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/unit/agents/test_explorer.py

@@ -106,7 +106,7 @@ async def test_explorer_run():
             return_value=mock_client,
         ),
         patch(
-            "artemis.agents.explorer.explorer.StorageManager",
+            "artemis.agents.explorer.run_setup.StorageManager",
             return_value=mock_storage,
         ),
         patch("pathlib.Path.exists", return_value=True),
@@ -193,7 +193,7 @@ async def test_explorer_submit_answer():
             return_value=mock_client,
         ),
         patch(
-            "artemis.agents.explorer.explorer.StorageManager",
+            "artemis.agents.explorer.run_setup.StorageManager",
             return_value=mock_storage,
         ),
         patch("pathlib.Path.exists", return_value=True),
@@ -339,7 +339,7 @@ async def test_explorer_submit_answer_self_correction():
             return_value=mock_client,
         ),
         patch(
-            "artemis.agents.explorer.explorer.StorageManager",
+            "artemis.agents.explorer.run_setup.StorageManager",
             return_value=mock_storage,
         ),
         patch("pathlib.Path.exists", return_value=True),
@@ -427,10 +427,10 @@ async def test_explorer_initial_visual_marking():
             return_value=mock_client,
         ),
         patch(
-            "artemis.agents.explorer.explorer.StorageManager",
+            "artemis.agents.explorer.run_setup.StorageManager",
             return_value=mock_storage,
         ),
-        patch("artemis.agents.explorer.explorer.draw_dots") as mock_draw_dots,
+        patch("artemis.agents.explorer.run_setup.draw_dots") as mock_draw_dots,
         patch("pathlib.Path.exists", return_value=True),
         patch("pathlib.Path.read_text", return_value=mock_prompt),
         patch("builtins.open", custom_open),
@@ -518,10 +518,10 @@ async def test_explorer_initial_visual_marking_previous_screenshot():
             return_value=mock_client,
         ),
         patch(
-            "artemis.agents.explorer.explorer.StorageManager",
+            "artemis.agents.explorer.run_setup.StorageManager",
             return_value=mock_storage,
         ),
-        patch("artemis.agents.explorer.explorer.draw_dots") as mock_draw_dots,
+        patch("artemis.agents.explorer.run_setup.draw_dots") as mock_draw_dots,
         patch("pathlib.Path.exists", return_value=True),
         patch("pathlib.Path.read_text", return_value=mock_prompt),
         patch("builtins.open", custom_open),
@@ -606,10 +606,10 @@ async def test_explorer_initial_visual_marking_previous_screenshot_no_ui_tree():
             return_value=mock_client,
         ),
         patch(
-            "artemis.agents.explorer.explorer.StorageManager",
+            "artemis.agents.explorer.run_setup.StorageManager",
             return_value=mock_storage,
         ),
-        patch("artemis.agents.explorer.explorer.draw_dots") as mock_draw_dots,
+        patch("artemis.agents.explorer.run_setup.draw_dots") as mock_draw_dots,
         patch("pathlib.Path.exists", return_value=True),
         patch("pathlib.Path.read_text", return_value=mock_prompt),
         patch("builtins.open", custom_open),
@@ -704,10 +704,10 @@ async def test_explorer_initial_visual_marking_previous_screenshot_ocr_fusion():
             return_value=mock_client,
         ),
         patch(
-            "artemis.agents.explorer.explorer.StorageManager",
+            "artemis.agents.explorer.run_setup.StorageManager",
             return_value=mock_storage,
         ),
-        patch("artemis.agents.explorer.explorer.draw_dots") as mock_draw_dots,
+        patch("artemis.agents.explorer.run_setup.draw_dots") as mock_draw_dots,
         patch("pathlib.Path.exists", return_value=True),
         patch("pathlib.Path.read_text", return_value=mock_prompt),
         patch("builtins.open", custom_open),
@@ -808,19 +808,19 @@ async def test_explorer_initial_visual_marking_previous_screenshot_on_the_fly_oc
             return_value=mock_client,
         ),
         patch(
-            "artemis.agents.explorer.explorer.StorageManager",
+            "artemis.agents.explorer.run_setup.StorageManager",
             return_value=mock_storage,
         ),
         patch(
-            "artemis.agents.explorer.explorer.perform_ocr",
+            "artemis.agents.explorer.run_setup.perform_ocr",
             new_callable=AsyncMock,
             return_value=mock_ocr_result,
         ) as mock_perform_ocr,
         patch(
-            "artemis.agents.explorer.explorer.is_ocr_configured",
+            "artemis.agents.explorer.run_setup.is_ocr_configured",
             return_value=True,
         ),
-        patch("artemis.agents.explorer.explorer.draw_dots") as mock_draw_dots,
+        patch("artemis.agents.explorer.run_setup.draw_dots") as mock_draw_dots,
         patch("pathlib.Path.exists", return_value=True),
         patch("pathlib.Path.read_text", return_value=mock_prompt),
         patch("builtins.open", custom_open),
@@ -933,7 +933,7 @@ async def test_explorer_denylisted_tool():
             return_value=mock_client,
         ),
         patch(
-            "artemis.agents.explorer.explorer.StorageManager",
+            "artemis.agents.explorer.run_setup.StorageManager",
             return_value=mock_storage,
         ),
         patch("pathlib.Path.exists", return_value=True),
@@ -1014,7 +1014,7 @@ async def test_explorer_inspect_region():
         patch("cv2.imwrite", return_value=True) as mock_imwrite,
         patch("pathlib.Path.mkdir") as mock_mkdir,
         patch("glob.glob", return_value=[]),
-        patch("artemis.agents.explorer.explorer.settings") as mock_settings,
+        patch("artemis.agents.explorer.perception_tools.settings") as mock_settings,
     ):
         mock_settings.TRACES_PATH = pathlib.Path("/tmp/traces")
         res = await explorer.exec_inspect_region(
@@ -1181,12 +1181,12 @@ async def test_explorer_ask_perception_tool():
     mock_draw_dots = MagicMock()
 
