feat: introduce MCP server, cross-platform runtime, and Showcase UI reorganization

- Showcase UI Reorganization:
  * Move web UI dashboard from root directory into apps/showcase_ui/ for cleaner project structure
  * Add 'artemis ui' CLI command (artemis/interfaces/cli/commands/ui.py) and launcher scripts for the interactive showcase console
- Standalone MCP Server & Notifiers (mcp_server/):
  * Implement dedicated MCP server package with mobile automation tools (device_state, inspect_trace, task_manager, task_runner)
  * Add multi-channel notifiers (AgentAPI, Desktop notifications, Webhooks, File output, and Composite routing)
  * Introduce background task runner and trace store for autonomous mobile execution monitoring
- Cross-Platform Runtime & Toolchain Support:
  * Add artemis/platform/ with OS-specific implementations for Linux, macOS (Darwin), and Windows
  * Add artemis/runtime/supervisor.py for resilient process and agent runtime supervision
  * Add artemis/toolchain/ with dependency resolution and SDK descriptors
  * Add cross-platform launcher scripts (start.sh, start.bat) and installer scripts (scripts/install_deps.*)
- Core Enhancements & Diagnostics:
  * Enhance coordinate normalization, OCR API fallback, and perception pipeline
  * Add credential validation (credentials_validator.py) and system diagnostics
  * Update bilingual documentation (README.md, README_CN.md) and architecture diagrams
- Test Suite Expansion:
  * Add integration tests for cloud gateway, remote ADB, and Artemis login
  * Add unit tests covering core diagnostics, platform detection, toolchain, credentials validator, optional OCR, and MCP tools

tests/unit/test_planner.py

@@ -13,10 +13,12 @@
 # limitations under the License.
 
 import asyncio
-from pathlib import Path
 from artemis.agents.planner.planner import run_async_planner_validation
 
 
+from pathlib import Path
+
+
 class DummyDataEngine:
     def get_agent_friendly_steps(self):
         return []
@@ -24,23 +26,39 @@ class DummyDataEngine:
 
 class DummyCtx:
     data_engine = DummyDataEngine()
-    project_dir = str(Path(__file__).resolve().parent.parent.parent)
+    project_dir = str(Path(__file__).resolve().parents[2])
 
 
-async def test():
+import pytest
+from unittest.mock import AsyncMock, MagicMock, patch
+from artemis.agents.planner.planner import ValidationResult
+
+
+@pytest.mark.asyncio
+async def test_planner_validation():
     content_before = "- [/] Click the button\n- [ ] Complete task"
     content_after = (
         "- [/] Click the button\n- [ ] Complete task\n- [ ] New subgoal appended at bottom"
     )
-    res = await run_async_planner_validation(
-        ctx=DummyCtx(),
-        initial_goal="Do the task",
-        content_before=content_before,
-        content_after=content_after,
-        operator_raw_thinking="I need to add a new subgoal",
-        operator_native_thinking="Thinking...",
+    mock_llm = MagicMock()
+    mock_structured = MagicMock()
+    mock_structured.ainvoke = AsyncMock(
+        return_value=ValidationResult(is_approved=True, feedback="Valid plan modification")
     )
-    print(res)
+    mock_llm.with_structured_output.return_value = mock_structured
+
+    with patch("artemis.agents.planner.planner.get_llm", return_value=mock_llm):
+        res = await run_async_planner_validation(
+            ctx=DummyCtx(),
+            initial_goal="Do the task",
+            content_before=content_before,
+            content_after=content_after,
+            operator_raw_thinking="I need to add a new subgoal",
+            operator_native_thinking="Thinking...",
+        )
+    assert res is not None
+    assert res.get("status") == "success"
 
 
-asyncio.run(test())
+if __name__ == "__main__":
+    asyncio.run(test_planner_validation())