feat: add safe miner control foundation

backend/app/miner_control/exceptions.py

@@ -0,0 +1,21 @@
+"""Miner control domain exceptions."""
+
+
+class MinerControlError(Exception):
+    """Base miner control error."""
+
+
+class ControlledMinerNotFound(MinerControlError):
+    """The durable miner UUID is unknown."""
+
+
+class MinerControlUnavailable(MinerControlError):
+    """The requested action cannot be safely queued."""
+
+
+class MinerControlConflict(MinerControlError):
+    """Another live control operation already exists."""
+
+
+class MinerControlActorRequired(MinerControlError):
+    """An authenticated actor UUID is required."""