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_planner_config.py

@@ -70,3 +70,21 @@ def test_load_config_falls_back_to_default_timeout_when_invalid_or_non_positive(
     for value in ["not-a-number", "0", "-5"]:
         config = load_config({"AI_PLANNER_TIMEOUT_SECONDS": value, **_NO_RELEVANT_VARS})
         assert config.timeout == DEFAULT_TIMEOUT_SECONDS
+
+
+def test_load_config_parses_thinking_budget_tokens() -> None:
+    config = load_config({"AI_PLANNER_THINKING_BUDGET_TOKENS": "4096"})
+
+    assert config.thinking_budget_tokens == 4096
+
+
+def test_load_config_thinking_budget_tokens_unset_defaults_to_none() -> None:
+    config = load_config(_NO_RELEVANT_VARS)
+
+    assert config.thinking_budget_tokens is None
+
+
+def test_load_config_thinking_budget_tokens_invalid_or_non_positive_gives_none() -> None:
+    for value in ["not-a-number", "0", "-1"]:
+        config = load_config({"AI_PLANNER_THINKING_BUDGET_TOKENS": value, **_NO_RELEVANT_VARS})
+        assert config.thinking_budget_tokens is None