v0.18.1

Added

• memory_knowledge_search and memory_values_search accept no_cjk_expand flag to suppress CJK n-gram expansion when exact matching is preferred
• memory_knowledge_search and memory_values_search accept include_full_content flag to return full content, sources/evidence, and timestamps alongside the default summary
• memory_knowledge_update and memory_values_update responses now include updated_fields listing which fields were changed
• memory_knowledge_add docstring documents accepted sources object schema ({type, ref, summary}) and valid type values

Fixed

• memory_values_add and memory_values_update evidence date validation now shows ISO 8601 format hint (YYYY-MM-DD) instead of generic missing-field message
• memory_values_demote for non-promoted entries now returns structured state_error with actionable hint instead of a generic error