Add Codex CLI support; xAI response improvements

cli/test/test_cli_agent.py

@@ -0,0 +1,42 @@
+from unittest import mock
+
+from planoai.core import start_cli_agent
+
+
+PLANO_CONFIG = """
+version: v0.3.0
+listeners:
+  egress_traffic:
+    host: 127.0.0.1
+    port: 12000
+"""
+
+
+def test_start_cli_agent_codex_defaults():
+    with mock.patch("builtins.open", mock.mock_open(read_data=PLANO_CONFIG)):
+        with mock.patch("subprocess.run") as mock_run:
+            start_cli_agent("fake_plano_config.yaml", "codex", "{}")
+
+    mock_run.assert_called_once()
+    args, kwargs = mock_run.call_args
+    assert args[0] == ["codex", "--model", "gpt-5.3-codex"]
+    assert kwargs["check"] is True
+    assert kwargs["env"]["OPENAI_BASE_URL"] == "http://127.0.0.1:12000/v1"
+    assert kwargs["env"]["OPENAI_API_KEY"] == "test"
+
+
+def test_start_cli_agent_claude_keeps_existing_flow():
+    with mock.patch("builtins.open", mock.mock_open(read_data=PLANO_CONFIG)):
+        with mock.patch("subprocess.run") as mock_run:
+            start_cli_agent(
+                "fake_plano_config.yaml",
+                "claude",
+                '{"NON_INTERACTIVE_MODE": true}',
+            )
+
+    mock_run.assert_called_once()
+    args, kwargs = mock_run.call_args
+    assert args[0] == ["claude"]
+    assert kwargs["check"] is True
+    assert kwargs["env"]["ANTHROPIC_BASE_URL"] == "http://127.0.0.1:12000"
+    assert kwargs["env"]["ANTHROPIC_AUTH_TOKEN"] == "test"