Color fleet monitor rows: green operational, yellow degraded, red down

Paused or unhealthy replicas mark the service degraded even if the
tree-node floor is still met. Unmanaged NATS with no process is down.

packages/verae-fleet/test/classify.test.js

@@ -0,0 +1,36 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { classifyService } from '../src/classify.js';
+
+describe('classifyService', () => {
+  it('operational when available meets min and none paused', () => {
+    assert.equal(
+      classifyService({ min: 3, available: 3, running: 3, paused: 0, instances: [{ pid: 1, healthy: true }] }),
+      'operational',
+    );
+  });
+
+  it('degraded when a replica is paused even if floor is still met', () => {
+    assert.equal(
+      classifyService({
+        min: 3,
+        available: 3,
+        running: 4,
+        paused: 1,
+        instances: [
+          { pid: 1, paused: true, healthy: false },
+          { pid: 2, paused: false, healthy: true },
+        ],
+      }),
+      'degraded',
+    );
+  });
+
+  it('not operational when min>0 and nothing available', () => {
+    assert.equal(classifyService({ min: 1, available: 0, running: 0, paused: 0, instances: [] }), 'down');
+  });
+
+  it('optional idle (min 0, not running) is operational', () => {
+    assert.equal(classifyService({ min: 0, available: 0, running: 0, paused: 0 }), 'operational');
+  });
+});