diff --git a/static/umbrella.css b/static/umbrella.css
index 9feb8b2..1afdd50 100644
--- a/static/umbrella.css
+++ b/static/umbrella.css
@@ -45,10 +45,21 @@
   padding: 6px 10px; font-size: 12px; cursor: pointer;
 }
 .umbrella-controls button:hover { border-color: var(--accent); color: var(--accent); }
+.umbrella-controls button.active {
+  border-color: var(--accent-2);
+  color: var(--accent-2);
+  background: rgba(251,191,36,0.08);
+}
 .umbrella-filters {
   grid-column: 1 / -1;
   display: flex; flex-wrap: wrap; gap: 6px;
 }
+.umbrella-disclosure {
+  grid-column: 1 / -1;
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+}
 .chip {
   background: var(--bg); color: var(--fg-dim);
   border: 1px solid #2a2f3a; border-radius: 999px;
@@ -56,9 +67,51 @@
   font-family: var(--mono);
 }
 .chip.active { color: var(--accent); border-color: var(--accent); background: rgba(110,231,183,0.08); }
+.chip.disclosure-chip { border-style: dashed; }
+.chip.disclosure-chip.active { border-style: solid; }
 
-.umbrella-canvas { position: relative; display: grid; grid-template-columns: 1fr; }
+.umbrella-canvas { position: relative; display: grid; grid-template-columns: 1fr; overflow: hidden; }
 .umbrella-cy { position: absolute; inset: 0; }
+.umbrella-layer-overlay {
+  position: absolute;
+  inset: 0;
+  pointer-events: none;
+  z-index: 1;
+}
+.umbrella-cy { z-index: 2; }
+.layer-band {
+  position: absolute;
+  border: 1px solid rgba(231,234,240,0.10);
+  border-radius: 8px;
+  background: rgba(21,24,31,0.42);
+  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
+}
+.layer-band.collapsed {
+  opacity: 0.76;
+}
+.layer-band-label {
+  position: absolute;
+  left: 12px;
+  top: 8px;
+  display: flex;
+  gap: 8px;
+  align-items: baseline;
+  font-family: var(--mono);
+  color: var(--fg);
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  font-size: 11px;
+  background: rgba(15,17,21,0.72);
+  border-radius: 4px;
+  padding: 2px 6px;
+}
+.layer-band-label .count {
+  color: var(--fg-dim);
+  font-size: 10px;
+}
+.layer-band.collapsed .layer-band-label .count {
+  color: var(--accent-2);
+}
 .umbrella-side {
   position: absolute; top: 0; right: 0; bottom: 0;
   width: 420px; background: var(--bg-2);
diff --git a/static/umbrella.html b/static/umbrella.html
index 209c213..dc3acf3 100644
--- a/static/umbrella.html
+++ b/static/umbrella.html
@@ -16,13 +16,16 @@
         <button data-layout="cose">force</button>
         <button data-layout="breadthfirst">tier</button>
         <button data-layout="concentric">center</button>
+        <button data-view="spine">spine</button>
+        <button data-view="org">org chart</button>
+        <button data-view="mindmap">mindmap</button>
         <button id="reset">reset</button>
       </div>
-      <div class="umbrella-filters" id="filters">
-        <!-- filter chips injected by JS based on node types -->
-      </div>
+      <div class="umbrella-filters" id="filters"></div>
+      <div class="umbrella-disclosure" id="disclosure"></div>
     </header>
     <main class="umbrella-canvas">
+      <div id="layerOverlay" class="umbrella-layer-overlay" aria-hidden="true"></div>
       <div id="cy" class="umbrella-cy"></div>
       <aside id="side" class="umbrella-side" data-open="false">
         <button class="close" id="closeSide" title="close">×</button>
diff --git a/static/umbrella.js b/static/umbrella.js
index b470bdf..862edae 100644
--- a/static/umbrella.js
+++ b/static/umbrella.js
@@ -6,14 +6,14 @@
   "use strict";
 
   const TYPE_COLOR = {
-    doc: "#6ee7b7",
-    profile: "#fbbf24",
+    doc: "#64748b",
+    profile: "#6ee7b7",
     skill: "#a78bfa",
