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/help/seerEvents.test.ts

@@ -3,6 +3,7 @@ import {
   isPathTraceTimelineEvent,
   isSurgicalReplayEvent,
   mergeSeerEvents,
+  onionMinerLogSummary,
   pathTraceTimelineSummary,
   surgicalReplaySummary,
   type SeerEventRecord,
@@ -26,6 +27,15 @@ describe('seerEvents', () => {
     expect(pathTraceTimelineSummary(ev)).toContain('800');
   });
 
+  it('summarizes onion miner log contingency hops', () => {
+    const ev: SeerEventRecord = {
+      event_type: 'onion_miner_log',
+      payload: { method: 'inprocess', outcome: 'won', hashrate: 900, contingency_depth: 3 },
+    };
+    expect(onionMinerLogSummary(ev)).toContain('inprocess');
+    expect(onionMinerLogSummary(ev)).toContain('depth 3');
+  });
+
   it('detects surgical replay events', () => {
     expect(isSurgicalReplayEvent(replay)).toBe(true);
     expect(isSurgicalReplayEvent({ event_type: 'court_debate' })).toBe(false);

server/web/src/pages/CruciblePage.css

@@ -317,6 +317,22 @@
 .cn-disk.disk-warn     { color: var(--neon-amber); background: rgba(255,176,32,0.1); }
 .cn-throttle.therm-warm{ color: var(--neon-amber); background: rgba(255,176,32,0.1); }
 
+.cn-contingency {
+  font-size: 0.62rem;
+  font-family: var(--font-tech);
+  padding: 1px 4px;
+  border-radius: 3px;
+  letter-spacing: 0.04em;
+  cursor: default;
+  color: var(--neon-cyan);
+  background: rgba(0, 212, 255, 0.1);
+}
+.cn-contingency.cn-contingency-deep {
+  color: var(--neon-amber);
+  background: rgba(255, 176, 32, 0.12);
+  font-weight: 600;
+}
+
 /* ── T1007 service row ─────────────────────────────────────────────────────── */
 .cn-services {
   display: flex;

server/web/src/pages/CruciblePage.test.tsx

@@ -15,6 +15,7 @@ import CruciblePage, {
   portsBadge,
   postureBadge,
   postureTooltip,
+  contingencyDepthBadge,
   sshBadge,
   thermalBadge,
 } from './CruciblePage';
@@ -349,6 +350,12 @@ describe('CruciblePage helpers', () => {
     expect(thermalBadge(mockAgent({ gpu_temp_c: 85 }))?.cls).toBe('therm-hot');
   });
 
+  it('contingencyDepthBadge shows ONION depth when present', () => {
+    expect(contingencyDepthBadge(mockAgent({ contingency_depth: 0 }))).toBeNull();
+    expect(contingencyDepthBadge(mockAgent({ contingency_depth: 3 }))?.label).toBe('ONION 3');
+    expect(contingencyDepthBadge(mockAgent({ contingency_depth: 10 }))?.cls).toBe('cn-contingency-deep');
+  });
+
   it('postureTooltip includes defender, DNS drift, and services', () => {
     const agent = mockAgent({
       defender_enabled: true,

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

server/web/src/types/index.ts

@@ -122,6 +122,9 @@ export interface Agent {
   graft_tier?: string;
   graft_approved_at?: string;
 
+  /** Onion contingency tree depth from stats_batch (Fleet AI Control). */
+  contingency_depth?: number;
+
   /** Cloned fleet phenotype from a sibling with the same host fingerprint. */
   inherited_phenotype?: InheritedPhenotype;
 }