From 7f485bbe729d339aa9b5b86199fd5de8da706336 Mon Sep 17 00:00:00 2001
From: Brummel <mould@mycelium.de>
Date: Wed, 10 Jun 2026 10:58:47 +0200
Subject: [PATCH] docs(design): graph-render redesign prototype
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Interactive, throwaway prototype of the aura graph render redesign — the
visual language ratified for cycle 0026, replacing the ascii-dag text view.
Homogeneous pin-nodes (body + n input pins + m output pins) rendered via
Graphviz-WASM in the browser; pin-to-pin edges, type-as-colour, drill-down +
inline-expand of composites, per-element styled tooltips, source/sink colouring,
top-rank input ordering. index.html is the artifact; the ~1.4 MB WASM dep is
git-ignored and restored by fetch-deps.sh. Visual companion to docs/specs/0026.
---
 .../design/prototypes/graph-render/.gitignore |   2 +
 docs/design/prototypes/graph-render/README.md |  54 ++++
 .../prototypes/graph-render/fetch-deps.sh     |   8 +
 .../design/prototypes/graph-render/index.html | 259 ++++++++++++++++++
 4 files changed, 323 insertions(+)
 create mode 100644 docs/design/prototypes/graph-render/.gitignore
 create mode 100644 docs/design/prototypes/graph-render/README.md
 create mode 100755 docs/design/prototypes/graph-render/fetch-deps.sh
 create mode 100644 docs/design/prototypes/graph-render/index.html

diff --git a/docs/design/prototypes/graph-render/.gitignore b/docs/design/prototypes/graph-render/.gitignore
new file mode 100644
index 0000000..14e3565
--- /dev/null
+++ b/docs/design/prototypes/graph-render/.gitignore
@@ -0,0 +1,2 @@
+viz-standalone.js
+svg-pan-zoom.min.js
diff --git a/docs/design/prototypes/graph-render/README.md b/docs/design/prototypes/graph-render/README.md
new file mode 100644
index 0000000..d4fc430
--- /dev/null
+++ b/docs/design/prototypes/graph-render/README.md
@@ -0,0 +1,54 @@
+# graph-render prototype
+
+An interactive, throwaway prototype of the **`aura graph` render redesign** — the
+visual language ratified during the cycle that replaces the `ascii-dag` text view.
+It is a *reference for the implementation*, not shippable code: the Rust serializer
+in `aura-cli` should emit the DOT this prototype generates, and the shipped viewer
+should mirror this harness.
+
+## Run
+
+```sh
+./fetch-deps.sh                       # restore the two git-ignored vendored deps
+python3 -m http.server 8000 --bind 0.0.0.0
+# open http://<host>:8000/ in a browser
+```
+
+`index.html` is the artifact (all the design decisions live there). The vendored
+deps are git-ignored because one is a ~1.4 MB WASM blob; `fetch-deps.sh` re-pins
+them (`@viz-js/viz@3.7.0`, `svg-pan-zoom@3.6.1`).
+
+## What it embodies (the ratified visual language)
+
+- **Substrate.** aura emits **DOT**; layout + draw is **Graphviz compiled to
+  WebAssembly**, run in the browser (`@viz-js/viz`). No native binary, no layout
+  engine in aura — aura is a *serializer*, Graphviz does the rest. Runs on a thin
+  client (validated on a Chromebook over LAN).
+- **Homogeneous node template.** Every node = body (type + param signature) + n
+  input pins + m output pins, generated from one template off the declared
+  interface (`NodeSchema`). Each pin/body is an individually addressable cell.
+- **Pin-to-pin edges.** Edges dock output-pin → input-pin (DOT `node:port`), not
+  node-to-node.
+- **Type as colour.** One colour per scalar base type (i64/f64/bool/timestamp) on
+  pins, params, and wires. The `: kind` text is off by default.
+- **Navigation.** A composite is opaque with a left `[+]` button (inline-expand to
+  a framed cluster, recursively / nested) and a body click (drill-down to its
+  interior, with a breadcrumb).
+- **Styled per-element tooltips.** A cursor-following div with mini-markdown: a pin
+  shows `name · kind` (+ firing), a body shows type + params, an edge shows the
+  kind, an expanded cluster shows the composite name.
