diff --git a/plots/circlepacking-basic/implementations/javascript/highcharts.js b/plots/circlepacking-basic/implementations/javascript/highcharts.js
new file mode 100644
index 0000000000..63cf640e5b
--- /dev/null
+++ b/plots/circlepacking-basic/implementations/javascript/highcharts.js
@@ -0,0 +1,336 @@
+// anyplot.ai
+// circlepacking-basic: Circle Packing Chart
+// Library: highcharts 12.6.0 | JavaScript 22.23.2
+// Quality: 89/100 | Created: 2026-09-02
+//# anyplot-orientation: square
+
+// Highcharts' packed-bubble / circle-packing series lives in the
+// highcharts-more add-on module, which is not vendored here — only the core
+// bundle (with its SVGRenderer) is loaded. So the hierarchy below is packed
+// with a small deterministic relaxation algorithm (index-seeded, no RNG) and
+// drawn natively with `chart.renderer`: a root ring, one ring per directory,
+// and (for one directory) a nested sub-ring for its files, three levels deep.
+// The same recursive layout/render pair handles every level. No other
+// charting library is used.
+
+const t = window.ANYPLOT_TOKENS;
+
+// --- Data: a small repository's directory sizes (KB), up to 3 levels deep ----
+// Most directories hold files directly (2 levels below root); "components/"
+// is further split into named files to exercise a 3rd nesting level.
+const CATEGORIES = [
+  {
+    id: "src",
+    label: "src/",
+    children: [
+      {
+        id: "src-components",
+        label: "components/",
+        children: [
+          { id: "src-components-table", label: "Table.jsx", value: 150 },
+          { id: "src-components-modal", label: "Modal.jsx", value: 130 },
+          { id: "src-components-form", label: "Form.jsx", value: 120 },
+          { id: "src-components-button", label: "Button.jsx", value: 80 },
+        ],
+      },
+      { id: "src-api", label: "api.js", value: 340 },
+      { id: "src-store", label: "store.js", value: 210 },
+      { id: "src-utils", label: "utils.js", value: 120 },
+      { id: "src-hooks", label: "hooks.js", value: 95 },
+      { id: "src-styles", label: "styles.css", value: 70 },
+      { id: "src-types", label: "types.d.ts", value: 55 },
+    ],
+  },
+  {
+    id: "tests",
+    label: "tests/",
+    children: [
+      { id: "tests-unit", label: "unit/", value: 200 },
+      { id: "tests-integration", label: "integration/", value: 150 },
+      { id: "tests-e2e", label: "e2e/", value: 90 },
+      { id: "tests-fixtures", label: "fixtures/", value: 60 },
+      { id: "tests-mocks", label: "mocks/", value: 45 },
+    ],
+  },
+  {
+    id: "docs",
+    label: "docs/",
+    children: [
+      { id: "docs-api", label: "api-reference.md", value: 130 },
+      { id: "docs-guide", label: "guide.md", value: 85 },
+      { id: "docs-changelog", label: "changelog.md", value: 50 },
+      { id: "docs-readme", label: "readme.md", value: 45 },
+    ],
+  },
+  {
+    id: "assets",
+    label: "assets/",
+    children: [
+      { id: "assets-images", label: "images/", value: 380 },
+      { id: "assets-fonts", label: "fonts/", value: 190 },
+      { id: "assets-videos", label: "videos/", value: 140 },
+      { id: "assets-icons", label: "icons/", value: 95 },
+      { id: "assets-logo", label: "logo.svg", value: 40 },
+    ],
+  },
+  {
+    id: "build",
+    label: "build/",
+    children: [
+      { id: "build-bundle", label: "bundle.js", value: 600 },
+      { id: "build-vendor", label: "vendor.js", value: 420 },
+      { id: "build-maps", label: "sourcemaps/", value: 210 },
+      { id: "build-manifest", label: "manifest.json", value: 45 },
+    ],
+  },
+];
+
+// Directories are abstract categories, so the Imprint palette is used in
+// canonical order — src = brand green (palette[0]).
