Repair MCP diagnostics and gateway lifecycle

tests/test_gateway_terminal_pty_capture.py

@@ -0,0 +1,38 @@
+import importlib.util
+import pathlib
+import types
+
+
+def load_module():
+    script_path = pathlib.Path(__file__).resolve().parents[1] / "resources" / "scripts" / "napseer_mcp_server.py"
+    spec = importlib.util.spec_from_file_location("napseer_mcp_server_pty_capture_test", script_path)
+    module = importlib.util.module_from_spec(spec)
+    assert spec and spec.loader
+    spec.loader.exec_module(module)
+    return module
+
+
+def test_capture_reads_pty_ring_instead_of_tmux():
+    mod = load_module()
+    attach = types.SimpleNamespace(
+        chunks=(
+            types.SimpleNamespace(data=b"first\n"),
+            types.SimpleNamespace(data=b"napseer-lifecycle-ok\n"),
+        ),
+        newest_seq=2,
+        replay_gap=False,
+    )
+    manager = types.SimpleNamespace(attach=lambda terminal_id: attach)
+    mod.gateway_terminal_backend_from_id = lambda terminal_id, remote_authenticated=False: (
+        "pty",
+        {"id": terminal_id},
+    )
+    mod.gateway_pty_manager = lambda: manager
+
+    result = mod.gateway_terminal_capture({"terminal_id": "term_test"})
+
+    assert result["status"] == "captured"
+    assert result["terminal_backend"] == "pty"
+    assert result["terminal_id"] == "term_test"
+    assert "napseer-lifecycle-ok" in result["output"]
+    assert result["output_seq"] == 2