feat: prepare 2.2.0 with UI and execution fixes

Add dark theme, richer Markdown and readable plugin results.
Improve Android input evidence, response integrity and diagnostics.
Unify lifecycle, guidance receipts and evidence sources across clients.
Keep direct action dispatch without an added AI quota approval layer.
Align version metadata at 2.2.0 and bundle Helper 1.2.2.

Validation: 3063 backend tests before the version bump; 44 after.
Frontend: 317 tests and production build passed.

tests/unit/mcp/test_action_executor_semantics.py

@@ -27,6 +27,7 @@ from unittest.mock import Mock
 import pytest
 
 from artemis.mcp.action_executor import McpActionExecutor, _ArgError
+from artemis.utils.action_target import observation_anchor
 
 
 def _make_executor(width=1080, height=2400):
@@ -90,6 +91,8 @@ def test_click_index_resolves_to_the_elements_center_and_records_observed_fields
         "target_bounds": [37, 480, 963, 560],
         "target_resource_id": "android:id/title",
         "target_class": "android.widget.TextView",
+        "target_index": 1,
+        **observation_anchor(_indexed_state()),
     }
     assert "target_description" not in recorded