Test suite leaks broker processes — 158 orphans found

Problem

Running the codex plugin test suite spawns app-server-broker.mjs processes for each test workspace (/tmp/codex-plugin-test-*), but these processes are never cleaned up after tests complete.

Found 158 stale broker processes on a development machine, each holding a /tmp/cxc-* socket directory. All were from old test runs (dated Apr 3–6), pointing at temp dirs that may or may not still exist.

Evidence

$ ps aux | grep 'app-server-broker.mjs' | grep -v grep | wc -l
167

$ ps aux | grep 'app-server-broker.mjs' | grep -v grep | grep -oP '(?<=--cwd )\S+' | sort | uniq -c | sort -rn | head -5
1 /tmp/codex-plugin-test-zxrQqX
1 /tmp/codex-plugin-test-znwec8
... (158 test dirs total)

$ ls -d /tmp/cxc-* | wc -l
168

Expected behavior

Test teardown should kill broker processes it spawned (or the broker should self-terminate when its cwd disappears / after idle timeout).

Impact

• Resource leak: 167 node processes × ~35MB RSS = ~5.8GB wasted
• Socket dir accumulation in /tmp
• May contribute to Codex review failures when the system is under resource pressure

Start by locating the test-suite teardown that launches app-server-broker.mjs for /tmp/codex-plugin-test-* workspaces. Reproduce the suite and inspect whether spawned brokers and /tmp/cxc-* socket directories are tracked. Done means test-spawned brokers no longer remain after teardown and the resource accumulation described here is prevented.