feat(runtime): add planner reflection history with rationale and thinking

- ToolCallDecision captures thinking blocks and pre-tool text output
- AnthropicToolCallingClient supports optional extended thinking (budget_tokens + beta header)
- PlannedStep carries rationale and thinking from each LLM decision
- WorldEvent replaces scene_summary with rationale/thinking/page fields (backward-compatible)
- AI planner system prompt instructs reflection before each tool call
- _history_summary() emits compact {page, rationale, action, success} dicts
- Cloud DB migration 0011 adds nullable rationale/thinking columns to planner_decision_log
- OpenAI client extracts reasoning_content into thinking field

tests/test_world_models.py

@@ -27,9 +27,9 @@ def test_world_event_and_state_to_dict() -> None:
         widgets=[SemanticWidget(element_id="send", purpose="send message")],
     )
     event = WorldEvent(
-        scene_summary=semantic_scene,
         action="tap",
         success=True,
+        scene_summary=semantic_scene,
     )
     state = WorldState.with_history_bound(2)
     state.current_app = "com.example.chat"
@@ -51,10 +51,38 @@ def test_world_event_and_state_to_dict() -> None:
 def test_world_state_history_evicts_oldest_entry_at_bound() -> None:
     state = WorldState.with_history_bound(2)
 
-    state.history.append(WorldEvent(_scene(), "first", True))
-    state.history.append(WorldEvent(_scene(), "second", True))
-    state.history.append(WorldEvent(_scene(), "third", True))
+    state.history.append(WorldEvent(action="first", success=True))
+    state.history.append(WorldEvent(action="second", success=True))
+    state.history.append(WorldEvent(action="third", success=True))
 
     assert len(state.history) == 2
     assert [event.action for event in state.history] == ["second", "third"]
     assert state.history.maxlen == 2
+
+
+def test_world_event_with_rationale_thinking_page() -> None:
+    event = WorldEvent(
+        action="tap",
+        success=True,
+        rationale="Previous step opened settings. Now tapping account.",
+        thinking="I should navigate to account settings.",
+        page="Settings",
+    )
+    data = event.to_dict()
+
+    assert data["rationale"] == "Previous step opened settings. Now tapping account."
+    assert data["thinking"] == "I should navigate to account settings."
+    assert data["page"] == "Settings"
+    assert data["scene_summary"] is None
+
+
+def test_world_event_all_optional_fields_none() -> None:
+    event = WorldEvent(action="swipe", success=False)
+    data = event.to_dict()
+
+    assert data["rationale"] is None
+    assert data["thinking"] is None
+    assert data["page"] is None
+    assert data["scene_summary"] is None
+    assert data["action"] == "swipe"
+    assert data["success"] is False