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

packages/cloud-platform/cloud/repository.py

@@ -134,6 +134,8 @@ class PlannerDecisionRecord:
     tool_name: str
     arguments_json: str
     created_at: datetime
+    rationale: str | None = None
+    thinking: str | None = None
 
 
 class CloudRepository(Protocol):
@@ -518,6 +520,8 @@ class CloudRepository(Protocol):
         tool_name: str,
         arguments_json: str,
         now: datetime,
+        rationale: str | None = None,
+        thinking: str | None = None,
     ) -> int:
         """Insert one planner-decision log row, returning the assigned step_index.