WIP autoscaler agent

agent/nix_builder_autoscaler/runtime/ec2.py

@@ -0,0 +1,32 @@
+"""EC2 runtime adapter — stub for Plan 02."""
+
+from __future__ import annotations
+
+from .base import RuntimeAdapter
+
+
+class EC2Runtime(RuntimeAdapter):
+    """EC2 Spot instance runtime adapter.
+
+    Full implementation in Plan 02.
+    """
+
+    def __init__(self, region: str, launch_template_id: str, **kwargs: object) -> None:
+        self._region = region
+        self._launch_template_id = launch_template_id
+
+    def launch_spot(self, slot_id: str, user_data: str) -> str:
+        """Launch a spot instance for slot_id."""
+        raise NotImplementedError
+
+    def describe_instance(self, instance_id: str) -> dict:
+        """Return normalized instance info."""
+        raise NotImplementedError
+
+    def terminate_instance(self, instance_id: str) -> None:
+        """Terminate the instance."""
+        raise NotImplementedError
+
+    def list_managed_instances(self) -> list[dict]:
+        """Return list of managed instances."""
+        raise NotImplementedError