+const categoryColor = (i) => t.palette[i % t.palette.length];
+
+const formatSize = (kb) => (kb >= 1000 ? `${(kb / 1000).toFixed(1)} MB` : `${kb} KB`);
+
+function hexToRgba(hex, alpha) {
+  const r = parseInt(hex.slice(1, 3), 16);
+  const g = parseInt(hex.slice(3, 5), 16);
+  const b = parseInt(hex.slice(5, 7), 16);
+  return `rgba(${r}, ${g}, ${b}, ${alpha})`;
+}
+
+// Pick readable label ink by the fill's own luminance rather than the active
+// theme — a leaf circle's colour is the same in light and dark mode, so the
+// text riding on top needs the ink value with contrast to THAT colour, not to
+// the page. #1A1A17 / #F0EFE8 are exactly the light/dark INK tokens reused
+// for this purpose, never a new custom hex.
+function contrastInk(hex) {
+  const r = parseInt(hex.slice(1, 3), 16) / 255;
+  const g = parseInt(hex.slice(3, 5), 16) / 255;
+  const b = parseInt(hex.slice(5, 7), 16) / 255;
+  const lin = (v) => (v <= 0.04045 ? v / 12.92 : ((v + 0.055) / 1.055) ** 2.4);
+  const luminance = 0.2126 * lin(r) + 0.7152 * lin(g) + 0.0722 * lin(b);
+  return luminance > 0.42 ? "#1A1A17" : "#F0EFE8";
+}
+
+// --- Circle packing: a small deterministic relaxation, applied per level -----
+// Seed circles on a ring (index-based angle, no RNG), then repeatedly resolve
+// overlaps and pull toward the centroid until the group settles into a tight,
+// non-overlapping cluster. The same routine packs siblings at every depth —
+// files within a directory, a directory alongside files within its parent,
+// and top-level directories within the repository.
+function packCircles(items, gap) {
+  if (items.length === 0) return { placed: [], boundingRadius: 0 };
+  if (items.length === 1) {
+    return { placed: [{ id: items[0].id, x: 0, y: 0, r: items[0].r }], boundingRadius: items[0].r };
+  }
+  const n = items.length;
+  const nodes = items.map((it, i) => {
+    const theta = (i / n) * Math.PI * 2;
+    const seedR = it.r * 1.6 + i * 4;
+    return { id: it.id, r: it.r, x: seedR * Math.cos(theta), y: seedR * Math.sin(theta) };
+  });
+  for (let iter = 0; iter < 260; iter += 1) {
+    nodes.forEach((a) => {
+      a.x -= a.x * 0.02;
+      a.y -= a.y * 0.02;
+    });
+    for (let i = 0; i < n; i += 1) {
+      for (let j = i + 1; j < n; j += 1) {
+        const a = nodes[i];
+        const b = nodes[j];
+        let dx = b.x - a.x;
+        let dy = b.y - a.y;
+        let dist = Math.sqrt(dx * dx + dy * dy);
+        const minDist = a.r + b.r + gap;
+        if (dist < 1e-6) {
+          dx = 0.01 * (i + 1);
+          dy = 0.01 * (j + 1);
+          dist = Math.sqrt(dx * dx + dy * dy);
+        }
+        if (dist < minDist) {
+          const overlap = (minDist - dist) / 2;
+          const ux = dx / dist;
+          const uy = dy / dist;
+          a.x -= ux * overlap;
+          a.y -= uy * overlap;
+          b.x += ux * overlap;
+          b.y += uy * overlap;
+        }
+      }
+    }
+  }
+  const minX = Math.min(...nodes.map((nd) => nd.x - nd.r));
+  const maxX = Math.max(...nodes.map((nd) => nd.x + nd.r));
+  const minY = Math.min(...nodes.map((nd) => nd.y - nd.r));
+  const maxY = Math.max(...nodes.map((nd) => nd.y + nd.r));
+  const ox = (minX + maxX) / 2;
+  const oy = (minY + maxY) / 2;
+  nodes.forEach((nd) => {
+    nd.x -= ox;
+    nd.y -= oy;
+  });
+  let boundingRadius = 0;
+  nodes.forEach((nd) => {
+    const d = Math.sqrt(nd.x * nd.x + nd.y * nd.y) + nd.r;
+    if (d > boundingRadius) boundingRadius = d;
+  });
+  return { placed: nodes, boundingRadius };
+}
+
+// --- Layout: a recursive pack, depth 0 = root, 1 = category, 2+ = nested ----
+// Circle area, not radius, encodes size: radius = sqrt(value) in abstract
+// units; everything is rescaled to pixels once the final plot area is known.
