    pass: selectedContainerId == null,
+    failure_class: selectedContainerId == null ? null : "global_return_incomplete",
+    failure_detail: selectedContainerId == null ? null : `selectedContainerId=${selectedContainerId}`,
+    artifact_path: resultPath
+  });
+}
+
+async function measureRepeatedCycles(page: PageLike, metadata: LargeGraphFixtureMetadata): Promise<PerformanceRecord> {
+  const before = await memoryMb(page);
+  const started = performance.now();
+  for (let index = 0; index < 2; index += 1) {
+    await page.evaluate(() => {
+      const trial = (window as any).__aggregationTrial;
+      trial.searchHighlight("needle");
+      trial.pointSelect(trial.firstNodeId);
+      trial.containerSelect(trial.firstContainerId);
+      trial.openDrawer();
+      trial.returnGlobal();
+    });
+    await waitForAnimationFrames(page, 2);
+  }
+  const after = await memoryMb(page);
+  const memoryGrowth = before == null || after == null ? null : round(after - before);
+  const failureClass = memoryGrowthFailureClass(memoryGrowth, metadata);
+  const record = await recordFromPage(page, metadata, {
+    action: "repeated_search_community_drawer_cycles",
+    duration_ms: performance.now() - started,
+    pass: failureClass == null,
+    failure_class: failureClass,
+    failure_detail: memoryGrowthFailureDetail(memoryGrowth, metadata),
+    artifact_path: resultPath
+  });
+  record.memory_after_cycles_mb = after;
+  record.memory_growth_mb = memoryGrowth;
+  return record;
+}
+
+async function recordFromPage(
+  page: PageLike,
+  metadata: LargeGraphFixtureMetadata,
+  input: Partial<PerformanceRecord> & { action: string; artifact_path: string }
+): Promise<PerformanceRecord> {
+  const counts = await page.evaluate(() => {
+    const trial = (window as any).__aggregationTrial;
+    const trialCounts = trial?.counts?.() ?? {};
+    const budget = trialCounts.budget ?? {};
+    return {
+      dom_node_count: document.querySelectorAll("*").length,
+      visible_node_count: trialCounts.nodes ?? null,
+      visible_edge_count: trialCounts.edges ?? null,
+      visible_label_count: trialCounts.labels ?? null,
+      visible_card_count: trialCounts.cards ?? null,
+      memory_peak_mb: typeof performance !== "undefined" && "memory" in performance
+        ? Math.round((((performance as any).memory?.usedJSHeapSize || 0) / 1024 / 1024) * 10) / 10
+        : null,
+      long_task_count: performance.getEntriesByType ? performance.getEntriesByType("longtask").length : null,
+      interaction_mode: "aggregation-fallback",
+      interaction_updated_objects: budget.interactionUpdatedObjects ?? null,
+      interaction_hidden_objects: budget.interactionHiddenObjects ?? null,
+      interaction_preserved_nodes: Array.isArray(budget.preservedNodeIds) ? budget.preservedNodeIds.length : null,
+      interaction_max_updates: budget.maxInteractionUpdates ?? null
+    };
+  });
+  return {
+    ...baseRecord(metadata, input.action, input.artifact_path),
+    ...counts,
+    duration_ms: round(input.duration_ms ?? 0),
+    fps: input.fps == null ? null : round(input.fps),
+    frame_p95_ms: input.frame_p95_ms == null ? null : round(input.frame_p95_ms),
+    pass: input.pass ?? true,
+    failure_class: input.failure_class ?? null,
+    failure_detail: input.failure_detail ?? null
+  };
+}
+
+function failedRecord(
+  metadata: LargeGraphFixtureMetadata,
+  input: { action: string; failure_class: string; failure_detail?: string; artifact_path: string }
+): PerformanceRecord {
+  return {
+    ...baseRecord(metadata, input.action, input.artifact_path),
+    failure_class: input.failure_class,
+    failure_detail: input.failure_detail ?? null
+  };
+}
+
+function baseRecord(metadata: LargeGraphFixtureMetadata, action: string, artifactPath: string): PerformanceRecord {
+  return {
+    phase: "phase-6",
+    task: "6.3",
+    renderer: "aggregation-fallback-current-stack-trial",
+    graph_shape: metadata.id,
+    nodes: metadata.nodes,
+    edges: metadata.edges,
+    communities: metadata.communities,
+    largest_community: metadata.largest_community,
+    largest_connected_density: metadata.largest_connected_density,
+    search_hits: metadata.search_hits,
+    pin_count: metadata.pin_count,
+    oversized_community: metadata.oversized_community,
+    action,
+    duration_ms: null,
+    fps: null,
+    frame_p95_ms: null,
+    long_task_count: null,
+    dom_node_count: null,
+    visible_node_count: null,
+    visible_edge_count: null,
+    visible_label_count: null,
+    visible_card_count: null,
+    interaction_mode: null,
+    interaction_updated_objects: null,
+    interaction_hidden_objects: null,
+    interaction_preserved_nodes: null,
+    interaction_max_updates: null,
+    memory_peak_mb: null,
+    memory_after_cycles_mb: null,
