fix(cli): bound telemetry shutdown on signals

Refs #1356

apps/cli/tests/fixtures/never-dispose.mjs

@@ -0,0 +1,14 @@
+/** Test-only Cordis plugin whose disposer announces entry and never settles. */
+
+/**
+ * Register a disposer that keeps process shutdown pending until it is forced.
+ * @param {import('cordis').Context} ctx - loader-mounted test plugin context.
+ */
+export function apply(ctx) {
+  const keepAlive = setInterval(() => {}, 60_000)
+  ctx.effect(() => async () => {
+    clearInterval(keepAlive)
+    process.stderr.write('dsh-test: never-dispose started\n')
+    await new Promise(() => {})
+  })
+}