+- **Roles by colour + position.** Sources green, sinks maroon; composite-boundary
+  `in:`/`out:` markers render as sources/sinks. Sources/inputs are pinned to the
+  top rank in signature order; outputs to the bottom rank (free order); sinks float.
+
+The canonical, prose record of these decisions is the cycle **spec** under
+`docs/specs/` — this prototype is the visual companion to it.
+
+## Graphviz gotchas baked in (carry into the implementation)
+
+- Use a Graphviz **core font** (`Courier`) so HTML-label box sizing matches the
+  rendered text — a web font overflows the box (Graphviz lays out with its own
+  font metrics).
+- Graphviz prefixes anchor (`href`) element ids with `a_` in the SVG.
+- Strip Graphviz's native `<title>`/`xlink:title` (they pop up as browser tooltips)
+  and supply our own.
diff --git a/docs/design/prototypes/graph-render/fetch-deps.sh b/docs/design/prototypes/graph-render/fetch-deps.sh
new file mode 100755
index 0000000..92d4eee
--- /dev/null
+++ b/docs/design/prototypes/graph-render/fetch-deps.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# Restore the vendored, re-downloadable render deps for the graph-render prototype.
+# These are deliberately git-ignored (a ~1.4 MB WASM blob); index.html is the artifact.
+set -euo pipefail
+cd "$(dirname "$0")"
+curl -sL https://unpkg.com/@viz-js/viz@3.7.0/lib/viz-standalone.js -o viz-standalone.js
+curl -sL https://unpkg.com/svg-pan-zoom@3.6.1/dist/svg-pan-zoom.min.js -o svg-pan-zoom.min.js
+echo "deps restored. serve with: python3 -m http.server 8000 --bind 0.0.0.0"
diff --git a/docs/design/prototypes/graph-render/index.html b/docs/design/prototypes/graph-render/index.html
new file mode 100644
index 0000000..23533f8
--- /dev/null
+++ b/docs/design/prototypes/graph-render/index.html
@@ -0,0 +1,259 @@
+<!doctype html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>aura graph — PoC (nested composites, multi-input)</title>
+<style>
+  html, body { margin: 0; height: 100%; background: #16161a; color: #cdd6f4;
+    font-family: ui-monospace, monospace; }
+  header { padding: 8px 14px; border-bottom: 1px solid #313244; font-size: 13px;
+    display: flex; gap: 16px; align-items: baseline; flex-wrap: nowrap;
+    white-space: nowrap; overflow: hidden; }
+  header b { color: #f5e0dc; } .sub { color: #6c7086; }
+  #crumb a { color: #89b4fa; cursor: pointer; text-decoration: none; }
+  #crumb a:hover { text-decoration: underline; }
+  #crumb .sep { color: #6c7086; }
+  #status { color: #6c7086; margin-left: auto; }
+  #stage { width: 100%; height: calc(100% - 44px); }
+  #stage svg { width: 100%; height: 100%; cursor: default; }
+  #stage svg text { cursor: inherit; user-select: none; -webkit-user-select: none; }
+  #stage svg a { cursor: inherit; }
+  #err { padding: 14px; color: #f38ba8; white-space: pre-wrap; }
+  #tip { position: fixed; display: none; pointer-events: none; z-index: 10;
+    background: #1e1e2e; border: 1px solid #585b70; border-radius: 6px; padding: 6px 9px;
+    font-family: ui-monospace, monospace; font-size: 12px; color: #cdd6f4;
+    max-width: 420px; box-shadow: 0 6px 18px rgba(0,0,0,.55); line-height: 1.5; }
+  #tip b { color: #f5e0dc; } #tip code { color: #89b4fa; } #tip .dim { color: #7f849c; }
+</style>
+</head>
+<body>
+<header>
+  <b>aura graph</b>
+  <span id="crumb"></span>
