docs(space): add disclaimer about UI disconnect on IBM path

app.py

@@ -681,6 +681,7 @@ with gr.Blocks(title="QVerify") as demo:
                     interactive=IBM_AVAILABLE,
                 )
             gr.Markdown(_ibm_status_md)
+            gr.Markdown("⚠️ **Known limitation:** On HuggingFace's free tier (CPU Basic), the live progress stream may disconnect during long IBM jobs (typically 1-3 minutes). The job **continues executing on IBM hardware** regardless. If the Result panel clears before completion, copy the Job ID shown initially and use the \"Recover a previous job\" panel below. All executions are verifiable at [IBM Quantum Workloads](https://quantum.cloud.ibm.com/workloads).")
 
         with gr.Column(scale=1):
             gr.Markdown("### Result")