feat: add gesture sequences and calibrated pixel drags

artemis/mcp/actuators/base.py

@@ -40,7 +40,8 @@ __all__ = ["Actuator"]
 class Actuator(Protocol):
     """Protocol every actuator backend implements.
 
-    All coordinates are 0-1000 normalized. Every action coroutine returns an
+    Coordinates are 0-1000 normalized, except drag/sequence members explicitly
+    marked coordinate_space="pixel". Every action coroutine returns an
     :class:`ActionResult` and must not raise for device-level failures -- those are
     reported through ``ok=False`` so a failed tap reaches the agent as an observation
     rather than an exception.
@@ -84,6 +85,10 @@ class Actuator(Protocol):
 
     async def press_key(self, key: str) -> ActionResult: ...
 
+    async def drag(self, **kwargs: Any) -> ActionResult: ...
+
+    async def action_sequence(self, steps: list[Any]) -> ActionResult: ...
+
     async def manage_app(self, action: str, app_name: str) -> ActionResult: ...
 
     async def wait_for_delay(self, time_in_ms: int) -> ActionResult: ...