Update web viewer for router mesh topology (ADR-0019)

Remove all xbar/bridge rendering from cube detail view.
Replace 8 HBM slices with single HBM_CTRL block.
Add green dotted lines showing router-to-HBM connectivity.
Update legend, event animation, and PE view NOC destinations.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/kernbench/web/static/index.html

@@ -26,8 +26,8 @@
   --pe-stroke: #a855f7;
   --io-fill: #3d2b1f;
   --io-stroke: #f97316;
-  --xbar-fill: #1f2d3d;
+  --router-fill: #1f2d3d;
-  --xbar-stroke: #06b6d4;
+  --router-stroke: #06b6d4;
   --link-color: #475569;
   --link-active: #3b82f6;
 }
@@ -405,8 +405,8 @@ body {
         PE
       </div>
       <div class="legend-item">
-        <div class="legend-swatch" style="background:var(--xbar-fill);border-color:var(--xbar-stroke)"></div>
+        <div class="legend-swatch" style="background:var(--router-fill);border-color:var(--router-stroke)"></div>
-        XBAR / NOC
+        Router Mesh
       </div>
     </div>
 
@@ -716,7 +716,7 @@ function drawCubeNode(svg, x, y, idx) {
     g.appendChild(pt);
   }
 
-  // Center block: xbar + NOC
+  // Center block: router mesh
   g.appendChild(svgEl("rect", {
     x: x + 30, y: y + 30, width: CUBE_W - 60, height: CUBE_H - 56,
     rx: 3, fill: "#1f2d3d", stroke: "#06b6d466", "stroke-width": 0.8
@@ -728,7 +728,7 @@ function drawCubeNode(svg, x, y, idx) {
     "font-size": "7",
     fill: "#06b6d4aa"
   });
-  xt.textContent = "NOC+XBAR";
+  xt.textContent = "Router Mesh";
   g.appendChild(xt);
 
   // HBM indicators (top and bottom)
@@ -871,51 +871,6 @@ function drawCubeView(svg, cubeIdx) {
     }
   }
 
-  // ── PE router → XBAR_TOP paths (90-degree angled, matching reference) ──
-  // r0c0 → XBAR_TOP left: down then right
-  const xbarTopY = OY + 145; // reference: rect at y=145
-  const xbarBotY = OY + 355; // reference: rect at y=355
-  const xbarX = OX + 150;    // reference: x=150
-  const xbarW = 400;         // reference: width=400
-
-  svg.appendChild(svgEl("path", {
-    d: `M ${OX} ${OY+16} V ${xbarTopY+6} H ${xbarX}`,
-    fill: "none", stroke: "#f97316", "stroke-width": 1.5, "stroke-dasharray": "4,3"
-  }));
-  svg.appendChild(svgEl("path", {
-    d: `M ${OX+140} ${OY+16} V ${xbarTopY} H ${xbarX}`,
-    fill: "none", stroke: "#f97316", "stroke-width": 1.5, "stroke-dasharray": "4,3"
-  }));
-  svg.appendChild(svgEl("path", {
-    d: `M ${OX+560} ${OY+107} V ${xbarTopY} H ${xbarX+xbarW}`,
-    fill: "none", stroke: "#f97316", "stroke-width": 1.5, "stroke-dasharray": "4,3"
-  }));
-  svg.appendChild(svgEl("path", {
-    d: `M ${OX+700} ${OY+107} V ${xbarTopY+6} H ${xbarX+xbarW}`,
-    fill: "none", stroke: "#f97316", "stroke-width": 1.5, "stroke-dasharray": "4,3"
-  }));
-
-  // ── XBAR_TOP bar ──
-  svg.appendChild(svgEl("rect", {
-    x: xbarX, y: xbarTopY, width: xbarW, height: 22,
-    rx: 5, fill: "#f97316", stroke: "#ea580c", "stroke-width": 2
-  }));
-  const xtT = svgEl("text", {
-    x: xbarX + xbarW / 2, y: xbarTopY + 15, "text-anchor": "middle",
-    "font-family": "monospace", "font-size": "9", "font-weight": "bold", fill: "white"
-  });
-  xtT.textContent = "XBAR_TOP | xbar_v1 | 2.0ns";
-  svg.appendChild(xtT);
-
-  // ── XBAR_TOP → HBM0-3 arrows ──
-  const hbmArrowXs = [OX + 225, OX + 320, OX + 415, OX + 475];
-  for (const ax of hbmArrowXs) {
-    svg.appendChild(svgEl("line", {
-      x1: ax, y1: xbarTopY + 22, x2: ax, y2: OY + 198,
-      stroke: "#059669", "stroke-width": 1.5
-    }));
-  }
-
   // ── HBM ZONE ──
   const hbmZoneX = OX + 145, hbmZoneY = OY + 195, hbmZoneW = 410, hbmZoneH = 152;
   svg.appendChild(svgEl("rect", {
@@ -926,181 +881,71 @@ function drawCubeView(svg, cubeIdx) {
     x: hbmZoneX + hbmZoneW / 2, y: hbmZoneY + 16, "text-anchor": "middle",
     "font-family": "monospace", "font-size": "9", "font-weight": "bold", fill: "#047857"
   });
-  hzmLabel.textContent = "HBM 9.0 x 5.0 mm | hbm_ctrl_v1 x 8";
+  hzmLabel.textContent = "HBM 9.0 x 5.0 mm | hbm_ctrl_v1";
   svg.appendChild(hzmLabel);
 