-    mcp_server: "#60a5fa",
+    mcp_server: "#f97316",
     sovereign_api: "#f97316",
-    cortex_tool: "#94a3b8",
+    cortex_tool: "#60a5fa",
     external_dep: "#f87171",
-    credential: "#475569",
+    credential: "#be647a",
   };
   const TYPE_SHAPE = {
     doc: "round-rectangle",
@@ -34,11 +34,24 @@
     cites:      { color: "#38bdf8", style: "dotted" },
     derives_from: { color: "#f59e0b", style: "dashed" },
   };
+  const SPINE_LAYERS = [
+    { key: "system", label: "System Spine", color: "#e7eaf0", baseWidth: 920 },
+    { key: "governance", label: "Governance / Protocols", color: "#fbbf24", baseWidth: 1240 },
+    { key: "runtime", label: "Runtime / WebUI / Services", color: "#60a5fa", baseWidth: 880 },
+    { key: "profiles", label: "Agents / Profiles", color: "#6ee7b7", baseWidth: 680 },
+    { key: "capabilities", label: "Skills / Tools / APIs", color: "#a78bfa", baseWidth: 2200 },
+    { key: "projects", label: "Projects / Domain Systems", color: "#14b8a6", baseWidth: 760 },
+    { key: "knowledge", label: "SOT / Evidence / Outputs", color: "#94a3b8", baseWidth: 2200 },
+  ];
 
   let cy = null;
   let graph = null;
+  let layerOverlayState = null;
   const activeTypes = new Set();
-  window.__svrntyUmbrella = { ready: false, error: null, nodes: 0, edges: 0 };
+  const quietTypes = new Set(["credential"]);
+  const quietLayers = new Set(["knowledge"]);
+  const disclosedLayers = new Set();
+  window.__svrntyUmbrella = { ready: false, error: null, nodes: 0, edges: 0, view: "force" };
 
   async function loadGraph() {
     const res = await fetch("/api/umbrella", { cache: "no-store" });
@@ -59,18 +72,58 @@
   function renderFilters(g) {
     const types = [...new Set(g.nodes.map(n => n.type))].sort();
     const wrap = document.getElementById("filters");
+    const disclosure = document.getElementById("disclosure");
     wrap.innerHTML = "";
+    disclosure.innerHTML = "";
     types.forEach(t => {
       activeTypes.add(t);
       const chip = document.createElement("button");
-      chip.className = "chip active";
+      chip.className = "chip active" + (quietTypes.has(t) ? " disclosure-chip" : "");
       chip.dataset.type = t;
       chip.style.borderColor = TYPE_COLOR[t] || "#475569";
       chip.style.color = TYPE_COLOR[t] || "#e7eaf0";
-      chip.textContent = `${t} (${g.nodes.filter(n => n.type === t).length})`;
+      chip.textContent = `${quietTypes.has(t) ? "show " : ""}${t} (${g.nodes.filter(n => n.type === t).length})`;
       chip.addEventListener("click", () => toggleType(t, chip));
-      wrap.appendChild(chip);
+      (quietTypes.has(t) ? disclosure : wrap).appendChild(chip);
     });
+    quietLayers.forEach((layer) => {
+      const count = g.nodes.filter((n) => _spineLayerKey(n) === layer).length;
+      const chip = document.createElement("button");
+      chip.className = "chip disclosure-chip";
+      chip.dataset.layerDisclosure = layer;
+      chip.textContent = `show ${_layerLabel(layer)} (${count})`;
+      chip.addEventListener("click", () => toggleLayerDisclosure(layer, chip));
+      disclosure.appendChild(chip);
+    });
+  }
+
+  function applyDefaultDisclosure() {
+    quietTypes.forEach((t) => activeTypes.delete(t));
+    disclosedLayers.clear();
+    document.querySelectorAll(".chip[data-type]").forEach((chip) => {
+      chip.classList.toggle("active", activeTypes.has(chip.dataset.type));
+    });
+    document.querySelectorAll(".chip[data-layer-disclosure]").forEach((chip) => {
+      chip.classList.toggle("active", disclosedLayers.has(chip.dataset.layerDisclosure));
+    });
+    applyFilter();
+  }
+
+  function _layerLabel(layer) {
