test: add GPU and quota service tests

test/gpu.test.js

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+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { parseNvidiaSmiCsv } from '../src/services/gpu.js';
+
+describe('parseNvidiaSmiCsv', () => {
+  it('parses GPU memory and utilization rows', () => {
+    const result = parseNvidiaSmiCsv('0, NVIDIA A100, 1024, 40960, 87\n1, RTX 4090, 12, 24564, 3');
+
+    assert.deepEqual(result, [
+      {
+        index: 0,
+        name: 'NVIDIA A100',
+        memoryUsedMiB: 1024,
+        memoryTotalMiB: 40960,
+        gpuUtilizationPercent: 87
+      },
+      {
+        index: 1,
+        name: 'RTX 4090',
+        memoryUsedMiB: 12,
+        memoryTotalMiB: 24564,
+        gpuUtilizationPercent: 3
+      }
+    ]);
+  });
+});

test/quota.test.js

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+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { summarizeQuotaOutput } from '../src/services/quota.js';
+
+describe('summarizeQuotaOutput', () => {
+  it('summarizes ipads-quota json output', () => {
+    const result = summarizeQuotaOutput('{"remaining":123,"usage":{"total":45}}');
+
+    assert.equal(result.kind, 'json');
+    assert.equal(result.remaining, 123);
+    assert.equal(result.used, 45);
+  });
+
+  it('summarizes text output from custom quota commands', () => {
+    const result = summarizeQuotaOutput('remaining: 80 used: 20 limit: 100');
+
+    assert.equal(result.kind, 'text');
+    assert.equal(result.remaining, 80);
+    assert.equal(result.used, 20);
+    assert.equal(result.limit, 100);
+  });
+});