Implement Grumman collection and private stacked Terror choices

Add conserved token collection with four bank spice, owner-only stack selection, recovery proofs, controls and AI. Preserve unresolved removal and expansion release gates. Verified 3712 offline cases, types, lint, production build, 40 HTTP cases, three-seat desktop/mobile play, and unchanged 3081 preexisting saved games.

components/terror-board-markers.tsx

@@ -0,0 +1,26 @@
+import { territory } from '@/game/board';
+
+/** The map shows public stack counts without reading any hidden token face. */
+export function TerrorBoardMarkers({ tokens }: {
+  tokens: readonly { status: string; location: string | null }[];
+}) {
+  const groups = new Map<string, number>();
+  for (const token of tokens)
+    if (token.status === 'placed' && token.location)
+      groups.set(token.location, (groups.get(token.location) ?? 0) + 1);
+  return [...groups].map(([id, count]) => {
+    const place = territory(id);
+    const label = `${count} hidden Terror token${count === 1 ? '' : 's'} in ${place.name}`;
+    return (
+      <g key={id} transform={`translate(${place.center[0] + 42},${place.center[1] - 22})`}
+        pointerEvents="none" aria-label={label}>
+        <title>{label}</title>
+        {count > 1 && <circle cx="3" cy="-3" r="15" fill="#392b41" stroke="#d6b9dc" strokeWidth="2" />}
+        <circle r="15" fill="#392b41" stroke="#d6b9dc" strokeWidth="2" />
+        <text y="5" textAnchor="middle" fill="#f4e1f1" fontSize="15" fontWeight="700">
+          {count === 1 ? 'T' : `T${count}`}
+        </text>
+      </g>
+    );
+  });
+}