+    if (layer === "knowledge") return "SOT / evidence";
+    return layer;
+  }
+
+  function toggleLayerDisclosure(layer, chipEl) {
+    if (disclosedLayers.has(layer)) {
+      disclosedLayers.delete(layer);
+      chipEl.classList.remove("active");
+    } else {
+      disclosedLayers.add(layer);
+      chipEl.classList.add("active");
+    }
+    applyFilter();
+    if (window.__svrntyUmbrella.view === "spine") runPresetView("spine");
   }
 
   function toggleType(t, chipEl) {
@@ -83,7 +136,9 @@
     if (!cy) return;
     cy.batch(() => {
       cy.nodes().forEach(n => {
-        const visible = activeTypes.has(n.data("type"));
+        const layer = n.data("layer");
+        const visible = activeTypes.has(n.data("type")) &&
+          (!quietLayers.has(layer) || disclosedLayers.has(layer));
         n.style("display", visible ? "element" : "none");
       });
       cy.edges().forEach(e => {
@@ -96,7 +151,14 @@
 
   function buildCyElements(g) {
     const nodes = g.nodes.map(n => ({
-      data: { id: n.id, label: n.label || n.id, type: n.type, raw: n },
+      data: {
+        id: n.id,
+        label: n.label || n.id,
+        shortLabel: _shortLabel(n.label || n.id),
+        type: n.type,
+        raw: n,
+        ..._visualMeta(n),
+      },
     }));
     const edges = g.edges.map((e, i) => ({
       data: { id: `e${i}`, source: e.source, target: e.target, type: e.type, raw: e },
@@ -115,21 +177,27 @@
           style: {
             "background-color": ele => TYPE_COLOR[ele.data("type")] || "#475569",
             "shape": ele => TYPE_SHAPE[ele.data("type")] || "ellipse",
-            "label": "data(label)",
+            "label": ele => ele.data("important") ? ele.data("shortLabel") : "",
             "color": "#e7eaf0",
             "text-valign": "bottom",
             "text-margin-y": 4,
-            "font-size": 10,
+            "font-size": ele => ele.data("fontSize") || 10,
             "font-family": "ui-monospace, monospace",
-            "width": 28,
-            "height": 28,
+            "width": ele => ele.data("nodeWidth") || 28,
+            "height": ele => ele.data("nodeHeight") || 28,
             "border-width": 1,
             "border-color": "#0f1115",
+            "text-wrap": "wrap",
+            "text-max-width": ele => Math.max(90, (ele.data("nodeWidth") || 28) + 44),
           },
         },
         {
           selector: "node:selected",
-          style: { "border-width": 3, "border-color": "#fbbf24" },
+          style: { "border-width": 3, "border-color": "#fbbf24", "label": "data(label)" },
+        },
+        {
+          selector: "node.hover",
+          style: { "label": "data(label)", "z-index": 20 },
         },
         {
           selector: "edge",
@@ -150,8 +218,406 @@
       ],
       layout: { name: "cose", animate: false, idealEdgeLength: 80, nodeRepulsion: 12000 },
     });
+    window.cy = cy;
     cy.on("tap", "node", (evt) => openSidePanel(evt.target.data("raw")));
     cy.on("tap", (evt) => { if (evt.target === cy) closeSidePanel(); });
+    cy.on("mouseover", "node", (evt) => focusNode(evt.target));
+    cy.on("mouseout", "node", (evt) => {
+      evt.target.removeClass("hover");
+      resetGraphEmphasis();
+    });
+    cy.on("zoom", () => applyLabelDensity());
+    cy.on("pan zoom render", () => updateLayerOverlay());
+  }
+
+  function _shortLabel(value) {
+    const label = String(value || "");
+    if (label.length <= 24) return label;
+    return label.slice(0, 21) + "...";
+  }
+
+  function _estimatedLabelWidth(node) {
+    const label = String(node.label || node.id || "");
+    const layer = node.layer || _spineLayerKey(node);
