fix(cli): bound telemetry shutdown on signals

Refs #1356

apps/cli/tests/headless-shutdown.e2e.ts

@@ -0,0 +1,43 @@
+import { mkdir, writeFile } from 'node:fs/promises'
+import { join } from 'node:path'
+import { fileURLToPath, pathToFileURL } from 'node:url'
+import { describe, expect, it } from 'vitest'
+import { LOADER_SMOKE_TEST_TIMEOUT_MS } from '@deepseek-ai/dsh-loader-smoke'
+import { runTuiPtySmoke } from './pty-harness.ts'
+
+const dshBinScript = fileURLToPath(new URL('../src/bin.ts', import.meta.url))
+const tsconfigPath = fileURLToPath(new URL('../../../tsconfig.json', import.meta.url))
+const neverDisposePlugin = pathToFileURL(
+  fileURLToPath(new URL('./fixtures/never-dispose.mjs', import.meta.url)),
+).href
+
+describe.skipIf(process.platform === 'win32')('headless process shutdown (real Loader tree in a PTY)', () => {
+  it('lets a second Ctrl+C force exit while the first signal is draining', async () => {
+    const output = await runTuiPtySmoke({
+      label: 'dsh headless repeated Ctrl+C',
+      tempDirPrefix: 'dsh-headless-shutdown-',
+      binScript: dshBinScript,
+      tsconfigPath,
+      configArgs: ['-p', 'never complete'],
+      env: { DEEPSEEK_API_KEY: 'keyless-shutdown-no-call', DSH_TELEMETRY_DISABLED: '1' },
+      expectedExitCode: 130,
+      timeoutMs: 15_000,
+      prepare: async (cwd) => {
+        const home = join(cwd, '.dsh')
+        await mkdir(home, { recursive: true })
+        await writeFile(join(home, 'config.yaml'), [
+          '- insert:',
+          '    - id: never-dispose',
+          `      name: '${neverDisposePlugin}'`,
+          '',
+        ].join('\n'))
+      },
+      actions: [
+        { waitFor: 'dsh: observing at ', send: '\u0003' },
+        { waitFor: 'dsh-test: never-dispose started', send: '\u0003' },
+      ],
+    })
+    expect(output).toContain('dsh: observing at ')
+    expect(output).toContain('dsh-test: never-dispose started')
+  }, LOADER_SMOKE_TEST_TIMEOUT_MS)
+})