feat: make sessions terminal neutral

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

tests/test_tmux_manager.py

@@ -21,7 +21,8 @@ def test_tmux_manager_builds_tap_windows(tmp_path, monkeypatch):
         return ""
     monkeypatch.setattr(manager, "_run", run)
     monkeypatch.setattr(tmux.subprocess, "run", lambda *args, **kwargs: type("R", (), {"returncode": 1})())
-    endpoint = manager.ensure(["a", "b"], "codex --quiet")
+    plan = manager.preflight(["a", "b"], "codex --quiet")
+    endpoint = manager.ensure_plan(plan, tap=True)
     assert endpoint.endpoint_id == "tmux-amq-42"
     assert endpoint.instance_id.startswith("tmux-amq-42-")
     assert endpoint.repos == ["a", "b"]
@@ -118,6 +119,34 @@ def test_tmux_only_plan_starts_agent_without_tap(tmp_path, monkeypatch):
     assert "tamq tap" not in send
 
 
+def test_neutral_plan_starts_shell_without_sending_keystrokes(tmp_path, monkeypatch):
+    manager = tmux.TmuxManager("tamq-test")
+    calls = []
+    plan = tmux.LaunchPlan(("a", "b"), {"a": str(tmp_path), "b": str(tmp_path)}, ())
+
+    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)
+
+    assert not any(call and call[0] == "send-keys" for call in calls)
+    new_session = next(call for call in calls if call and call[0] == "new-session")
+    new_window = next(call for call in calls if call and call[0] == "new-window")
+    assert "TAMQ_REPO=a" in new_session
+    assert "TAMQ_REPO=b" in new_window
+
+
 def test_preflight_rejects_missing_agent(tmp_path, monkeypatch):
     repo = tmp_path / "a"
     repo.mkdir()
@@ -125,7 +154,7 @@ def test_preflight_rejects_missing_agent(tmp_path, monkeypatch):
     monkeypatch.setattr(tmux, "validate_targets", lambda repos: None)
     monkeypatch.setattr(tmux, "repository_paths", lambda: {"a": str(repo)})
     monkeypatch.setattr(tmux.shutil, "which", lambda command: None if command == "missing-agent" else f"/bin/{command}")
-    with pytest.raises(tmux.TmuxError, match="agent command not found"):
+    with pytest.raises(tmux.TmuxError, match="initial command not found"):
         manager.preflight(["a"], "missing-agent")