chore(dev): add async/thread boundary detector (#2936)

* chore(dev): add thread boundary detector

* chore(dev): reduce thread boundary detector false positives

scripts/detect_thread_boundaries.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+"""CLI wrapper for the async/thread boundary detector."""
+
+from __future__ import annotations
+
+import sys
+from collections.abc import Sequence
+from pathlib import Path
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+TEST_SUPPORT_PATH = REPO_ROOT / "backend" / "tests"
+if str(TEST_SUPPORT_PATH) not in sys.path:
+    sys.path.insert(0, str(TEST_SUPPORT_PATH))
+
+
+def main(argv: Sequence[str] | None = None) -> int:
+    from support.detectors.thread_boundaries import main as detector_main
+
+    return detector_main(argv)
+
+
+if __name__ == "__main__":
+    sys.exit(main())