feat: release 2.2.0 with PC-only tests and execution reliability fixes

Unify task scheduling and queue state, fix Android input and observation recovery, preserve screenshot paths, and match final review criteria accurately. Add collapsible copyable results and publish the complete 2.1.0 upgrade notes. Validation: 3189 backend tests, 326 frontend tests, 24 client tests, production build and quality gates.

artemis/utils/input_state.py

@@ -54,6 +54,13 @@ def input_state(node: dict[str, Any]) -> dict[str, Any]:
     }
 
 
+def expected_input_state(text: str, clear_existing: bool) -> str | None:
+    """Empty replacement means clear; empty append has no value postcondition."""
+    if text:
+        return "present"
+    return "empty" if clear_existing else None
+
+
 def verify_input(elements: list[dict], target: dict | None = None) -> str:
     """Verify value presence against a fresh tree, without returning its value.