+    const priority = node.labelPriority || _labelPriority(node, layer);
+    const size = node.nodeWidth ? node : _nodeSize(node, layer, priority);
+    return Math.min(320, Math.max(size.nodeWidth || size.width || 92, label.length * 7 + 44));
+  }
+
+  function _isImportantNode(node) {
+    const id = node.id || "";
+    return node.type === "profile" ||
+      ["readme", "architecture", "cortex-os-framework", "cortex-os-roadmap"].includes(id);
+  }
+
+  function _visualMeta(node) {
+    const layer = _spineLayerKey(node);
+    const priority = _labelPriority(node, layer);
+    const size = _nodeSize(node, layer, priority);
+    return {
+      layer,
+      labelPriority: priority,
+      important: priority <= 1,
+      nodeWidth: size.width,
+      nodeHeight: size.height,
+      fontSize: size.fontSize,
+    };
+  }
+
+  function _labelPriority(node, layer) {
+    if (layer === "system") return 0;
+    if (node.type === "profile") return 0;
+    if (layer === "runtime" || layer === "projects") return 1;
+    if (["skill", "mcp_server", "cortex_tool", "sovereign_api", "external_dep"].includes(node.type)) return 2;
+    return 3;
+  }
+
+  function _nodeSize(node, layer, priority) {
+    if (layer === "system") return { width: 148, height: 54, fontSize: 12 };
+    if (node.type === "profile") return { width: 118, height: 48, fontSize: 11 };
+    if (layer === "runtime" || layer === "projects") return { width: 108, height: 42, fontSize: 10 };
+    if (priority === 2) return { width: 82, height: 34, fontSize: 9 };
+    return { width: 34, height: 28, fontSize: 9 };
+  }
+
+  function applyLabelDensity() {
+    if (!cy) return;
+    const zoom = cy.zoom();
+    cy.batch(() => {
+      cy.nodes().forEach((node) => {
+        if (node.selected() || node.hasClass("hover")) return;
+        const priority = node.data("labelPriority");
+        const label = priority <= 1 || (priority === 2 && zoom >= 0.85) || zoom >= 1.25
+          ? node.data("shortLabel")
+          : "";
+        node.style("label", label);
+      });
+    });
+  }
+
+  function resetGraphEmphasis() {
+    if (!cy) return;
+    const inSpine = window.__svrntyUmbrella.view === "spine";
+    cy.batch(() => {
+      cy.nodes().style("opacity", 1);
+      cy.edges().style({ "opacity": inSpine ? 0.14 : 0.5, "width": 1 });
+    });
+    applyLabelDensity();
+  }
+
+  function focusNode(node) {
+    if (!cy) return;
+    node.addClass("hover");
+    const neighborhood = node.closedNeighborhood();
+    cy.batch(() => {
+      cy.elements().not(neighborhood).style("opacity", 0.16);
+      neighborhood.nodes().style("opacity", 1);
+      cy.edges().style({ "opacity": 0.05, "width": 1 });
+      node.connectedEdges().style({ "opacity": 0.9, "width": 2 });
+    });
+  }
+
+  function _sourcePath(node) {
+    return String((node && node.source_path) || "");
+  }
+
+  function _docCategory(node) {
+    const path = _sourcePath(node);
+    if (path.includes("/01-ROADMAP/")) return "roadmap";
+    if (path.includes("/02-FRAMEWORK/")) return "framework";
+    if (path.includes("/03-PROTOCOLS/")) return "protocols";
+    if (path.includes("/04-STANDARDS/")) return "standards";
+    if (path.includes("/05-RECIPES/")) return "recipes";
+    if (path.includes("/06-REGISTRY/")) return "registry";
+    if (path.includes("/07-BRAND/")) return "brand";
+    if (path.includes("/08-OUTPUTS/")) return "outputs";
+    if (path.includes("/99-RAW/")) return "raw";
+    return "docs";
+  }
+
+  function _spineLayerKey(node) {
+    const id = node.id || "";
+    const source = _sourcePath(node);
