fix(stats): harden server lifecycle and verify compiled runtime (#261)

scripts/compiled-runtime-smoke.test.ts

@@ -0,0 +1,28 @@
+import assert from 'node:assert/strict';
+import { spawnSync } from 'node:child_process';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+
+test('compiled runtime smoke fails clearly when build artifacts are missing', () => {
+  const emptyRepo = fs.mkdtempSync(path.join(os.tmpdir(), 'subminer-compiled-missing-'));
+  try {
+    const result = spawnSync(
+      process.execPath,
+      ['scripts/compiled-runtime-smoke.mjs', '--repo-root', emptyRepo],
+      {
+        cwd: path.resolve(import.meta.dir, '..'),
+        encoding: 'utf8',
+      },
+    );
+
+    assert.equal(result.status, 1);
+    assert.match(result.stderr, /Compiled runtime artifacts are missing/);
+    assert.match(result.stderr, /dist\/main-entry\.js/);
+    assert.match(result.stderr, /dist\/stats-daemon-runner\.js/);
+    assert.doesNotMatch(result.stderr, /must run with Electron/);
+  } finally {
+    fs.rmSync(emptyRepo, { recursive: true, force: true });
+  }
+});