+// Every node below the root inherits its top-level category's colour index,
+// so a nested sub-directory (e.g. "components/") reads as part of "src/".
+const LEAF_GAP = 1.4;
+const RING_PADDING = 6.5;
+const CATEGORY_GAP = 7;
+const ROOT_PADDING = 7;
+
+const leafRadius = (value) => Math.sqrt(value);
+
+function layoutNode(node, depth, categoryIndex) {
+  if (!node.children) {
+    return { id: node.id, label: node.label, value: node.value, r: leafRadius(node.value), depth, categoryIndex, leaf: true };
+  }
+  const childLayouts = node.children.map((child, i) => layoutNode(child, depth + 1, depth === 0 ? i : categoryIndex));
+  const gap = depth === 0 ? CATEGORY_GAP : LEAF_GAP;
+  const { placed, boundingRadius } = packCircles(
+    childLayouts.map((cl) => ({ id: cl.id, r: cl.r })),
+    gap,
+  );
+  const totalValue = childLayouts.reduce((s, cl) => s + cl.value, 0);
+  const children = childLayouts.map((cl) => {
+    const p = placed.find((pp) => pp.id === cl.id);
+    return { ...cl, x: p.x, y: p.y };
+  });
+  // Padding shrinks with depth so nested rings hug their contents a little
+  // tighter than the outer category rings do.
+  const padding = depth === 0 ? ROOT_PADDING : depth === 1 ? RING_PADDING : RING_PADDING * 0.7;
+  return {
+    id: node.id,
+    label: node.label,
+    value: totalValue,
+    r: boundingRadius + padding,
+    depth,
+    categoryIndex,
+    leaf: false,
+    children,
+  };
+}
+
+const tree = layoutNode({ id: "root", label: "repository", children: CATEGORIES }, 0, null);
+
+// --- Chart shell (no series — every circle is drawn with the renderer) -------
+const chart = Highcharts.chart("container", {
+  chart: {
+    backgroundColor: "transparent",
+    animation: false,
+    style: { fontFamily: "inherit" },
+    marginTop: 100,
+    marginBottom: 40,
+    marginLeft: 40,
+    marginRight: 40,
+  },
+  credits: { enabled: false },
+  colors: t.palette,
+  title: {
+    text: "circlepacking-basic · javascript · highcharts · anyplot.ai",
+    style: { color: t.ink, fontSize: "22px", fontWeight: "600" },
+  },
+  subtitle: {
+    text: "Repository directory sizes — circle area = file/folder size (KB), colour = directory",
+    style: { color: t.inkSoft, fontSize: "14px" },
+  },
+  xAxis: { visible: false },
+  yAxis: { visible: false },
+  legend: { enabled: false },
+  plotOptions: { series: { animation: false } },
+  series: [],
+});
+
+const cx = chart.plotLeft + chart.plotWidth / 2;
+const cy = chart.plotTop + chart.plotHeight / 2;
+const radiusMax = Math.min(chart.plotWidth, chart.plotHeight) / 2;
+const finalScale = (radiusMax - 12) / tree.r;
+const px = (x) => cx + x * finalScale;
+const py = (y) => cy + y * finalScale;
+const pr = (r) => r * finalScale;
+
+function addTitle(el, text) {
+  const title = document.createElementNS("http://www.w3.org/2000/svg", "title");
+  title.textContent = text;
+  el.element.appendChild(title);
+}
+
+const g = chart.renderer.g("circle-packing").add();
+
+// --- Render: recursive, depth drives stroke weight / fill alpha / labels ----
+// depth 0 = root outline, depth 1 = category ring, depth 2+ = nested rings
+// (subtly thinner stroke, higher fill alpha) or solid leaf circles.