+    if (["readme", "architecture", "cortex-os-framework", "cortex-os-roadmap"].includes(id)) return "system";
+    if (["hermes-webui", "hermes-agent", "llm-gateway"].includes(id) || source.startsWith("hermes-webui/")) return "runtime";
+    if (node.type === "profile") return "profiles";
+    if (node.type === "skill") return "capabilities";
+    if (["mcp_server", "cortex_tool", "sovereign_api", "external_dep", "credential"].includes(node.type)) return "capabilities";
+    if (["bte", "bte-mcp", "adwright", "adwright-mcp", "svrnty-vision", "deep-research", "sandcastle", "pi-code"].includes(id)) return "projects";
+    if (source && !source.startsWith("sot/")) return "projects";
+    if (node.type === "doc") {
+      const cat = _docCategory(node);
+      if (["framework", "protocols", "standards"].includes(cat)) return "governance";
+      return "knowledge";
+    }
+    return "knowledge";
+  }
+
+  function _groupRows(nodes, keyFn) {
+    const groups = new Map();
+    nodes.forEach((node) => {
+      const key = keyFn(node);
+      if (!groups.has(key)) groups.set(key, []);
+      groups.get(key).push(node);
+    });
+    groups.forEach((items) => items.sort((a, b) => String(a.label || a.id).localeCompare(String(b.label || b.id))));
+    return [...groups.entries()].sort((a, b) => String(a[0]).localeCompare(String(b[0])));
+  }
+
+  function _wrapGroupRows(groups, width, minGap) {
+    const rows = [];
+    groups.forEach(([group, items]) => {
+      let row = [];
+      let used = 0;
+      items.forEach((node) => {
+        const need = _estimatedLabelWidth(node) + minGap;
+        if (row.length && used + need > width) {
+          rows.push([group, row]);
+          row = [];
+          used = 0;
+        }
+        row.push(node);
+        used += need;
+      });
+      if (row.length) rows.push([group, row]);
+    });
+    return rows;
+  }
+
+  function _rowPositions(groups, opts) {
+    const positions = {};
+    const width = Math.max(opts.width || 1200, 900);
+    const top = opts.top || 80;
+    const rowGap = opts.rowGap || 120;
+    const minGap = opts.minGap || 78;
+    const rows = _wrapGroupRows(groups, Math.max(width - 180, 720), minGap);
+    rows.forEach(([_, items], rowIndex) => {
+      const totalLabelWidth = items.reduce((sum, node) => sum + _estimatedLabelWidth(node), 0);
+      const rowWidth = Math.max(width - 180, totalLabelWidth + Math.max(0, items.length - 1) * minGap);
+      const startX = (width - rowWidth) / 2;
+      const availableGap = items.length > 1 ? (rowWidth - totalLabelWidth) / (items.length - 1) : 0;
+      let cursor = startX;
+      items.forEach((node, i) => {
+        const labelWidth = _estimatedLabelWidth(node);
+        positions[node.id] = {
+          x: items.length === 1 ? width / 2 : cursor + labelWidth / 2,
+          y: top + rowIndex * rowGap,
+        };
+        cursor += labelWidth + Math.max(minGap, availableGap);
+      });
+    });
+    return positions;
+  }
+
+  function _layerRows(items, layerWidth) {
+    const innerWidth = Math.max(layerWidth - 120, 360);
+    const rows = [];
+    let row = [];
+    let used = 0;
+    items.forEach((node) => {
+      const need = _estimatedLabelWidth(node) + 56;
+      if (row.length && used + need > innerWidth) {
+        rows.push(row);
+        row = [];
+        used = 0;
+      }
+      row.push(node);
+      used += need;
+    });
+    if (row.length) rows.push(row);
+    return rows;
+  }
+
+  function spineLayout(g) {
+    const layerMap = new Map();
+    SPINE_LAYERS.forEach((layer) => layerMap.set(layer.key, []));
+    g.nodes.forEach((node) => {
+      const layer = _spineLayerKey(node);
+      if (!layerMap.has(layer)) layerMap.set("knowledge", []);
