feat: add Android task file evidence and finalize plugin design

artemis/agents/operator/prompts.py

@@ -64,7 +64,7 @@ def load_operator_prompts() -> dict[str, str]:
 # artemis/agents/prompt_assembly.py for the assembly rationale.
 
 _PRE_DECISION_HELPER_TOOLS = ("ask_explorer", "ask_diagnoser", "video_analyzer")
-_PRE_DECISION_ADB_TOOLS = ("run_adb_command", "manage_task")
+_PRE_DECISION_ADB_TOOLS = ("run_adb_command", "manage_task", "android_file")
 _PRE_DECISION_MEMORY_TOOLS = (
     "read_note",
     "list_notes",
@@ -203,6 +203,10 @@ def resolve_operator_prompt_tools(ctx: ArtemisContext) -> frozenset[str]:
     # video_recording_tools_enabled); the prompt must not advertise it when the
     # tool is not actually available this run.
     available = set(OPERATOR_PROMPT_TOOLSET)
+    from artemis.tools.android_files import android_file
+
+    if not android_file.is_available(ctx):
+        available.discard("android_file")
     setup = getattr(ctx, "execution_setup", None)
     if not (setup and getattr(setup, "video_recording_tools_enabled", False)):
         available.discard("video_analyzer")