tests: pin ink engine in _make_tui_argv npm-bootstrap tests (post-merge semantic fix)

Main's rewritten test_tui_npm_install.py tests call _make_tui_argv expecting
the Ink/npm flow unconditionally; with the dual-engine dispatch merged in,
_resolve_tui_engine() auto-selects opentui whenever ui-opentui/dist is built
in the repo, routing the call away from the path under test (first subprocess
became 'node --version' instead of 'npm run build'). Pin the engine to ink
via an autouse fixture, mirroring the existing pinning precedent in
test_tui_resume_flow.py.

tests/test_web_server.py

@@ -0,0 +1,16 @@
+import uvicorn
+
+from hermes_cli import web_server
+
+
+def test_start_server_enables_ws_ping_for_half_open_detection(monkeypatch):
+    """WS ping must be configured so half-open connections (reverse-proxy 524,
+    dropped tunnels) raise WebSocketDisconnect into the reaping path (#32377)."""
+    captured = {}
+    monkeypatch.setattr(uvicorn, "run", lambda *args, **kwargs: captured.update(kwargs))
+
+    # Loopback bind => no auth gate, so this reaches uvicorn.run without setup.
+    web_server.start_server(host="127.0.0.1", port=0, open_browser=False)
+
+    assert captured["ws_ping_interval"] == 20.0
+    assert captured["ws_ping_timeout"] == 20.0