feat: add Android task file evidence and finalize plugin design

artemis/mcp/action_executor.py

@@ -51,6 +51,7 @@ from artemis.agents.validator.tool_declarations import (
     normalize_coordinate_target,
 )
 from artemis.tools.history import HISTORY_TOOL_NAMES, history_tool_by_name
+from artemis.tools.android_files import android_file
 from artemis.tools.tool_wrapper import split_multimodal_result
 from artemis.utils.coordinates import (
     compute_smart_swipe_coordinates,
@@ -73,7 +74,8 @@ __all__ = ["McpActionExecutor"]
 
 #: Non-device tools executed agent-side (never behind the action server).
 AGENT_TOOL_NAMES: frozenset[str] = (
-    frozenset({"read_note", "list_notes", "ask_explorer", "video_analyzer"}) | HISTORY_TOOL_NAMES
+    frozenset({"read_note", "list_notes", "ask_explorer", "video_analyzer", "android_file"})
+    | HISTORY_TOOL_NAMES
 )
 
 #: Actions whose ``target`` is a single point: an element index or an [x, y] pair.
@@ -769,6 +771,8 @@ class McpActionExecutor:
                 )
             elif raw_name in HISTORY_TOOL_NAMES:
                 text, blocks = await self._history_tool(raw_name, args)
+            elif raw_name == "android_file":
+                text = await android_file.execute(ctx=self.ctx, **args)
             else:
                 text, ok = await self._ask_explorer(
                     # ``task_description`` is the pre-contract argument name