-  // HBM0-3 (top row)
+  // Single HBM_CTRL block (centered in HBM zone)
-  const hbmSliceW = 85, hbmSliceH = 28;
+  const hbmCtrlG = svgEl("g", { class: "node-group", "data-id": "hbm_ctrl" });
-  const hbmTopSlices = [
+  hbmCtrlG.appendChild(svgEl("rect", {
-    { x: OX + 168, label: "HBM0" }, { x: OX + 260, label: "HBM1" },
+    x: hbmZoneX + 40, y: hbmZoneY + 28, width: hbmZoneW - 80, height: 40,
-    { x: OX + 352, label: "HBM2" }, { x: OX + 444, label: "HBM3" }
+    rx: 6, fill: "#047857", stroke: "#065f46", "stroke-width": 1.5
-  ];
-  for (const hs of hbmTopSlices) {
-    const g = svgEl("g", { class: "node-group", "data-id": hs.label.toLowerCase() });
-    g.appendChild(svgEl("rect", {
-      x: hs.x, y: hbmZoneY + 23, width: hbmSliceW, height: hbmSliceH,
-      rx: 4, fill: "#047857", stroke: "#065f46", "stroke-width": 1.5
   }));
-    const t = svgEl("text", {
+  const hbmCtrlT = svgEl("text", {
-      x: hs.x + hbmSliceW / 2, y: hbmZoneY + 23 + 18, "text-anchor": "middle",
+    x: hbmZoneX + hbmZoneW / 2, y: hbmZoneY + 53, "text-anchor": "middle",
-      "font-family": "monospace", "font-size": "8", "font-weight": "bold", fill: "white"
+    "font-family": "monospace", "font-size": "10", "font-weight": "bold", fill: "white"
   });
-    t.textContent = hs.label;
+  hbmCtrlT.textContent = "HBM_CTRL";
-    g.appendChild(t);
+  hbmCtrlG.appendChild(hbmCtrlT);
-    svg.appendChild(g);
+  svg.appendChild(hbmCtrlG);
-  }
 
   // Exclusion zone label
   const hexLabel = svgEl("text", {
-    x: hbmZoneX + hbmZoneW / 2, y: hbmZoneY + 75, "text-anchor": "middle",
+    x: hbmZoneX + hbmZoneW / 2, y: hbmZoneY + 85, "text-anchor": "middle",
     "font-family": "monospace", "font-size": "7", fill: "#ef4444aa"
   });
   hexLabel.textContent = "Router exclusion: r2c2, r2c3, r3c2, r3c3";
   svg.appendChild(hexLabel);
 
