Add drone ops mode and retire DMR support

utils/drone/policy.py

@@ -0,0 +1,11 @@
+"""Drone Ops policy helpers."""
+
+from __future__ import annotations
+
+
+def required_approvals_for_action(action_type: str) -> int:
+    """Return required approvals for a given action type."""
+    action = (action_type or '').strip().lower()
+    if action.startswith('passive_'):
+        return 1
+    return 2