+      layerMap.get(layerMap.has(layer) ? layer : "knowledge").push(node);
+    });
+    layerMap.forEach((items) => {
+      items.sort((a, b) => {
+        const av = _labelPriority(a, _spineLayerKey(a));
+        const bv = _labelPriority(b, _spineLayerKey(b));
+        return av - bv || String(a.label || a.id).localeCompare(String(b.label || b.id));
+      });
+    });
+
+    const positions = {};
+    const bands = [];
+    let y = 80;
+    SPINE_LAYERS.forEach((layer, layerIndex) => {
+      const allItems = layerMap.get(layer.key) || [];
+      if (!allItems.length) return;
+      const collapsed = quietLayers.has(layer.key) && !disclosedLayers.has(layer.key);
+      const items = collapsed ? [] : allItems;
+      if (collapsed) {
+        const layerWidth = Math.max(900, Math.min(1800, layer.baseWidth || 900));
+        const x1 = -layerWidth / 2;
+        const x2 = layerWidth / 2;
+        const y1 = y;
+        const y2 = y + 52;
+        bands.push({ key: layer.key, label: layer.label, count: allItems.length, color: layer.color, x1, x2, y1, y2, collapsed: true });
+        y = y2 + 42;
+        return;
+      }
+      const density = items.reduce((sum, node) => sum + _estimatedLabelWidth(node), 0);
+      const layerWidth = Math.min(4200, Math.max(layer.baseWidth || 900, density * 0.72));
+      const rows = _layerRows(items, layerWidth);
+      const bandHeight = Math.max(138, rows.length * 92 + 74);
+      const x1 = -layerWidth / 2;
+      const x2 = layerWidth / 2;
+      const y1 = y;
+      const y2 = y + bandHeight;
+      bands.push({ key: layer.key, label: layer.label, count: items.length, color: layer.color, x1, x2, y1, y2, collapsed: false });
+      rows.forEach((row, rowIndex) => {
+        const rowWidth = row.reduce((sum, node) => sum + _estimatedLabelWidth(node), 0) + Math.max(0, row.length - 1) * 58;
+        let cursor = -rowWidth / 2;
+        row.forEach((node) => {
+          const w = _estimatedLabelWidth(node);
+          positions[node.id] = {
+            x: cursor + w / 2,
+            y: y1 + 78 + rowIndex * 92,
+          };
+          cursor += w + 58;
+        });
+      });
+      y = y2 + 70;
+    });
+    return { positions, bands };
+  }
+
+  function spinePositions(g) {
+    return spineLayout(g).positions;
+  }
+
+  function orgPositions(g) {
+    const bounds = document.getElementById("cy").getBoundingClientRect();
+    const profiles = g.nodes.filter((n) => n.type === "profile");
+    const profileIds = new Set(profiles.map((p) => p.id.replace(/-planb$/, "")));
+    const groups = [["system", g.nodes.filter((n) => ["readme", "architecture", "cortex-os-framework"].includes(n.id))]];
+    groups.push(["profiles", profiles]);
+    profiles.forEach((profile) => {
+      const shortId = profile.id.replace(/-planb$/, "");
+      groups.push([profile.id + "-skills", g.nodes.filter((n) =>
+        n.type === "skill" && (n.id.startsWith(profile.id + "::") || n.id.startsWith(shortId + "-"))
+      )]);
+    });
+    groups.push(["tools", g.nodes.filter((n) => ["mcp_server", "cortex_tool", "sovereign_api", "external_dep"].includes(n.type))]);
+    groups.push(["credentials", g.nodes.filter((n) => n.type === "credential")]);
+    groups.push(["sot", g.nodes.filter((n) => n.type === "doc" && !["readme", "architecture", "cortex-os-framework"].includes(n.id))]);
+    return _rowPositions(groups.filter(([, items]) => items.length), {
+      width: bounds.width,
+      top: 70,
+      rowGap: 120,
+      minGap: 86,
+    });
+  }
+
+  function mindmapPositions(g) {
+    const bounds = document.getElementById("cy").getBoundingClientRect();
