refactor: wire controller v2 into web runtime

gunicorn.conf.py

@@ -0,0 +1,25 @@
+"""Single-process runtime: ControllerService owns one local coordinator."""
+
+from __future__ import annotations
+
+import os
+
+
+bind = f"0.0.0.0:{int(os.environ.get('PORT', '7531'))}"
+workers = 1
+worker_class = "gthread"
+threads = 4
+preload_app = False
+accesslog = "-"
+errorlog = "-"
+capture_output = True
+timeout = 30
+graceful_timeout = 15
+
+
+def worker_exit(server, worker):  # pragma: no cover - exercised by Gunicorn
+    try:
+        from wsgi import service
+    except Exception:
+        return
+    service.stop()