+  <span class="sub">hover · [+] expand · body drill</span>
+</header>
+<div id="stage"></div>
+<div id="tip"></div>
+<pre id="err"></pre>
+
+<script src="./viz-standalone.js"></script>
+<script src="./svg-pan-zoom.min.js"></script>
+<script>
+const TYPE_COLOR = { i64: "#f9e2af", f64: "#89b4fa", bool: "#a6e3a1", timestamp: "#cba6f7" };
+const COLOR_TYPE = Object.fromEntries(Object.entries(TYPE_COLOR).map(([k, v]) => [v.toLowerCase(), k]));
+const PURPLE = "#5b4b8a", TEAL = "#2c5a5a", PLUS = "#7c6ba8";
+const LEAF = "#45475a", SOURCE = "#2e5a3a", SINK = "#5a2e3e";
+const bodyBgFor = (role) => role === "source" ? SOURCE : role === "sink" ? SINK : LEAF;
+const HEAD = `bgcolor="#16161a"; rankdir=TB; nodesep=0.5; ranksep=0.65;
+  node [shape=plaintext, fontname="Courier", fontsize=12];
+  edge [penwidth=1.7, arrowsize=0.8];`;
+const col = (k) => TYPE_COLOR[k] || "#cdd6f4";
+const F = "f64", I = "i64";
+
+// === hierarchical model: leaves, composites, the root harness ================
+const P = (type, params, ins, outs, role) => ({ prim: { type, params, ins, outs, role: role || "node" } });
+const C = (comp) => ({ comp });
+// edge endpoints: "@role" (composite input) · "key.oN"/"key.iN" · "#N" (composite output)
+const COMP = {
+  macd: {
+    inputs: [["price", F]], outputs: [["macd", F], ["signal", F], ["histogram", F]],
+    nodes: {
+      ema_f: P("EMA", [["fast", I]], [["price", F]], [["ema", F]]),
+      ema_s: P("EMA", [["slow", I]], [["price", F]], [["ema", F]]),
+      sub_m: P("Sub", [], [["a", F], ["b", F]], [["diff", F]]),
+      ema_sig: P("EMA", [["signal", I]], [["macd", F]], [["ema", F]]),
+      sub_h: P("Sub", [], [["a", F], ["b", F]], [["diff", F]]),
+    },
+    edges: [["@price", "ema_f.i0"], ["@price", "ema_s.i0"], ["ema_f.o0", "sub_m.i0"], ["ema_s.o0", "sub_m.i1"],
+      ["sub_m.o0", "ema_sig.i0"], ["sub_m.o0", "sub_h.i0"], ["ema_sig.o0", "sub_h.i1"],
+      ["sub_m.o0", "#0"], ["ema_sig.o0", "#1"], ["sub_h.o0", "#2"]],
+  },
+  vol_regime: { // multi-input composite: volume + price
+    inputs: [["volume", F], ["price", F]], outputs: [["regime", F]],
+    nodes: {
+      sma_v: P("SMA", [["window", I]], [["x", F]], [["avg", F]]),
+      mul: P("Mul", [], [["a", F], ["b", F]], [["p", F]]),
+      clamp: P("Clamp", [["lo", F], ["hi", F]], [["x", F]], [["y", F]]),
+    },
+    edges: [["@volume", "sma_v.i0"], ["@price", "mul.i0"], ["sma_v.o0", "mul.i1"], ["mul.o0", "clamp.i0"], ["clamp.o0", "#0"]],
+  },
+  strategy: { // multi-input + contains two composites (one of them multi-input)
+    inputs: [["price", F], ["volume", F]], outputs: [["exposure", F]],
+    nodes: { macd: C("macd"), vol: C("vol_regime"), gate: P("Mul", [], [["a", F], ["b", F]], [["exposure", F]]) },
+    edges: [["@price", "macd.i0"], ["@volume", "vol.i0"], ["@price", "vol.i1"],
+      ["macd.o2", "gate.i0"], ["vol.o0", "gate.i1"], ["gate.o0", "#0"]],
+  },
+};
+const ROOT = {
+  inputs: [], outputs: [],
+  nodes: {
+    price: P("price", [], [], [["price", F]], "source"),
+    volume: P("volume", [], [], [["volume", F]], "source"),
+    strategy: C("strategy"),
+    broker: P("SimBroker", [["spread", F]], [["exposure", F], ["price", F, { firing: "barrier 0" }]], [["equity", F]]),
+    rec_e: P("Recorder", [], [["exposure", F]], [], "sink"),
+    rec_q: P("Recorder", [], [["equity", F]], [], "sink"),