+function renderNode(node, parentX, parentY, pathPrefix) {
+  const x = px(parentX + (node.x ?? 0));
+  const y = py(parentY + (node.y ?? 0));
+  const r = pr(node.r);
+
+  if (node.leaf) {
+    const color = categoryColor(node.categoryIndex);
+    const leaf = chart.renderer
+      .circle(x, y, r)
+      .attr({ fill: color, stroke: t.pageBg, "stroke-width": 1.5 })
+      .add(g);
+    addTitle(leaf, `${pathPrefix}${node.label} — ${formatSize(node.value)}`);
+
+    if (r >= 28) {
+      const fontSize = Math.max(10, Math.min(13, Math.round(r * 0.26)));
+      const maxChars = Math.max(3, Math.floor((r * 1.7) / (fontSize * 0.58)));
+      const text = node.label.length > maxChars ? `${node.label.slice(0, maxChars - 1)}…` : node.label;
+      chart.renderer
+        .text(text, x, y + fontSize * 0.35)
+        .attr({ align: "center" })
+        .css({ color: contrastInk(color), fontSize: `${fontSize}px`, fontWeight: "500" })
+        .add(g);
+    }
+    return;
+  }
+
+  if (node.depth === 0) {
+    const root = chart.renderer
+      .circle(x, y, r)
+      .attr({ fill: "transparent", stroke: t.grid, "stroke-width": 1.5 })
+      .add(g);
+    addTitle(root, `repository — ${formatSize(node.value)} total`);
+  } else {
+    const isCategory = node.depth === 1;
+    const color = categoryColor(node.categoryIndex);
+    const ring = chart.renderer
+      .circle(x, y, r)
+      .attr({
+        fill: hexToRgba(color, isCategory ? 0.1 : 0.17),
+        stroke: color,
+        "stroke-width": isCategory ? 2.5 : 1.8,
+      })
+      .add(g);
+    addTitle(ring, `${pathPrefix}${node.label} — ${formatSize(node.value)} total`);
+
+    const labelThreshold = isCategory ? 55 : 40;
+    if (r >= labelThreshold) {
+      const fontSize = isCategory ? Math.max(12, Math.min(16, Math.round(r * 0.1))) : Math.max(11, Math.min(13, Math.round(r * 0.12)));
+      chart.renderer
+        .text(`${node.label} · ${formatSize(node.value)}`, x, y - r + fontSize + 6)
+        .attr({ align: "center" })
+        .css({ color: t.ink, fontSize: `${fontSize}px`, fontWeight: "600" })
+        .add(g);
+    }
+  }
+
+  const childPathPrefix = node.depth === 0 ? "" : `${pathPrefix}${node.label}`;
+  const originX = parentX + (node.x ?? 0);
+  const originY = parentY + (node.y ?? 0);
+  node.children.forEach((child) => renderNode(child, originX, originY, childPathPrefix));
+}
+
+renderNode(tree, 0, 0, "");
+
+// Static-frame timing signal for the harness.
