Complete subnet immune autopsy UI and prefix normalization.

Normalize /24 labels for autopsy API and cred-graph triggers; add Emberwake/Path Tracer autopsy cards and Vitest coverage for Seer feed consumers.

server/web/src/help/subnetAutopsy.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from 'vitest';
+import { parseSeerSubnetAutopsy, subnetAutopsyPrefix } from './subnetAutopsy';
+
+describe('subnetAutopsy helpers', () => {
+  it('parses seer subnet immune autopsy events', () => {
+    const ev = parseSeerSubnetAutopsy({
+      type: 'subnet_immune_autopsy',
+      prefix: '10.0.0',
+      cause: 'Subnet 10.0.0 immune pause',
+      packet: { prefix: '10.0.0', fail_count: 5, cause_of_death: 'paused' },
+    });
+    expect(ev?.prefix).toBe('10.0.0');
+    expect(ev?.cause).toContain('immune pause');
+    expect(ev?.packet?.fail_count).toBe(5);
+  });
+
+  it('rejects non-autopsy seer payloads', () => {
+    expect(parseSeerSubnetAutopsy({ type: 'court_debate' })).toBeNull();
+    expect(parseSeerSubnetAutopsy(null)).toBeNull();
+  });
+
+  it('normalizes subnet labels to /24 prefix', () => {
+    expect(subnetAutopsyPrefix('10.0.0.x')).toBe('10.0.0');
+    expect(subnetAutopsyPrefix('10.0.0/24')).toBe('10.0.0');
+    expect(subnetAutopsyPrefix('192.168.5.12')).toBe('192.168.5');
+  });
+});