Fix Codex Remote thread writer conflicts

tests/smoke_codex.sh

@@ -1,7 +1,8 @@
 #!/usr/bin/env bash
 # Isolated live smoke of the Codex backend, driven entirely through agents.py.
-# It starts one uniquely-named tmux session, verifies Remote Control and the Codex TUI, then
-# removes only that session. The shared Remote Control daemon intentionally remains available.
+# It starts one uniquely-named tmux session, verifies Remote Control and a daemon-connected Codex
+# TUI, then removes only that session. The shared Remote Control daemon intentionally remains
+# available.
 set -uo pipefail
 
 HERE="$(cd "$(dirname "$0")" && pwd)"
@@ -54,6 +55,7 @@ watch          = "none"
 [backend.codex]
 bin             = "$CODEX_BIN"
 preamble        = "{bin} remote-control start --json >/dev/null"
+remote_addr     = "unix://"
 flags           = "--dangerously-bypass-approvals-and-sandbox --dangerously-bypass-hook-trust --no-alt-screen"
 supports_resume = false
 prompt_delivery = "arg"

tests/test_unit.py

@@ -77,6 +77,7 @@ limit_re  = "usage limit|limit reached"
 [backend.codex]
 bin             = "codex"
 preamble        = "{bin} remote-control start --json >/dev/null"
+remote_addr     = "unix://"
 flags           = "--dangerously-bypass-approvals-and-sandbox --dangerously-bypass-hook-trust --no-alt-screen"
 supports_resume = false
 prompt_delivery = "arg"
@@ -260,7 +261,7 @@ class TestExampleConfig(unittest.TestCase):
             self.assertIn(be, cfg["backends"], f"backend {be} missing from example")
         self.assertEqual(len(agents.phases(cfg)), 2)
 
-    def test_codex_launch_prepares_remote_control_then_starts_tui(self):
+    def test_codex_launch_prepares_remote_control_then_connects_tui_to_daemon(self):
         tmp = tempfile.mkdtemp(prefix="aotest-ut-codex-")
         old_alive, old_new, old_log = agents.session_alive, agents.new_session, agents.log
         old_capture, old_run = agents.capture_pane, agents._run
@@ -277,7 +278,9 @@ class TestExampleConfig(unittest.TestCase):
             self.assertEqual(len(launched), 1)
             cmd = launched[0]
             self.assertTrue(cmd.startswith(
-                "codex remote-control start --json >/dev/null && codex "))
+                "codex remote-control start --json >/dev/null && "
+                "codex --remote 'unix://' --model 'gpt-test' "))
+            self.assertEqual(cmd.count("--remote 'unix://'"), 1)
             self.assertIn("--model 'gpt-test'", cmd)
             self.assertIn(
                 "--dangerously-bypass-approvals-and-sandbox --dangerously-bypass-hook-trust --no-alt-screen",