+  },
+  edges: [["price.o0", "strategy.i0"], ["volume.o0", "strategy.i1"], ["price.o0", "broker.i1"],
+    ["strategy.o0", "broker.i0"], ["strategy.o0", "rec_e.i0"], ["broker.o0", "rec_q.i0"]],
+};
+
+// === ONE homogeneous, per-cell-addressable node template =====================
+function cellLabel(id, o, showTypes) {
+  const cols = Math.max(o.ins.length, o.outs.length, 1);
+  const span = (n) => Math.max(1, Math.floor(cols / n));
+  const txt = (n, k) => (showTypes && k) ? `${n} : ${k}` : n;
+  const cell = (io, arr) => ([n, k], i) =>
+    `<td port="${io}${i}" id="P_${id}_${io}${i}" href="#" colspan="${span(arr.length)}" ` +
+    `bgcolor="${io === "i" ? "#222b33" : "#332b22"}"><font color="${col(k)}">${txt(n, k)}</font></td>`;
+  const sp = o.params.map(([n, k]) => `<font color="${col(k)}">${showTypes && k ? `${n}:${k}` : n}</font>`);
+  const sig = o.params.length ? `<font color="#9399b2">(</font>${sp.join('<font color="#9399b2">, </font>')}<font color="#9399b2">)</font>` : "";
+  const name = `<font color="#f5f5f5"><b>${o.type}</b></font>${sig}`;
+  let bodyRow;
+  if (o.composite) {
+    bodyRow = `<tr><td colspan="${cols}" bgcolor="${o.bodyBg}"><table border="0" cellborder="0" cellspacing="3"><tr>` +
+      `<td id="plus_${id}" href="#" align="center" valign="middle" fixedsize="true" width="24" height="24" border="1" color="#a594c8" bgcolor="${PLUS}"><font color="#f5f5f5"><b>+</b></font></td>` +
+      `<td id="B_${id}" href="#">${name}</td></tr></table></td></tr>`;
+  } else {
+    bodyRow = `<tr><td id="B_${id}" href="#" colspan="${cols}" bgcolor="${o.bodyBg}">${name}</td></tr>`;
+  }
+  let rows = "";
+  if (o.ins.length) rows += `<tr>${o.ins.map(cell("i", o.ins)).join("")}</tr>`;
+  rows += bodyRow;
+  if (o.outs.length) rows += `<tr>${o.outs.map(cell("o", o.outs)).join("")}</tr>`;
+  return `<<table border="0" cellborder="1" cellspacing="0" cellpadding="6">${rows}</table>>`;
+}
+function addInfo(INFO, id, o) {
+  const ps = o.params && o.params.length ? o.params.map(([n, k]) => `\`${n}:${k}\``).join(", ") : "<span class='dim'>none</span>";
+  INFO.B[id] = `**${o.type}** <span class='dim'>· ${o.role || "node"}</span>\nparams: ${ps}`;
+  (o.ins || []).forEach(([n, k, m], i) => INFO.P[`P_${id}_i${i}`] = `**${n}** · \`${k}\`` + (m && m.firing ? `\nfiring: \`${m.firing}\`` : ""));
+  (o.outs || []).forEach(([n, k], i) => INFO.P[`P_${id}_o${i}`] = `**${n}** · \`${k}\``);
+}
+
+// === recursive DOT generator (the mini-inliner) ==============================
+function genDot(def, role, expandedSet, showTypes) {
+  const INFO = { B: {}, P: {}, C: {} }, drill = {}, expandable = [], clusters = [], edges = [], topRank = [], bottomRank = [];
+  function build(path, def, brole) {
+    const childRes = {}; let block = "";
+    for (const key in def.nodes) {
+      const inst = def.nodes[key], cpath = [...path, key], cid = cpath.join("__");
+      if (inst.prim) {
+        const s = inst.prim;
+        block += `${cid} [label=${cellLabel(cid, { type: s.type, params: s.params, ins: s.ins, outs: s.outs, bodyBg: bodyBgFor(s.role), composite: false }, showTypes)}];\n`;
+        addInfo(INFO, cid, s);
+        if (s.role === "source") topRank.push(cid); // sinks are placed freely (not rank-pinned)
+        childRes[key] = { type: "leaf", id: cid, spec: s };
+      } else {
