feat: make each plugin an npm workspace built by a termix-plugin CLI

plugins/host-metrics/tests/frontend/metrics-change-key.test.ts

@@ -0,0 +1,69 @@
+import { describe, expect, it } from "vitest";
+import type { ServerMetrics } from "@/main-axios";
+import type { GpuMetrics } from "@/types/stats-widgets";
+import { metricsChangeKey } from "../../src/frontend/metrics-change-key";
+
+function poll(gpu: GpuMetrics): ServerMetrics {
+  return {
+    cpu: { percent: 3, cores: 8, load: [0.1, 0.1, 0.1] },
+    memory: { percent: 40, usedGiB: 12, totalGiB: 32 },
+    disk: { percent: 55 },
+    gpu,
+    lastChecked: "2026-09-18T00:00:00.000Z",
+  } as ServerMetrics;
+}
+
+function gpuAt(utilizationPercent: number, memoryPercent: number): GpuMetrics {
+  return {
+    source: "nvidia-smi",
+    gpus: [
+      {
+        index: 0,
+        uuid: "GPU-0",
+        name: "NVIDIA GeForce RTX 4090",
+        driverVersion: "550.54.14",
+        utilizationPercent,
+        memoryUsedMiB: 1000,
+        memoryTotalMiB: 24564,
+        memoryPercent,
+        temperatureCelsius: 50,
+        powerDrawWatts: 30,
+        powerLimitWatts: 450,
+        fanPercent: 30,
+      },
+    ],
+    processes: [],
+  };
+}
+
+describe("metricsChangeKey", () => {
+  it("changes when only GPU utilization moves", () => {
+    expect(metricsChangeKey(poll(gpuAt(0, 4)))).not.toBe(
+      metricsChangeKey(poll(gpuAt(95, 4))),
+    );
+  });
+
+  it("changes when only GPU memory moves", () => {
+    expect(metricsChangeKey(poll(gpuAt(0, 4)))).not.toBe(
+      metricsChangeKey(poll(gpuAt(0, 80))),
+    );
+  });
+
+  it("changes when a GPU process starts", () => {
+    const idle = gpuAt(0, 4);
+    const busy: GpuMetrics = {
+      ...idle,
+      processes: [
+        { gpuIndex: 0, pid: 4242, name: "python3", memoryUsedMiB: 900 },
+      ],
+    };
+
+    expect(metricsChangeKey(poll(idle))).not.toBe(metricsChangeKey(poll(busy)));
+  });
+
+  it("ignores GPU jitter inside the same 5% bucket", () => {
+    expect(metricsChangeKey(poll(gpuAt(41, 20)))).toBe(
+      metricsChangeKey(poll(gpuAt(42, 21))),
+    );
+  });
+});