feat(minecraft): expose LLM log to runtime for introspection

Add LlmLogEntry interface with id/turnId/kind/timestamp/eventType/sourceType/sourceId/tags/text/metadata fields, implement createLlmLogRuntime helper exposing query API with chainable filters (byTurn/byKind/byEventType/byTag/last/list/count/clear), track llmLogEntries array with appendLlmLog method logging turn_input/llm_attempt/planner_result/planner_error/feedback/scheduler events, inject llmLog/currentInput globals

Author: shinohara-rin