feat(planner): persist reusable action semantics

apps/device-host-agent/tests/test_cloud_planner_client.py

@@ -36,7 +36,14 @@ def test_decide_returns_tool_call_decision_on_success() -> None:
         seen_requests.append(request)
         return httpx.Response(
             200,
-            json={"tool_name": "tap", "arguments": {"x": 1, "y": 2}},
+            json={
+                "tool_name": "tap",
+                "arguments": {"x": 1, "y": 2},
+                "rationale": "The button is visible. Opening it.",
+                "thinking": "A tap should navigate to the next page.",
+                "purpose": "Open the next page.",
+                "expected_outcome": "The next page is visible.",
+            },
         )
 
     client = _client(handler)
@@ -49,7 +56,14 @@ def test_decide_returns_tool_call_decision_on_success() -> None:
         timeout=30.0,
     )
 
-    assert decision == ToolCallDecision(tool_name="tap", arguments={"x": 1, "y": 2})
+    assert decision == ToolCallDecision(
+        tool_name="tap",
+        arguments={"x": 1, "y": 2},
+        text_output="The button is visible. Opening it.",
+        thinking="A tap should navigate to the next page.",
+        purpose="Open the next page.",
+        expected_outcome="The next page is visible.",
+    )
     assert len(seen_requests) == 1
     request = seen_requests[0]
     assert request.url.path == "/internal/v1/hosts/host-a/planner/decide"