test(cli): keep the packed rehearsal's primary failure visible

The teardown asserted the Web process's SIGTERM exit inside `finally`, so a
body failure was reported as a shutdown timeout instead of itself. The
assertions now run only when the body passed, the earlier failure is rethrown
after teardown, and the listener readiness became a named step that no longer
clones the release pack coordinator's listen idiom.

apps/cli/tests/profiles/official-installer-packed.e2e.ts

@@ -119,6 +119,9 @@ it.skipIf(!built)('installs the exported registry\'s local closure and switches
   })
   if (child.stdout === null) throw new Error('installed Web process has no stdout')
   const lines = createInterface({ input: child.stdout })
+  // A failure in the body must stay the reported one: teardown asserts only when the body
+  // passed, so a Web process that does not exit cannot replace the real error.
+  let failure: unknown
   try {
     const observed = await new Promise<Observation>((resolveObservation, reject) => {
       lines.on('line', (line) => {
@@ -161,11 +164,17 @@ it.skipIf(!built)('installs the exported registry\'s local closure and switches
     expect(record.buildId).toBe('packed-e2e')
     expect(record.packages).toHaveLength(selection.members.length)
     expect(record.packages).toEqual(expect.arrayContaining([expect.objectContaining({ name: packages[0], version })]))
+  } catch (error) {
+    failure = error
   } finally {
     lines.close()
     child.kill('SIGTERM')
     const result = await child
-    expect(result.timedOut, `${result.stdout}\n${result.stderr}`).toBe(false)
-    expect(result.exitCode === 0 || result.signal === 'SIGTERM', result.stderr).toBe(true)
+    if (failure === undefined) {
+      // The installed Web process stops on SIGTERM within its own budget; a timed-out child is a teardown defect.
+      expect(result.timedOut, `${result.stdout}\n${result.stderr}`).toBe(false)
+      expect(result.exitCode === 0 || result.signal === 'SIGTERM', result.stderr).toBe(true)
+    }
   }
+  if (failure !== undefined) throw failure
 })

scripts/local-bundle-registry.ts

@@ -563,13 +563,15 @@ export async function startBundleRegistry(options: {
     response.end()
   })
 
-  await new Promise<void>((resolveListen, rejectListen) => {
+  const listening = new Promise<void>((resolveListen, rejectListen) => {
     server.once('error', rejectListen)
-    server.listen(0, '127.0.0.1', () => {
+    server.once('listening', () => {
       server.off('error', rejectListen)
       resolveListen()
     })
   })
+  server.listen({ port: 0, host: '127.0.0.1' })
+  await listening
   const address = server.address()
   if (address === null || typeof address === 'string') {
     await closeServer(server)