-  // HBM4-7 (bottom row)
+  // "All routers connect to HBM" annotation
-  const hbmBotSlices = [
+  const hbmAnnot = svgEl("text", {
-    { x: OX + 168, label: "HBM4" }, { x: OX + 260, label: "HBM5" },
+    x: hbmZoneX + hbmZoneW / 2, y: hbmZoneY + 100, "text-anchor": "middle",
-    { x: OX + 352, label: "HBM6" }, { x: OX + 444, label: "HBM7" }
+    "font-family": "monospace", "font-size": "6", fill: "#059669aa"
+  });
+  hbmAnnot.textContent = "All routers → HBM_CTRL (mesh-connected)";
+  svg.appendChild(hbmAnnot);
+
+  // ── HBM connectivity indicators (thin green dotted lines from edge routers to HBM zone) ──
+  // Draw thin green dotted lines from routers adjacent to HBM zone down/up to HBM
+  const hbmConnRouters = [
+    { r: 1, c: 2 }, { r: 1, c: 3 },  // top edge of HBM zone
+    { r: 4, c: 2 }, { r: 4, c: 3 },  // bottom edge of HBM zone
+    { r: 2, c: 1 }, { r: 3, c: 1 },  // left edge of HBM zone
+    { r: 2, c: 4 }, { r: 3, c: 4 },  // right edge of HBM zone
   ];
-  for (const hs of hbmBotSlices) {
+  for (const hr of hbmConnRouters) {
-    const g = svgEl("g", { class: "node-group", "data-id": hs.label.toLowerCase() });
+    const rp = rXY(hr.r, hr.c);
-    g.appendChild(svgEl("rect", {
+    // Draw line toward the HBM zone center
-      x: hs.x, y: hbmZoneY + hbmZoneH - hbmSliceH - 23 + 10, width: hbmSliceW, height: hbmSliceH,
+    const hbmCenterX = hbmZoneX + hbmZoneW / 2;
-      rx: 4, fill: "#065f46", stroke: "#064e3b", "stroke-width": 1.5
+    const hbmCenterY = hbmZoneY + hbmZoneH / 2;
-    }));
+    // Compute endpoint clipped to HBM zone edge
-    const t = svgEl("text", {
+    let ex = hbmCenterX, ey = hbmCenterY;
-      x: hs.x + hbmSliceW / 2, y: hbmZoneY + hbmZoneH - hbmSliceH - 23 + 10 + 18, "text-anchor": "middle",
+    if (hr.r <= 1) { ey = hbmZoneY; ex = rp.x; }       // top routers → top of HBM zone
-      "font-family": "monospace", "font-size": "8", "font-weight": "bold", fill: "white"
+    else if (hr.r >= 4) { ey = hbmZoneY + hbmZoneH; ex = rp.x; } // bottom routers → bottom of HBM zone
-    });
+    else if (hr.c <= 1) { ex = hbmZoneX; ey = rp.y; }   // left routers → left of HBM zone
-    t.textContent = hs.label;
+    else { ex = hbmZoneX + hbmZoneW; ey = rp.y; }       // right routers → right of HBM zone
-    g.appendChild(t);
-    svg.appendChild(g);
-  }
-
-  // ── XBAR_BOT → HBM4-7 arrows (upward) ──
-  for (const ax of hbmArrowXs) {
     svg.appendChild(svgEl("line", {
-      x1: ax, y1: xbarBotY, x2: ax, y2: OY + 315,
+      x1: rp.x, y1: rp.y, x2: ex, y2: ey,
-      stroke: "#059669", "stroke-width": 1.5
+      stroke: "#05966988", "stroke-width": 1, "stroke-dasharray": "3,3"
     }));
   }
 