+window.__anyplotReady = true;
diff --git a/plots/circlepacking-basic/metadata/javascript/highcharts.yaml b/plots/circlepacking-basic/metadata/javascript/highcharts.yaml
new file mode 100644
index 0000000000..fb9b18e63c
--- /dev/null
+++ b/plots/circlepacking-basic/metadata/javascript/highcharts.yaml
@@ -0,0 +1,266 @@
+library: highcharts
+language: javascript
+specification_id: circlepacking-basic
+created: '2026-09-02T15:52:32Z'
+updated: '2026-09-02T16:08:57Z'
+generated_by: claude-sonnet
+workflow_run: 33649853396
+issue: 2498
+language_version: 22.23.2
+library_version: 12.6.0
+preview_url_light: https://storage.googleapis.com/anyplot-images/plots/circlepacking-basic/javascript/highcharts/plot-light.png
+preview_url_dark: https://storage.googleapis.com/anyplot-images/plots/circlepacking-basic/javascript/highcharts/plot-dark.png
+preview_html_light: https://storage.googleapis.com/anyplot-images/plots/circlepacking-basic/javascript/highcharts/plot-light.html
+preview_html_dark: https://storage.googleapis.com/anyplot-images/plots/circlepacking-basic/javascript/highcharts/plot-dark.html
+quality_score: 89
+review:
+  strengths:
+  - 'Fixed the attempt-1 hierarchy-depth weakness: components/ is now split into 4
+    named files (Table.jsx, Modal.jsx, Form.jsx, Button.jsx), giving the chart a genuine
+    3-level hierarchy (root -> category -> subdirectory -> file) instead of 2, which
+    better demonstrates the packing algorithm and improves feature coverage'
+  - 'Addressed the attempt-1 uniformity critique: ring stroke width (2.5 for category
+    rings vs 1.8 for nested sub-rings), fill alpha (0.1 vs 0.17), and padding now
+    vary by depth, giving the deeper components/ ring a visually distinct treatment
+    from the top-level category rings'
+  - 'Per-leaf label ink is computed from each fill''s own luminance rather than the
+    page theme, so text stays readable on every one of the 8 Imprint colors in both
+    light and dark renders -- first series correctly uses brand green #009E73'
+  - Data colors are pixel-identical between the light and dark renders; only chrome
+    (title/subtitle ink, ring outline colors) flips, and SVG <title> hover tooltips
+    preserve full names/totals on every circle including truncated small labels
+  weaknesses:
+  - 'New nested-ring label overlap introduced by the added 3rd hierarchy level: the
+    ''components/ · 480 KB'' ring-title text is crossed by the components ring''s
+    own stroke line (the descender of ''p'' in ''components'' is cut by the outline)
+    -- the label formula `y - r + fontSize + 6` doesn''t clear the stroke for depth>=2
+    rings, which use a smaller RING_PADDING * 0.7. Increase the offset (or the padding)
+    for nested rings so their label sits fully above the stroke.'
+  - Smallest leaf labels (font floor is 10px, e.g. 'e2e/', 'icons/', 'guide.md', truncated
+    names like 'types.d...') are legible at full 2400px resolution but wash out at
+    the ~400px mobile thumbnail scale -- consider raising the font floor slightly
+    or hiding labels on circles below ~30px radius instead of the current 28px threshold.
+  - 'Implementation is still 100% chart.renderer with series: [] -- a well-justified
+    workaround given highcharts-more isn''t vendored, but it means Highcharts'' higher-level
+    series/plotOptions API is never exercised, which continues to cap Library Mastery.'
+  image_description: |-
+    Light render (plot-light.png):
+      Background: Warm off-white, consistent with #FAF8F1 -- not pure white.
+      Chrome: Title "circlepacking-basic · javascript · highcharts · anyplot.ai" in bold dark ink at top; subtitle "Repository directory sizes — circle area = file/folder size (KB), colour = directory" in softer gray ink below. Each of the 5 top-level directory rings has a dark-ink label above it (e.g. "build/ · 1.3 MB", "src/ · 1.4 MB"), and the new nested "components/ · 480 KB" sub-ring inside src/ has its own label too. All chrome text is clearly readable against the light background, EXCEPT the "components/ · 480 KB" label whose descender is visibly crossed by the components ring's own stroke line (a minor overlap defect, not a legibility failure -- every character is still fully readable).