     with (
-        patch("artemis.agents.explorer.explorer.StorageManager") as storage_cls,
+        patch("artemis.agents.explorer.run_setup.StorageManager") as storage_cls,
         patch(
-            "artemis.agents.explorer.explorer._run_object_detection",
+            "artemis.agents.explorer.perception_tools._run_object_detection",
             return_value=mock_detector_res,
         ),
-        patch("artemis.agents.explorer.explorer.draw_dots", mock_draw_dots),
+        patch("artemis.agents.explorer.perception_tools.draw_dots", mock_draw_dots),
         patch("artemis.utils.visualization.draw_dots", mock_draw_dots),
         patch("pathlib.Path.mkdir"),
         patch("glob.glob", return_value=[]),
@@ -1277,7 +1277,7 @@ class _FakeGenaiError(Exception):
 
 @pytest.mark.asyncio
 async def test_generate_content_reliability_permanent_error_is_not_retried():
-    from artemis.agents.explorer.explorer import _generate_content_with_reliability
+    from artemis.agents.explorer.native_runner import _generate_content_with_reliability
     from artemis.llm.reliability import LLMPermanentError
 
     calls = 0
@@ -1296,7 +1296,7 @@ async def test_generate_content_reliability_permanent_error_is_not_retried():
 
 @pytest.mark.asyncio
 async def test_generate_content_reliability_bad_request_is_not_retried():
-    from artemis.agents.explorer.explorer import _generate_content_with_reliability
+    from artemis.agents.explorer.native_runner import _generate_content_with_reliability
     from artemis.llm.reliability import LLMPermanentError
 
     calls = 0
@@ -1314,7 +1314,7 @@ async def test_generate_content_reliability_bad_request_is_not_retried():
 
 @pytest.mark.asyncio
 async def test_generate_content_reliability_retries_transient_then_succeeds():
-    from artemis.agents.explorer import explorer as explorer_module
+    from artemis.agents.explorer import native_runner as native_runner_module
 
     calls = 0
     sentinel = object()
@@ -1326,8 +1326,8 @@ async def test_generate_content_reliability_retries_transient_then_succeeds():
             raise _FakeGenaiError("429 rate limit exceeded", code=429)
         return sentinel
 
-    with patch.object(explorer_module.asyncio, "sleep", new=AsyncMock()) as sleep_mock:
-        result = await explorer_module._generate_content_with_reliability(op)
+    with patch.object(native_runner_module.asyncio, "sleep", new=AsyncMock()) as sleep_mock:
+        result = await native_runner_module._generate_content_with_reliability(op)
     assert result is sentinel
     assert calls == 2
     assert sleep_mock.await_count == 1
@@ -1335,7 +1335,7 @@ async def test_generate_content_reliability_retries_transient_then_succeeds():
 
 @pytest.mark.asyncio
 async def test_generate_content_reliability_exhausts_to_typed_error():
-    from artemis.agents.explorer import explorer as explorer_module
+    from artemis.agents.explorer import native_runner as native_runner_module
     from artemis.llm.reliability import (
         FailureCategory,
         LLMExhaustedError,
@@ -1349,9 +1349,9 @@ async def test_generate_content_reliability_exhausts_to_typed_error():
         calls += 1
         raise _FakeGenaiError("503 service unavailable", code=503)
 
-    with patch.object(explorer_module.asyncio, "sleep", new=AsyncMock()):
+    with patch.object(native_runner_module.asyncio, "sleep", new=AsyncMock()):
         with pytest.raises(LLMExhaustedError) as exc_info:
-            await explorer_module._generate_content_with_reliability(op)
+            await native_runner_module._generate_content_with_reliability(op)
     assert calls == retry_policy_for(FailureCategory.PROVIDER_UNAVAILABLE).max_attempts
     assert exc_info.value.failure.category.value == "provider_unavailable"
     assert isinstance(exc_info.value.__cause__, _FakeGenaiError)