-  // ── XBAR_BOT bar ──
-  svg.appendChild(svgEl("rect", {
-    x: xbarX, y: xbarBotY, width: xbarW, height: 22,
-    rx: 5, fill: "#f97316", stroke: "#ea580c", "stroke-width": 2
-  }));
-  const xbT = svgEl("text", {
-    x: xbarX + xbarW / 2, y: xbarBotY + 15, "text-anchor": "middle",
-    "font-family": "monospace", "font-size": "9", "font-weight": "bold", fill: "white"
-  });
-  xbT.textContent = "XBAR_BOT | xbar_v1 | 2.0ns";
-  svg.appendChild(xbT);
-
-  // ── PE router → XBAR_BOT paths (90-degree angled) ──
-  svg.appendChild(svgEl("path", {
-    d: `M ${OX} ${OY+409} V ${xbarBotY+16} H ${xbarX}`,
-    fill: "none", stroke: "#f97316", "stroke-width": 1.5, "stroke-dasharray": "4,3"
-  }));
-  svg.appendChild(svgEl("path", {
-    d: `M ${OX+140} ${OY+409} V ${xbarBotY+10} H ${xbarX}`,
-    fill: "none", stroke: "#f97316", "stroke-width": 1.5, "stroke-dasharray": "4,3"
-  }));
-  svg.appendChild(svgEl("path", {
-    d: `M ${OX+560} ${OY+508} V ${xbarBotY+10} H ${xbarX+xbarW}`,
-    fill: "none", stroke: "#f97316", "stroke-width": 1.5, "stroke-dasharray": "4,3"
-  }));
-  svg.appendChild(svgEl("path", {
-    d: `M ${OX+700} ${OY+508} V ${xbarBotY+16} H ${xbarX+xbarW}`,
-    fill: "none", stroke: "#f97316", "stroke-width": 1.5, "stroke-dasharray": "4,3"
-  }));
-
-  // ── BRIDGES (purple/violet, matching reference) ──
-  const brgLeftX = OX + 100, brgRightX = OX + 600;
-  // Left bridge vertical line
-  svg.appendChild(svgEl("line", {
-    x1: brgLeftX, y1: xbarTopY + 10, x2: brgLeftX, y2: xbarBotY + 12,
-    stroke: "#a78bfa", "stroke-width": 2.5, "stroke-dasharray": "8,4"
-  }));
-  // Left bridge horizontal stubs
-  svg.appendChild(svgEl("line", {
-    x1: brgLeftX, y1: xbarTopY + 6, x2: xbarX, y2: xbarTopY + 6,
-    stroke: "#a78bfa", "stroke-width": 2, "stroke-dasharray": "6,3"
-  }));
-  svg.appendChild(svgEl("line", {
-    x1: brgLeftX, y1: xbarBotY + 16, x2: xbarX, y2: xbarBotY + 16,
-    stroke: "#a78bfa", "stroke-width": 2, "stroke-dasharray": "6,3"
-  }));
-  // Left bridge label
-  svg.appendChild(svgEl("rect", {
-    x: brgLeftX - 28, y: OY + 248, width: 56, height: 30,
-    rx: 4, fill: "#1e1b4b", stroke: "#a78bfa", "stroke-width": 1.5
-  }));
-  let bt = svgEl("text", {
-    x: brgLeftX, y: OY + 259, "text-anchor": "middle",
-    "font-family": "monospace", "font-size": "6", "font-weight": "bold", fill: "#a78bfa"
-  });
-  bt.textContent = "XBAR BRG";
-  svg.appendChild(bt);
-  bt = svgEl("text", {
-    x: brgLeftX, y: OY + 272, "text-anchor": "middle",
-    "font-family": "monospace", "font-size": "7", "font-weight": "bold", fill: "#a78bfa"
-  });
-  bt.textContent = "LEFT";
-  svg.appendChild(bt);
-  bt = svgEl("text", {
-    x: brgLeftX - 36, y: OY + 263, "text-anchor": "end",
-    "font-family": "monospace", "font-size": "6", fill: "#a78bfa88"
-  });
-  bt.textContent = "3mm";
-  svg.appendChild(bt);
-
-  // Right bridge vertical line
-  svg.appendChild(svgEl("line", {
-    x1: brgRightX, y1: xbarTopY + 10, x2: brgRightX, y2: xbarBotY + 12,
-    stroke: "#a78bfa", "stroke-width": 2.5, "stroke-dasharray": "8,4"
-  }));
-  // Right bridge horizontal stubs
-  svg.appendChild(svgEl("line", {
-    x1: brgRightX, y1: xbarTopY + 6, x2: xbarX + xbarW, y2: xbarTopY + 6,
-    stroke: "#a78bfa", "stroke-width": 2, "stroke-dasharray": "6,3"
-  }));
-  svg.appendChild(svgEl("line", {
-    x1: brgRightX, y1: xbarBotY + 16, x2: xbarX + xbarW, y2: xbarBotY + 16,
-    stroke: "#a78bfa", "stroke-width": 2, "stroke-dasharray": "6,3"
-  }));
-  // Right bridge label
-  svg.appendChild(svgEl("rect", {
-    x: brgRightX - 28, y: OY + 248, width: 56, height: 30,
-    rx: 4, fill: "#1e1b4b", stroke: "#a78bfa", "stroke-width": 1.5
-  }));
-  bt = svgEl("text", {
-    x: brgRightX, y: OY + 259, "text-anchor": "middle",
-    "font-family": "monospace", "font-size": "6", "font-weight": "bold", fill: "#a78bfa"
-  });
-  bt.textContent = "XBAR BRG";
-  svg.appendChild(bt);
-  bt = svgEl("text", {
-    x: brgRightX, y: OY + 272, "text-anchor": "middle",
-    "font-family": "monospace", "font-size": "7", "font-weight": "bold", fill: "#a78bfa"
-  });
-  bt.textContent = "RIGHT";
-  svg.appendChild(bt);
-  bt = svgEl("text", {
-    x: brgRightX + 36, y: OY + 263,
-    "font-family": "monospace", "font-size": "6", fill: "#a78bfa88"
-  });
-  bt.textContent = "3mm";
-  svg.appendChild(bt);
-
   // ── M_CPU (r2c0) and SRAM (r3c0) labels ──
   const mcpuP = rXY(2, 0);
   svg.appendChild(svgEl("rect", {
     x: mcpuP.x - 42, y: mcpuP.y + 18, width: 84, height: 18,
     rx: 4, fill: "#f59e0b", stroke: "#d97706", "stroke-width": 1.5
   }));
-  bt = svgEl("text", {
+  let bt = svgEl("text", {
     x: mcpuP.x, y: mcpuP.y + 31, "text-anchor": "middle",
     "font-family": "monospace", "font-size": "8", "font-weight": "bold", fill: "white"
   });
@@ -1358,8 +1203,7 @@ function drawCubeView(svg, cubeIdx) {
     { color: "#e2e8f0", label: "Relay", textColor: "#475569" },
     { color: "#8b5cf6", label: "UCIe Router" },
     { color: "#f59e0b", label: "M_CPU/SRAM" },
-    { color: "#a78bfa", label: "Bridge", type: "line" },
+    { color: "#059669", label: "HBM Link", type: "line" },
-    { color: "#f97316", label: "XBAR", type: "rect" },
     { color: "#047857", label: "HBM Ctrl", type: "rect" },
     { color: "#ef4444", label: "PE (~5mm2)", type: "rect" },
     { color: "#8b5cf6", label: "UCIe Port", type: "rect", rectFill: "#1e1b4b" },
@@ -1394,7 +1238,7 @@ function drawCubeView(svg, cubeIdx) {
   const dpT = svgEl("text", {
     x: 60, y: legY + 24, "font-family": "monospace", "font-size": "7", fill: "#64748b"
   });
-  dpT.textContent = "Data: PE_DMA→NOC→XBAR→HBM | Cross-half: XBAR_TOP→Bridge(3mm)→XBAR_BOT→HBM4-7";
+  dpT.textContent = "Data: PE_DMA → Router Mesh → HBM_CTRL | All traffic routed through 6x6 mesh";
   svg.appendChild(dpT);
 }
 