+      Data: Root circle outlined in light gray encompasses 5 tinted category rings (src=green #009E73, tests=lavender, docs=blue, assets=ochre, build=matte red -- canonical Imprint order for these abstract directory categories). Inside src/, a nested components/ ring shows 4 named files (Table.jsx, Modal.jsx, Form.jsx, Button...) three levels deep. Each ring has a low-alpha fill in its category color and contains solid leaf circles in the same color, area-scaled to file/folder size. Leaf labels use ink chosen per-leaf from the fill's own luminance (white text on green/red/blue/lavender leaves, dark text on ochre leaves) -- first series is confirmed #009E73.
+      Legibility verdict: PASS (one minor label/stroke overlap noted above, not a blocking failure)
+
+    Dark render (plot-dark.png):
+      Background: Warm near-black, consistent with #1A1A17 -- not pure black.
+      Chrome: Same title and subtitle now rendered in light ink, clearly readable against the dark background. Ring category labels (e.g. "src/ · 1.4 MB", "components/ · 480 KB") flip to light ink for contrast against the page; the same stroke-overlap on "components/" is present here too (chrome-independent, geometry-driven).
+      Data: All 5 category ring colors and all leaf fill colors are pixel-identical to the light render (green/lavender/blue/ochre/red) -- only the chrome flipped. Leaf label ink is unchanged from the light render (e.g. "api.js" still white-on-green, "images/" still dark-on-ochre) since it's computed from each leaf's fixed fill color rather than the page theme -- intended design, reads correctly in both themes. No dark-on-dark or light-on-light failures observed.
+      Legibility verdict: PASS
+  criteria_checklist:
+    visual_quality:
+      score: 26
+      max: 30
+      items:
+      - id: VQ-01
+        name: Text Legibility
+        score: 6
+        max: 8
+        passed: true
+        comment: Explicit font sizes throughout, readable at full resolution in both
+          themes; smallest leaf labels (font floor 10px) still likely to fade at ~400px
+          mobile scale
+      - id: VQ-02
+        name: No Overlap
+        score: 5
+        max: 6
+        passed: true
+        comment: The new 'components/ · 480 KB' nested-ring label is crossed by that
+          ring's own stroke line -- a real but minor overlap, text remains fully readable
+      - id: VQ-03
+        name: Element Visibility
+        score: 5
+        max: 6
+        passed: true
+        comment: Circles well-sized and packed with visible gaps; a couple of the
+          smallest leaf circles are tiny dots by nature of the data
+      - id: VQ-04
+        name: Color Accessibility
+        score: 2
+        max: 2
+        passed: true
+        comment: Per-leaf luminance-based ink keeps contrast high on every palette
+          color; CVD-safe Imprint palette
+      - id: VQ-05
+        name: Layout & Canvas
+        score: 4
+        max: 4
+        passed: true
+        comment: Square 2400x2400 canvas confirmed (measured); root circle fills a
+          good majority of the canvas with balanced margins, no overflow or clipping
+      - id: VQ-06
+        name: Axis Labels & Title
+        score: 2
+        max: 2
+        passed: true
+        comment: No traditional axes needed for circle packing; subtitle explicitly
+          states the unit (KB) and encoding
+      - id: VQ-07
+        name: Palette Compliance
+        score: 2
+        max: 2
+        passed: true
+        comment: 'First series is #009E73; remaining 4 categories use canonical Imprint
+          order; identical data colors across themes; backgrounds theme-correct'
+    design_excellence:
+      score: 17
+      max: 20
+      items:
+      - id: DE-01
+        name: Aesthetic Sophistication
+        score: 7
+        max: 8
+        passed: true
+        comment: Depth-based stroke width and fill alpha differentiation (new this
+          attempt) plus the deeper hierarchy push this clearly past 'configured default'
+          toward polished
+      - id: DE-02
+        name: Visual Refinement
+        score: 5
+        max: 6
+        passed: true
+        comment: No axes/spines, generous whitespace, subtle tinted ring fills; the