+    memory_growth_mb: null,
+    pass: false,
+    failure_class: null,
+    failure_detail: null,
+    artifact_path: artifactPath,
+    measured_at: new Date().toISOString()
+  };
+}
+
+async function cameraState(page: PageLike): Promise<unknown> {
+  return page.evaluate(() => (window as any).__aggregationTrial.cameraState());
+}
+
+async function memoryMb(page: PageLike): Promise<number | null> {
+  return page.evaluate(() => {
+    if (typeof performance === "undefined" || !("memory" in performance)) return null;
+    const used = (performance as any).memory?.usedJSHeapSize;
+    return typeof used === "number" ? Math.round((used / 1024 / 1024) * 10) / 10 : null;
+  });
+}
+
+async function sampleAnimationFrames(page: PageLike, durationMs: number): Promise<{ durationMs: number; fps: number; p95: number }> {
+  return page.evaluate(`(() => new Promise((resolve) => {
+    const durationMs = ${JSON.stringify(durationMs)};
+    const started = performance.now();
+    const deltas = [];
+    let last = started;
+    function tick(now) {
+      deltas.push(now - last);
+      last = now;
+      const elapsed = now - started;
+      if (elapsed >= durationMs) {
+        const sorted = [...deltas].sort((a, b) => a - b);
+        const p95 = sorted[Math.max(0, Math.floor(sorted.length * 0.95) - 1)] || 0;
+        resolve({ durationMs: elapsed, fps: deltas.length / (elapsed / 1000), p95 });
+        return;
+      }
+      requestAnimationFrame(tick);
+    }
+    requestAnimationFrame(tick);
+  }))()`) as Promise<{ durationMs: number; fps: number; p95: number }>;
+}
+
+function classifyError(error: unknown): string {
+  const message = error instanceof Error ? error.message : String(error);
+  if (/Timeout/i.test(message)) return "timeout";
+  if (/Target page|browser has been closed/i.test(message)) return "browser_closed";
+  if (/JavaScript heap|out of memory/i.test(message)) return "memory";
+  return "exception";
+}
+
+function errorDetail(error: unknown): string {
+  const message = error instanceof Error ? error.message : String(error);
+  return message.replace(/\s+/g, " ").slice(0, 500);
+}
+
+function inferActionName(error: unknown): string {
+  const stack = error instanceof Error ? error.stack || error.message : String(error);
+  const match = stack.match(/measure[A-Z][A-Za-z0-9_]*/);
+  if (!match) return "unknown_action";
+  return match[0].replace(/^measure/, "").replace(/([a-z0-9])([A-Z])/g, "$1_$2").toLowerCase();
+}
+
+function timeoutFor(metadata: LargeGraphFixtureMetadata): number {
+  if (metadata.nodes >= 10000) return 25_000;
+  if (metadata.nodes >= 5000) return 18_000;
+  return 12_000;
+}
+
+function navigationTimeoutFor(metadata: LargeGraphFixtureMetadata): number {
+  if (metadata.nodes >= 10000) return 45_000;
+  if (metadata.nodes >= 5000) return 30_000;
+  return 20_000;
+}
+
+function round(value: number): number {
+  return Math.round(value * 10) / 10;
+}
+
+function escapeHtml(value: string): string {
+  return value.replace(/[&<>"']/g, (char) => ({
+    "&": "&amp;",
+    "<": "&lt;",
+    ">": "&gt;",
+    '"': "&quot;",
+    "'": "&#39;"
+  }[char] ?? char));
+}
+
+interface BrowserLike {
+  newPage(options: { viewport: { width: number; height: number } }): Promise<PageLike>;
+  close(): Promise<void>;
+}
+
+interface PageLike {
+  setDefaultTimeout(timeout: number): void;
+  setDefaultNavigationTimeout(timeout: number): void;
+  goto(url: string, options?: unknown): Promise<unknown>;
+  waitForFunction(fn: Function | string, arg?: unknown, options?: unknown): Promise<unknown>;
+  waitForTimeout(timeout: number): Promise<void>;
+  evaluate<T>(fn: Function | string, arg?: unknown): Promise<T>;
+  close(): Promise<void>;
+}
+
+interface PerformanceRecord {
+  phase: string;
+  task: string;
+  renderer: string;
+  graph_shape: string;
+  nodes: number;
+  edges: number;
+  communities: number;
+  largest_community: number;
+  largest_connected_density: number;
+  search_hits: number;
+  pin_count: number;
+  oversized_community: boolean;
+  action: string;
+  duration_ms: number | null;
+  fps: number | null;
+  frame_p95_ms: number | null;
+  long_task_count: number | null;
+  dom_node_count: number | null;
+  visible_node_count: number | null;
+  visible_edge_count: number | null;
+  visible_label_count: number | null;
+  visible_card_count: number | null;
+  interaction_mode: string | null;
+  interaction_updated_objects: number | null;
+  interaction_hidden_objects: number | null;
+  interaction_preserved_nodes: number | null;
+  interaction_max_updates: number | null;
+  memory_peak_mb: number | null;
+  memory_after_cycles_mb: number | null;
+  memory_growth_mb: number | null;
+  pass: boolean;
+  failure_class: string | null;
+  failure_detail?: string | null;
+  artifact_path: string;
+  measured_at: string;
+}