- Clear _in_memory_loggers before/after each test to prevent cached logger
instances (LangsmithLogger, SlackAlerting, etc.) from leaking stale state
- Add pre_call_rules, post_call_rules to list attrs save/restore
- Add vector_store_registry to scalar attrs save/restore
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>