Add onion contingency miner tree with orchestrator and Seer telemetry.

Single-host branch runner complements fallback chain under Fleet AI Control: persona ghost forks, onion_miner_log hops, server exhaustion splice from graft mining genome, Crucible depth badge, and hospice retire after max cycles.

server/web/src/pages/CruciblePage.tsx

@@ -269,6 +269,13 @@ function dnsBadge(agent: Agent): { label: string; cls: string } | null {
   return null;
 }
 
+/** Contingency onion depth — Fleet AI Control single-host branch tree. */
+export function contingencyDepthBadge(agent: Agent): { label: string; cls: string } | null {
+  const depth = agent.contingency_depth ?? 0;
+  if (depth <= 0) return null;
+  return { label: `ONION ${depth}`, cls: depth >= 8 ? 'cn-contingency-deep' : 'cn-contingency' };
+}
+
 // ── Service helpers (T1007) ────────────────────────────────────────────────
 
 // Human-readable label for well-known service names
@@ -1195,6 +1202,11 @@ export default function CruciblePage() {
                     </div>
                     <div className="cn-badges">
                       <LotlTierBadge tier={a.lotl_tier} attempts={a.lotl_attempts} />
+                      {(() => { const cb = contingencyDepthBadge(a); return cb && (
+                        <div className={`cn-contingency ${cb.cls}`} title="Onion contingency tree depth (Fleet AI Control)">
+                          {cb.label}
+                        </div>
+                      ); })()}
                       <RiskBadge findings={a.vuln_findings} />
                       <div className={`cn-ssh ${ssh.cls}`}>{ssh.label}</div>
                       <div