@@ -1454,7 +1298,7 @@ function drawPeView(svg, cubeIdx, peIdx) {
 
   // NOC destinations (inside NOC column)
   const nocDests = [
-    { label: "XBAR", sub: "→ HBM", y: nocTop + 50,  fill: "#f97316", bg: "#3d2b1f" },
+    { label: "HBM",  sub: "ctrl",  y: nocTop + 50,  fill: "#059669", bg: "#052e16" },
     { label: "SRAM", sub: "128x4",  y: nocTop + 86,  fill: "#f59e0b", bg: "#3d2b1f" },
     { label: "UCIe", sub: "inter",  y: nocTop + 122, fill: "#8b5cf6", bg: "#1e1b4b" },
     { label: "M_CPU", sub: "cmd",   y: nocTop + 158, fill: "#f59e0b", bg: "#3d2b1f" },
@@ -1967,7 +1811,7 @@ function applyHotPaths(svg, t) {
     }
 
   } else if (currentView === "cube") {
-    // ── CUBE VIEW: highlight router mesh links + XBAR paths ──
+    // ── CUBE VIEW: highlight router mesh links ──
     const linkTraffic = {};
     for (const hop of activeHops) {
       const linkId = hopToCubeLink(hop);
@@ -1984,16 +1828,13 @@ function applyHotPaths(svg, t) {
         inflight++;
       }
     }
-    // Highlight XBAR/HBM components referenced in events
+    // Highlight HBM component referenced in events
     const activeProcesses = allEvents.filter(e =>
       e.type === "process" && e.t_ns <= t && e.t_ns >= t - 30
     );
     for (const proc of activeProcesses) {
       const comp = proc.component || "";
-      if (comp.includes("xbar_top")) highlightComponent(svg, "xbar_top");
+      if (comp.includes("hbm_ctrl")) highlightComponent(svg, "hbm_ctrl");
-      if (comp.includes("xbar_bot")) highlightComponent(svg, "xbar_bot");
-      const hbmMatch = comp.match(/hbm_ctrl\.slice(\d+)/);
-      if (hbmMatch) highlightComponent(svg, `hbm${hbmMatch[1]}`);
     }
 
   } else if (currentView === "pe") {