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_cloud_repository_contract.py

@@ -1751,3 +1751,62 @@ def test_prune_planner_decision_log_deletes_only_old_terminal_tasks(
         )
     finally:
         database.close()
+
+
+def test_record_planner_decision_stores_rationale_and_thinking(
+    database_url: str,
+) -> None:
+    database = CloudDatabase(database_url)
+    task_id = _unique_id("reflect-task")
+    host_id = _unique_id("reflect-host")
+    now = datetime(2026, 7, 15, 0, 0, tzinfo=UTC)
+
+    try:
+        database.repository.record_planner_decision(
+            host_id=host_id,
+            task_id=task_id,
+            attempt=1,
+            system_prompt="system",
+            user_prompt="user",
+            tool_name="tap",
+            arguments_json='{"x": 1}',
+            now=now,
+            rationale="Previous step opened settings. Now tapping account.",
+            thinking="I need to navigate to account settings.",
+        )
+
+        decisions = database.repository.list_planner_decisions(task_id=task_id, attempt=1)
+        assert len(decisions) == 1
+        assert decisions[0].rationale == "Previous step opened settings. Now tapping account."
+        assert decisions[0].thinking == "I need to navigate to account settings."
+    finally:
+        database.close()
+
+
+def test_record_planner_decision_stores_null_rationale_and_thinking(
+    database_url: str,
+) -> None:
+    database = CloudDatabase(database_url)
+    task_id = _unique_id("reflect-null-task")
+    host_id = _unique_id("reflect-null-host")
+    now = datetime(2026, 7, 15, 0, 0, tzinfo=UTC)
+
+    try:
+        database.repository.record_planner_decision(
+            host_id=host_id,
+            task_id=task_id,
+            attempt=1,
+            system_prompt="system",
+            user_prompt="user",
+            tool_name="tap",
+            arguments_json="{}",
+            now=now,
+            # rationale and thinking omitted (default None)
+        )
+
+        decisions = database.repository.list_planner_decisions(task_id=task_id, attempt=1)
+        assert len(decisions) == 1
+        assert decisions[0].rationale is None
+        assert decisions[0].thinking is None
+    finally:
+        database.close()