+        const cname = inst.comp, cdef = COMP[cname];
+        if (expandedSet.has(cid)) {
+          const sub = build(cpath, cdef, "cluster"); clusters.push(cid);
+          INFO.C["clust_" + cid] = `**${cname}** <span class='dim'>· composite · click frame to collapse</span>`;
+          block += `subgraph cluster_${cid} { id="clust_${cid}"; style=filled; color="#5b4b8a"; fillcolor="#211c30"; penwidth=2;\n${sub.block}}\n`;
+          childRes[key] = { type: "exp", resolveIn: sub.resolveIn, resolveOut: sub.resolveOut };
+        } else {
+          block += `${cid} [label=${cellLabel(cid, { type: cname, params: [], ins: cdef.inputs, outs: cdef.outputs, bodyBg: PURPLE, composite: true }, showTypes)}];\n`;
+          addInfo(INFO, cid, { type: cname, role: "composite", params: [], ins: cdef.inputs, outs: cdef.outputs });
+          drill[cid] = cname; expandable.push(cid);
+          childRes[key] = { type: "opaque", id: cid, cdef };
+        }
+      }
+    }
+    const pk = (r, io, idx) => r.type === "leaf" ? (io === "i" ? r.spec.ins : r.spec.outs)[idx][1] : (io === "i" ? r.cdef.inputs : r.cdef.outputs)[idx][1];
+    const resTarget = (ep) => { const [k, p] = ep.split("."); const idx = +p.slice(1), r = childRes[k]; return r.type === "exp" ? r.resolveIn(idx) : [{ id: r.id, port: "i" + idx, kind: pk(r, "i", idx) }]; };
+    const resSource = (ep) => { const [k, p] = ep.split("."); const idx = +p.slice(1), r = childRes[k]; return r.type === "exp" ? r.resolveOut(idx) : { id: r.id, port: "o" + idx, kind: pk(r, "o", idx) }; };
+    const resolveIn = (i) => { const rn = "@" + def.inputs[i][0]; return def.edges.filter(e => e[0] === rn).flatMap(e => resTarget(e[1])); };
+    const resolveOut = (i) => { const e = def.edges.find(e => e[1] === "#" + i); return resSource(e[0]); };
+    for (const [f, t] of def.edges) { if (f[0] === "@" || t[0] === "#") continue; const s = resSource(f); for (const d of resTarget(t)) edges.push([s, d]); }
+    if (brole === "drill") {
+      def.inputs.forEach(([rn, rk], i) => { const bid = `bin_${i}`;
+        block += `${bid} [label=${cellLabel(bid, { type: rn, params: [], ins: [], outs: [[rn, rk]], bodyBg: SOURCE, composite: false }, showTypes)}];\n`;
+        addInfo(INFO, bid, { type: rn, role: "input", params: [], ins: [], outs: [[rn, rk]] });
+        topRank.push(bid);
+        resolveIn(i).forEach(d => edges.push([{ id: bid, port: "o0", kind: rk }, d])); });
+      def.outputs.forEach(([on, ok], i) => { const bid = `bout_${i}`;
+        block += `${bid} [label=${cellLabel(bid, { type: on, params: [], ins: [[on, ok]], outs: [], bodyBg: SINK, composite: false }, showTypes)}];\n`;
+        addInfo(INFO, bid, { type: on, role: "output", params: [], ins: [[on, ok]], outs: [] });
+        bottomRank.push(bid);
+        edges.push([resolveOut(i), { id: bid, port: "i0", kind: ok }]); });
+    }
+    return { block, resolveIn, resolveOut };
+  }
+  const top = build([], def, role);
+  let dot = `digraph g { ${HEAD}\n${top.block}`;
+  // annotation by position: sources/inputs share the top rank, outputs the bottom rank.
+  // Only the top row gets an invisible chain pinning its left-to-right order to
+  // signature order; the bottom row (outputs) is pinned to rank=max but ordered freely,
+  // and sinks are not rank-pinned at all (placed wherever the layout prefers).
