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.

tests/integration/agents/explorer/test_explorer_all_tools/test_explorer_all_tools.py

@@ -87,7 +87,7 @@ async def test_explorer_all_tools_sequential_mocked():
     logger.addHandler(handler)
 
     # Attach the main agent logger to capture internal step logs
-    agent_logger = logging.getLogger("artemis.agents.explorer.explorer")
+    agent_logger = logging.getLogger("artemis.agents.explorer")
     agent_logger.setLevel(logging.INFO)
     agent_logger.addHandler(handler)
 
@@ -238,12 +238,13 @@ async def test_explorer_all_tools_sequential_mocked():
             return_value=mock_client,
         ),
         patch(
-            "artemis.agents.explorer.explorer.StorageManager",
+            "artemis.agents.explorer.run_setup.StorageManager",
             return_value=mock_storage,
         ),
         # get_ocr_list is only exposed when an OCR backend is configured.
         patch("artemis.agents.explorer.explorer.is_ocr_configured", return_value=True),
-        patch("artemis.agents.explorer.explorer._run_object_detection", mock_detect),
+        patch("artemis.agents.explorer.run_setup.is_ocr_configured", return_value=True),
+        patch("artemis.agents.explorer.perception_tools._run_object_detection", mock_detect),
     ):
         explorer = Explorer(mock_ctx)
         result = await explorer.run(

tests/integration/agents/explorer/test_explorer_all_tools/test_explorer_ask_image_processor.py

@@ -84,7 +84,7 @@ async def test_explorer_ask_image_processor_tool():
     logger.addHandler(handler)
 
     # Attach the main agent logger to capture internal step logs
-    agent_logger = logging.getLogger("artemis.agents.explorer.explorer")
+    agent_logger = logging.getLogger("artemis.agents.explorer")
     agent_logger.setLevel(logging.INFO)
     agent_logger.addHandler(handler)