fix: correct task scheduling and simplify agent internals

Fix queue cancellation, concurrency limits and worker status updates.

Use direct Explorer imports, split the Diagnoser loop into helpers and remove unused tool registration and prompt-builder code.

Correct model caching, endpoint selection and retry handling.

artemis/tools/command_tool.py

@@ -54,7 +54,7 @@ from artemis.controllers.platform_specific_commands_controller import (
 )
 from artemis.data_engine.trace import trace_langchain_tool
 from artemis.drivers.base import BaseDeviceDriver
-from artemis.tools.base import ArtemisTool, ToolRegistry
+from artemis.tools.base import ArtemisTool
 from artemis.tools.tool_wrapper import ToolWrapper
 from artemis.utils.logger import get_logger
 
@@ -832,7 +832,6 @@ class RunAdbCommandTool(ArtemisTool):
 # Universal tool instance & aliases
 run_adb_command = RunAdbCommandTool()
 RunAdbCommand = RunAdbCommandTool
-ToolRegistry.register(run_adb_command)
 
 
 def get_run_adb_command_tool(ctx: ArtemisContext) -> BaseTool:
@@ -978,7 +977,6 @@ class ManageTaskTool(ArtemisTool):
 # Universal tool instance & aliases
 manage_task = ManageTaskTool()
 ManageTask = ManageTaskTool
-ToolRegistry.register(manage_task)
 
 
 def get_manage_task_tool(ctx: ArtemisContext) -> BaseTool:
@@ -1111,7 +1109,6 @@ class RunShortAdbCommandTool(ArtemisTool):
 # Universal tool instance & aliases
 run_short_adb_command = RunShortAdbCommandTool()
 RunShortAdbCommand = RunShortAdbCommandTool
-ToolRegistry.register(run_short_adb_command)
 
 
 def get_run_short_adb_command_tool(ctx: ArtemisContext) -> BaseTool:
@@ -1198,7 +1195,6 @@ class AnalyzeTaskOutputTool(ArtemisTool):
 # Universal tool instance & aliases
 analyze_task_output = AnalyzeTaskOutputTool()
 AnalyzeTaskOutput = AnalyzeTaskOutputTool
-ToolRegistry.register(analyze_task_output)
 
 
 def get_analyze_task_output_tool(ctx: ArtemisContext) -> BaseTool: