Release validation: tests green, USB pack, fleet UX and API hardening.

Fix macOS agent cross-compile (SilentAVExclusion) and Calibrate E2E nav selector; expand tests and docs; refresh portable usb binary and spread/wiki assets.

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

@@ -0,0 +1,36 @@
+import { describe, expect, it } from 'vitest';
+import { agentStatsUnchanged } from './wsStatsCoalesce';
+import { mockAgent } from '../test/fixtures';
+
+describe('agentStatsUnchanged', () => {
+  it('returns true when payload matches current agent stats', () => {
+    const agent = mockAgent({
+      hashrate_15s: 100,
+      hashrate_1m: 90,
+      hashrate_15m: 80,
+      cpu_usage_pct: 12,
+    });
+    expect(
+      agentStatsUnchanged(agent, {
+        agent_id: agent.id,
+        hashrate_15s: 100,
+        hashrate_1m: 90,
+        hashrate_15m: 80,
+        cpu_usage_pct: 12,
+      }),
+    ).toBe(true);
+  });
+
+  it('returns false when hashrate changes', () => {
+    const agent = mockAgent({ hashrate_15s: 100, hashrate_1m: 90, hashrate_15m: 80, cpu_usage_pct: 12 });
+    expect(
+      agentStatsUnchanged(agent, {
+        agent_id: agent.id,
+        hashrate_15s: 101,
+        hashrate_1m: 90,
+        hashrate_15m: 80,
+        cpu_usage_pct: 12,
+      }),
+    ).toBe(false);
+  });
+});