+    const width = Math.max(bounds.width, 900);
+    const height = Math.max(bounds.height, 700);
+    const center = { x: width / 2, y: height / 2 };
+    const positions = {};
+    const rootIds = new Set(["readme", "architecture", "cortex-os-framework"]);
+    const roots = g.nodes.filter((n) => rootIds.has(n.id));
+    roots.forEach((node, i) => {
+      positions[node.id] = { x: center.x - 80 + i * 80, y: center.y };
+    });
+    const groups = _groupRows(g.nodes.filter((n) => !rootIds.has(n.id)), (n) => n.type || "other");
+    const maxRadius = Math.min(width, height) * 0.42;
+    groups.forEach(([_, items], groupIndex) => {
+      const angleStart = (Math.PI * 2 * groupIndex) / groups.length;
+      const angleEnd = (Math.PI * 2 * (groupIndex + 1)) / groups.length;
+      items.forEach((node, i) => {
+        const t = (i + 1) / (items.length + 1);
+        const angle = angleStart + (angleEnd - angleStart) * t;
+        const ring = Math.floor(i / Math.max(1, Math.ceil(items.length / 4)));
+        const radius = maxRadius * (0.35 + 0.16 * Math.min(ring, 4));
+        positions[node.id] = {
+          x: center.x + Math.cos(angle) * radius,
+          y: center.y + Math.sin(angle) * radius,
+        };
+      });
+    });
+    return positions;
+  }
+
+  function clearLayerOverlay() {
+    layerOverlayState = null;
+    const overlay = document.getElementById("layerOverlay");
+    if (overlay) overlay.innerHTML = "";
+  }
+
+  function renderLayerOverlay(bands) {
+    const overlay = document.getElementById("layerOverlay");
+    if (!overlay || !cy) return;
+    layerOverlayState = bands;
+    overlay.innerHTML = bands.map((band) =>
+      '<div class="layer-band' + (band.collapsed ? ' collapsed' : '') + '" data-layer="' + band.key + '">' +
+        '<div class="layer-band-label">' +
+          '<span>' + band.label + '</span>' +
+          '<span class="count">' + band.count + (band.collapsed ? ' hidden' : ' nodes') + '</span>' +
+        '</div>' +
+      '</div>'
+    ).join("");
+    updateLayerOverlay();
+  }
+
+  function updateLayerOverlay() {
+    if (!layerOverlayState || !cy) return;
+    const overlay = document.getElementById("layerOverlay");
+    if (!overlay) return;
+    const z = cy.zoom();
+    const pan = cy.pan();
+    overlay.querySelectorAll(".layer-band").forEach((el, index) => {
+      const band = layerOverlayState[index];
+      if (!band) return;
+      const left = band.x1 * z + pan.x;
+      const top = band.y1 * z + pan.y;
+      const width = (band.x2 - band.x1) * z;
+      const height = (band.y2 - band.y1) * z;
+      el.style.left = left + "px";
+      el.style.top = top + "px";
+      el.style.width = width + "px";
+      el.style.height = height + "px";
+      el.style.borderColor = band.color + "44";
+      el.style.background = band.collapsed
+        ? "linear-gradient(90deg, " + band.color + "0f, rgba(21,24,31,0.20))"
+        : "linear-gradient(90deg, " + band.color + "14, rgba(21,24,31,0.34))";
+    });
+  }
+
+  function setActiveView(name) {
+    document.querySelectorAll("button[data-layout], button[data-view]").forEach((button) => {
+      button.classList.toggle("active", button.dataset.layout === name || button.dataset.view === name);
+    });
+    window.__svrntyUmbrella.view = name;
+  }
+
+  function runPresetView(name) {
+    if (!cy || !graph) return;
+    let positions = null;
+    if (name === "spine") {
+      const layout = spineLayout(graph);
+      positions = layout.positions;
+      renderLayerOverlay(layout.bands);
+    } else {
+      clearLayerOverlay();
+      positions = name === "org" ? orgPositions(graph) : mindmapPositions(graph);
