Add Space runtime smoke check

README.md

@@ -157,6 +157,8 @@ Then open `http://127.0.0.1:7860`.
 Before pushing Space changes, run at least:
 
 ```bash
+python3 check_space_runtime.py
+
 python3 -B - <<'PY'
 from pathlib import Path
 import py_compile

check_space_runtime.py

@@ -0,0 +1,55 @@
+from __future__ import annotations
+
+import asyncio
+import tempfile
+from pathlib import Path
+
+from frontend import local_server
+
+
+def main() -> int:
+    with tempfile.TemporaryDirectory(prefix="rh_space_check_") as tmp:
+        runs_dir = Path(tmp) / "runs"
+        local_server.configure_frontend(
+            managed_runs_dir=str(runs_dir),
+            cleanup_retention_seconds=60,
+            cleanup_max_runs=2,
+            cleanup_interval_seconds=60,
+            collection_enabled=True,
+            collection_dataset_repo="CoCoOne/ResearchHarness-Data",
+            collection_batch_size=5,
+            collection_max_bundle_bytes=1024 * 1024,
+        )
+
+        collection_root = local_server._collection_root()
+        if collection_root is None or not collection_root.exists():
+            raise RuntimeError("collection root was not created")
+
+        token = local_server._collection_token()
+        if token is not None and not isinstance(token, str):
+            raise RuntimeError("collection token helper returned a non-string value")
+
+        loop = asyncio.new_event_loop()
+        try:
+            bridge = local_server.FrontendRunBridge(loop=loop)
+            workspace_root, trace_dir = local_server._create_managed_run(bridge)
+            run_root = Path(bridge.managed_run_root)
+            (workspace_root / "answer.txt").write_text("ok\n", encoding="utf-8")
+            Path(trace_dir, "trace.jsonl").write_text('{"ok": true}\n', encoding="utf-8")
+            bundle = local_server._write_collection_bundle(
+                run_root,
+                {"result_text": "ok", "termination": "result"},
+            )
+            if bundle is None or not bundle.exists():
+                raise RuntimeError("collection bundle was not created")
+            local_server._release_managed_run(bridge)
+            local_server.cleanup_managed_runs_once()
+        finally:
+            loop.close()
+
+    print("space runtime ok")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

frontend/local_server.py

@@ -4,6 +4,7 @@ import asyncio
 import base64
 import datetime as _dt
 import json
+import os
 import re
 import shutil
 import threading