Preserve agent cwd through Codex app server

tests/smoke_codex.sh

@@ -96,6 +96,12 @@ else
   fail "Codex probe did not complete (cmd=${cmd}); tail: $(echo "$pane" | grep -vE '^\s*$' | tail -5)"
 fi
 
+if echo "$pane" | grep -Fq "$REPO"; then
+  pass "daemon-created Codex thread uses the requested project directory"
+else
+  fail "Codex thread did not use requested directory $REPO"
+fi
+
 if python3 "$REPO/agents.py" --config "$CFG" status \
     | grep -E '^\s*probe\b' | grep -q RUNNING; then
   pass "agents.py status reports probe RUNNING"

tests/test_unit.py

@@ -279,8 +279,9 @@ class TestExampleConfig(unittest.TestCase):
             cmd = launched[0]
             self.assertTrue(cmd.startswith(
                 "codex remote-control start --json >/dev/null && "
-                "codex --remote 'unix://' --model 'gpt-test' "))
+                "codex --remote 'unix://' -C "))
             self.assertEqual(cmd.count("--remote 'unix://'"), 1)
+            self.assertIn(f"-C {agents.shlex.quote(cfg['agents']['cx']['dir'])}", cmd)
             self.assertIn("--model 'gpt-test'", cmd)
             self.assertIn(
                 "--dangerously-bypass-approvals-and-sandbox --dangerously-bypass-hook-trust --no-alt-screen",