+          components/ label crowding keeps it just short of perfect
+      - id: DE-03
+        name: Data Storytelling
+        score: 5
+        max: 6
+        passed: true
+        comment: Size-by-area plus category color plus the new 3rd nesting level makes
+          the largest directories/files immediately obvious while showing genuine
+          hierarchical depth
+    spec_compliance:
+      score: 15
+      max: 15
+      items:
+      - id: SC-01
+        name: Plot Type
+        score: 5
+        max: 5
+        passed: true
+        comment: Genuine circle packing chart
+      - id: SC-02
+        name: Required Features
+        score: 4
+        max: 4
+        passed: true
+        comment: Efficient non-overlapping packing, color-by-category, labels on larger
+          circles with hover for smaller, area-scaled sizing, padded root circle --
+          all present
+      - id: SC-03
+        name: Data Mapping
+        score: 3
+        max: 3
+        passed: true
+        comment: Circle area correctly encodes value (radius = sqrt(value)); all nodes
+          represented
+      - id: SC-04
+        name: Title & Legend
+        score: 3
+        max: 3
+        passed: true
+        comment: Title matches the mandated format exactly; categories self-label
+          on the chart in lieu of a separate legend, which is appropriate here
+    data_quality:
+      score: 15
+      max: 15
+      items:
+      - id: DQ-01
+        name: Feature Coverage
+        score: 6
+        max: 6
+        passed: true
+        comment: Now uses 3 hierarchy levels (root -> category -> components subdirectory
+          -> file), up from 2 in the previous attempt, with good size variation (40
+          KB to 600 KB) across 5 categories and ~30 leaves
+      - id: DQ-02
+        name: Realistic Context
+        score: 5
+        max: 5
+        passed: true
+        comment: Plausible, neutral software-repository directory-size scenario
+      - id: DQ-03
+        name: Appropriate Scale
+        score: 4
+        max: 4
+        passed: true
+        comment: File/folder sizes and MB/KB formatting are realistic and internally
+          consistent
+    code_quality:
+      score: 9
+      max: 10
+      items:
+      - id: CQ-01
+        name: KISS Structure
+        score: 2
+        max: 3
+        passed: true
+        comment: Several helper functions (packCircles, layoutNode, contrastInk, hexToRgba,
+          formatSize) are used, justified by the custom recursive geometry algorithm,
+          but it departs from a flat imports->data->plot script
+      - id: CQ-02
+        name: Reproducibility
+        score: 2
+        max: 2
+        passed: true
+        comment: 'Fully deterministic: hardcoded data, index-seeded relaxation, no
+          RNG'
+      - id: CQ-03
+        name: Clean Imports
+        score: 2
+        max: 2
+        passed: true
+        comment: No unused imports; only browser globals used
+      - id: CQ-04
+        name: Code Elegance
+        score: 2
+        max: 2
+        passed: true
+        comment: Appropriate complexity for a from-scratch recursive packing algorithm;
+          no fake UI/interactivity
+      - id: CQ-05
+        name: Output & API
+        score: 1
+        max: 1
+        passed: true
+        comment: Correct mount-node contract, animation disabled, harness handles
+          PNG/HTML export
+    library_mastery:
+      score: 7
+      max: 10
+      items:
+      - id: LM-01
+        name: Idiomatic Usage
+        score: 3
+        max: 5
+        passed: true
+        comment: Correct, well-integrated use of chart.renderer given highcharts-more
+          isn't vendored, but still bypasses Highcharts' higher-level series/plotOptions
+          API entirely
+      - id: LM-02
+        name: Distinctive Features
+        score: 4
+        max: 5
+        passed: true
+        comment: Leverages chart.renderer.g/circle/text tied into the chart's own
+          plotLeft/plotWidth/margins lifecycle -- a genuinely Highcharts-specific
+          technique, not a generic SVG draw
+  verdict: APPROVED
+impl_tags:
+  dependencies: []
+  techniques:
+  - patches
+  - hover-tooltips
+  patterns:
+  - iteration-over-groups
+  dataprep: []
+  styling:
+  - alpha-blending