+  const rankRow = (ids, r, chain) => ids.length
+    ? `{rank=${r};${ids.map(id => " " + id + ";").join("")}${chain && ids.length > 1 ? " " + ids.join(" -> ") + " [style=invis];" : ""}}\n`
+    : "";
+  dot += rankRow(topRank, "min", true);
+  dot += rankRow(bottomRank, "max", false);
+  for (const [s, d] of edges) dot += `${s.id}:${s.port}:s -> ${d.id}:${d.port}:n [color="${TYPE_COLOR[s.kind] || "#7f849c"}"];\n`;
+  return { dot: dot + "}", info: INFO, drill, expandable, clusters };
+}
+
+// === styled tooltip + interaction ============================================
+const tip = document.getElementById("tip");
+const md = (s) => s.replace(/\*\*(.+?)\*\*/g, "<b>$1</b>").replace(/`(.+?)`/g, "<code>$1</code>").replace(/\n/g, "<br>");
+function showTip(text, x, y) {
+  tip.innerHTML = md(text); tip.style.display = "block";
+  const w = tip.offsetWidth, h = tip.offsetHeight;
+  let l = x + 14, t = y + 16;
+  if (l + w > innerWidth - 8) l = x - w - 14;
+  if (t + h > innerHeight - 8) t = y - h - 16;
+  tip.style.left = l + "px"; tip.style.top = t + "px";
+}
+const hideTip = () => { tip.style.display = "none"; };
+
+const stage = document.getElementById("stage"), crumbEl = document.getElementById("crumb");
+let viz, viewStack = [{ name: "root", def: ROOT }], expanded = new Set(), SHOW_TYPES = false, INFO = { B: {}, P: {}, C: {} };
+
+function chrome() {
+  crumbEl.innerHTML = "";
+  viewStack.forEach((v, i) => {
+    if (i) { const s = document.createElement("span"); s.className = "sep"; s.textContent = " › "; crumbEl.appendChild(s); }
+    const a = document.createElement("a"); a.textContent = v.name;
+    a.onclick = () => { viewStack = viewStack.slice(0, i + 1); expanded = new Set(); show(); };
+    crumbEl.appendChild(a);
+  });
+}
+
+function show() {
+  const v = viewStack[viewStack.length - 1];
+  const G = genDot(v.def, v.name === "root" ? "root" : "drill", expanded, SHOW_TYPES);
+  INFO = G.info;
+  stage.innerHTML = ""; hideTip();
+  const svg = viz.renderSVGElement(G.dot);
+  stage.appendChild(svg);
+  const pz = svgPanZoom(svg, { zoomEnabled: true, controlIconsEnabled: true, fit: true, center: true, minZoom: 0.1, maxZoom: 12, dblClickZoomEnabled: false });
+  addEventListener("resize", () => { pz.resize(); pz.fit(); pz.center(); });
+  svg.querySelectorAll("title").forEach(t => t.remove());
+  svg.querySelectorAll("a").forEach(a => a.removeAttributeNS("http://www.w3.org/1999/xlink", "title"));
+
+  const idOf = (el) => { const a = el.closest && el.closest("a[id], g[id]"); return a ? a.id.replace(/^a_/, "") : ""; };
+  svg.addEventListener("mousemove", (e) => {
+    const id = idOf(e.target);
+    if (id.startsWith("P_") && INFO.P[id]) return showTip(INFO.P[id], e.clientX, e.clientY);
+    if (id.startsWith("B_")) { const k = id.slice(2); if (INFO.B[k]) return showTip(INFO.B[k], e.clientX, e.clientY); }
+    if (id.startsWith("plus_")) return showTip("**expand** inline", e.clientX, e.clientY);
+    if (id.startsWith("clust_") && INFO.C[id]) return showTip(INFO.C[id], e.clientX, e.clientY);
+    const eg = e.target.closest && e.target.closest("g.edge");
+    if (eg) { const p = eg.querySelector("path"); const c = p && p.getAttribute("stroke") ? p.getAttribute("stroke").toLowerCase() : ""; return showTip("`" + (COLOR_TYPE[c] || "?") + "`", e.clientX, e.clientY); }
+    hideTip();
+  });
+  svg.addEventListener("mouseleave", hideTip);
+  svg.addEventListener("click", (e) => { const a = e.target.closest && e.target.closest("a"); if (a) e.preventDefault(); });
+
+  const click = (id, fn) => { const el = svg.getElementById(id) || svg.getElementById("a_" + id); if (el) { el.style.cursor = "pointer"; el.addEventListener("click", e => { e.preventDefault(); e.stopPropagation(); fn(); }); } };
+  for (const id in G.drill) click("B_" + id, () => { viewStack.push({ name: G.drill[id], def: COMP[G.drill[id]] }); expanded = new Set(); show(); });
+  for (const id of G.expandable) click("plus_" + id, () => { expanded.add(id); show(); });
+  for (const id of G.clusters) click("clust_" + id, () => { expanded.delete(id); show(); });
+  chrome();
+}
+
+Viz.instance().then(v => { viz = v; show(); }).catch(e => { document.getElementById("err").textContent = String(e && e.stack || e); });
+</script>
+</body>
+</html>