+    }
+    setActiveView(name);
+    cy.layout({
+      name: "preset",
+      positions: (node) => positions[node.id()] || node.position(),
+      animate: true,
+      fit: true,
+      padding: 48,
+    }).run();
+    setTimeout(resetGraphEmphasis, 250);
+    setTimeout(updateLayerOverlay, 260);
   }
 
   async function openSidePanel(node) {
@@ -240,14 +706,20 @@
     document.querySelectorAll("button[data-layout]").forEach(b => {
       b.addEventListener("click", () => {
         const name = b.dataset.layout;
+        clearLayerOverlay();
+        setActiveView(name);
         const opts = name === "cose"
           ? { name, animate: true, idealEdgeLength: 80, nodeRepulsion: 12000 }
           : name === "breadthfirst"
             ? { name, animate: true, directed: true, padding: 10 }
             : { name, animate: true };
         cy.layout(opts).run();
+        setTimeout(resetGraphEmphasis, 250);
       });
     });
+    document.querySelectorAll("button[data-view]").forEach(b => {
+      b.addEventListener("click", () => runPresetView(b.dataset.view));
+    });
     const search = document.getElementById("search");
     search.addEventListener("input", () => {
       const q = search.value.trim().toLowerCase();
@@ -268,11 +740,14 @@
       renderFilters(graph);
       renderGraph(graph);
       bindControls();
+      runPresetView("spine");
+      applyDefaultDisclosure();
       window.__svrntyUmbrella = {
         ready: true,
         error: null,
         nodes: graph.nodes.length,
         edges: graph.edges.length,
+        view: window.__svrntyUmbrella.view || "spine",
       };
     } catch (e) {
       document.getElementById("stats").textContent = "load failed: " + e.message;
diff --git a/tests/unit/test_umbrella_static.py b/tests/unit/test_umbrella_static.py
new file mode 100644
index 0000000..f42b5d1
--- /dev/null
+++ b/tests/unit/test_umbrella_static.py
@@ -0,0 +1,47 @@
+"""Static checks for the umbrella graph browser assets."""
+
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+HTML = ROOT / "static" / "umbrella.html"
+JS = ROOT / "static" / "umbrella.js"
+
+
+def test_umbrella_exposes_spine_org_and_mindmap_controls():
+    html = HTML.read_text()
+    assert 'data-view="spine"' in html
+    assert 'data-view="org"' in html
+    assert 'data-view="mindmap"' in html
+    assert 'id="disclosure"' in html
+
+
+def test_umbrella_implements_semantic_preset_views():
+    js = JS.read_text()
+    html = HTML.read_text()
+    assert 'id="layerOverlay"' in html
+    assert "const SPINE_LAYERS" in js
+    assert "Governance / Protocols" in js
+    assert "function spineLayout" in js
+    assert "function spinePositions" in js
+    assert "function orgPositions" in js
+    assert "function mindmapPositions" in js
+    assert 'name: "preset"' in js
+    assert "positions: (node) => positions[node.id()] || node.position()" in js
+    assert "window.__svrntyUmbrella.view" in js
+
+
+def test_umbrella_has_collision_reduction_rules():
+    js = JS.read_text()
+    assert "function _estimatedLabelWidth" in js
+    assert "function _wrapGroupRows" in js
+    assert "function applyLabelDensity" in js
+    assert "function renderLayerOverlay" in js
+    assert "function applyDefaultDisclosure" in js
+    assert 'new Set(["credential"])' in js
+    assert 'new Set(["knowledge"])' in js
+    assert "function toggleLayerDisclosure" in js
+    assert "function resetGraphEmphasis" in js
+    assert "function focusNode" in js
+    assert 'selector: "node.hover"' in js
+    assert 'cy.on("zoom", () => applyLabelDensity())' in js
+    assert "window.cy = cy" in js