feat(component): CouncilMark — generative member sigil

SVG component, sizes sm (48) / md (100) / lg (200) on a 120 viewBox.

12 quarter positions on a circle, i=0 = current quarter at 12 o'clock,
going clockwise into the past. A position is lit iff the member has a
roadmap_attribution to an item with shipped_at in that quarter. Pulse
votes do NOT light a quarter — the sigil represents consequential
contribution, not participation.

Visual layers:
- faint dotted outer ring rotating 90s linear
- small grey dots on empty quarters
- terracotta-filled polygon (15% fill) connecting lit dots, draws in
  over 1.6s on mount via stroke-dasharray
- terracotta dots on lit quarters with staggered 2.4s breathing
- serif italic initials in the centre, walnut secondary

Uses --pigment-terracotta instead of the spec's coral — no new tokens.
Honours prefers-reduced-motion.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/CouncilMark.astro

@@ -0,0 +1,145 @@
+---
+import type { UserPublic } from '../lib/db';
+import { getLitQuarters } from '../lib/db';
+
+interface Props {
+  member: UserPublic;
+  size?: 'sm' | 'md' | 'lg';
+}
+
+const { member, size = 'md' } = Astro.props;
+
+const SIZES = { sm: 48, md: 100, lg: 200 } as const;
+const px = SIZES[size];
+
+// 12 positions on a circle, i=0 = current quarter at 12 o'clock, going clockwise
+// into the past. A position is "lit" iff the member has a roadmap_attribution
+// to an item with shipped_at falling in that quarter. Pulse votes do NOT light.
+const lit = getLitQuarters(member.id);
+const litArr = [...lit].sort((a, b) => a - b);
+
+const CENTER = 60;
+const RADIUS = 42;
+function pointAt(i: number) {
+  const angle = -Math.PI / 2 + (i * Math.PI * 2) / 12;
+  return { x: CENTER + RADIUS * Math.cos(angle), y: CENTER + RADIUS * Math.sin(angle) };
+}
+
+const litPoints = litArr.map(pointAt);
+const polygonPoints = litPoints.length >= 3
+  ? litPoints.map(p => `${p.x.toFixed(2)},${p.y.toFixed(2)}`).join(' ')
+  : null;
+
+function initials(name: string): string {
+  const parts = name.trim().split(/\s+/);
+  if (parts.length === 1) return (parts[0][0] ?? '').toUpperCase();
+  return ((parts[0][0] ?? '') + (parts[parts.length - 1][0] ?? '')).toUpperCase();
+}
+---
+<svg
+  class:list={['council-mark', `cm-${size}`]}
+  width={px}
+  height={px}
+  viewBox="0 0 120 120"
+  role="img"
+  aria-label={`${member.name} — council mark`}
+>
+  <g class="cm-ring">
+    <circle cx="60" cy="60" r="54" fill="none" stroke="currentColor"
+            stroke-width="0.5" stroke-dasharray="1 4" stroke-linecap="round"
+            opacity="0.35" />
+  </g>
+
+  {Array.from({ length: 12 }).map((_, i) => {
+    if (lit.has(i)) return null;
+    const p = pointAt(i);
+    return <circle cx={p.x} cy={p.y} r="1.5" fill="var(--on-surface-muted)" opacity="0.45" />;
+  })}
+
+  {polygonPoints && (
+    <polygon
+      points={polygonPoints}
+      fill="var(--pigment-terracotta)"
+      fill-opacity="0.15"
+      stroke="var(--pigment-terracotta)"
+      stroke-width="0.8"
+      stroke-opacity="0.6"
+      class="cm-polygon"
+    />
+  )}
+
+  {litArr.map((i, idx) => {
+    const p = pointAt(i);
+    return (
+      <circle
+        cx={p.x} cy={p.y} r="3.5"
+        fill="var(--pigment-terracotta)"
+        class="cm-dot"
+        style={`animation-delay: ${(idx * 0.4).toFixed(2)}s`}
+      />
+    );
+  })}
+
+  <text
+    x="60" y="60"
+    text-anchor="middle"
+    dominant-baseline="central"
+    class="cm-initials"
+  >{initials(member.name)}</text>
+</svg>
+
+<style>
+  .council-mark {
+    display: block;
+    color: var(--on-surface-muted);
+  }
+
+  .cm-ring {
+    transform-origin: 60px 60px;
+    transform-box: view-box;
+    animation: cm-ring-spin 90s linear infinite;
+  }
+
+  @keyframes cm-ring-spin {
+    from { transform: rotate(0deg);   }
+    to   { transform: rotate(360deg); }
+  }
+
+  .cm-polygon {
+    stroke-dasharray: 2000;
+    stroke-dashoffset: 2000;
+    animation: cm-polygon-draw 1.6s var(--ease-standard) forwards;
+  }
+
+  @keyframes cm-polygon-draw {
+    to { stroke-dashoffset: 0; }
+  }
+
+  .cm-dot {
+    animation: cm-dot-breathe 2.4s ease-in-out infinite;
+  }
+
+  @keyframes cm-dot-breathe {
+    0%, 100% { opacity: 1;   }
+    50%      { opacity: 0.5; }
+  }
+
+  .cm-initials {
+    font-family: var(--font-serif);
+    font-style: italic;
+    font-weight: 400;
+    fill: var(--secondary);
+  }
+
+  .cm-sm .cm-initials { font-size: 12px; }
+  .cm-md .cm-initials { font-size: 16px; }
+  .cm-lg .cm-initials { font-size: 24px; }
+
+  /* sm scale: drop the polygon — too dense at 48px and dots speak for themselves */
+  .cm-sm .cm-polygon { display: none; }
+
+  @media (prefers-reduced-motion: reduce) {
+    .cm-ring, .cm-polygon, .cm-dot { animation: none; }
+    .cm-polygon { stroke-dashoffset: 0; }
+  }
+</style>