fix: restore interactive PTY behavior

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a03397-4d51-7fd1-8ff2-946eb22ea2bc

tests/test_tmux_manager.py

@@ -93,6 +93,31 @@ def test_preflight_rejects_foreign_session(tmp_path, monkeypatch):
         manager.preflight(["a"])
 
 
+def test_tmux_only_plan_starts_agent_without_tap(tmp_path, monkeypatch):
+    manager = tmux.TmuxManager("tamq-test")
+    calls = []
+    plan = tmux.LaunchPlan(("a",), {"a": str(tmp_path)}, ("codex", "--quiet"))
+
+    def run(*args, check=True):
+        calls.append(args)
+        if args[:2] == ("display-message", "-p"):
+            return "42"
+        if args[:2] == ("list-windows", "-t"):
+            return "__tamq_boot"
+        return ""
+
+    monkeypatch.setattr(manager, "_run", run)
+    monkeypatch.setattr(
+        tmux.subprocess,
+        "run",
+        lambda *args, **kwargs: type("R", (), {"returncode": 1})(),
+    )
+    manager.ensure_plan(plan, tap=False)
+    send = next(call for call in calls if call and call[0] == "send-keys")
+    assert "codex --quiet" in send
+    assert "tamq tap" not in send
+
+
 def test_preflight_rejects_missing_agent(tmp_path, monkeypatch):
     repo = tmp_path / "a"
     repo.mkdir()