feat(mcp): queue long-running calculations

scripts/run_calculation_worker.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+"""Run the independent calculation supervisor (never an API lifespan task)."""
+import argparse
+import asyncio
+from pathlib import Path
+import signal
+import sys
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+
+from dotenv import load_dotenv
+
+from app.services.calculation_worker import CalculationWorker, WorkerSettings
+
+
+async def main():
+    load_dotenv(Path(__file__).resolve().parents[1] / '.env', override=False)
+    task = asyncio.create_task(CalculationWorker(WorkerSettings.from_environment()).run())
+    loop = asyncio.get_running_loop()
+    for signum in (signal.SIGTERM, signal.SIGINT):
+        loop.add_signal_handler(signum, task.cancel)
+    try:
+        await task
+    except asyncio.CancelledError:
+        pass
+
+
+if __name__ == '__main__':
+    argparse.ArgumentParser(description=__doc__).parse_args()
+    asyncio.run(main())