v1.16.2 Add type-to-zone mapping for memory graph visualization

Enhanced

• Memory Graph Type-to-Zone Mapping: New context types now automatically map to appropriate visualization zones
  • Added typeToZone mapping system to categorize 22+ context types into 6 visual regions
  • Code types (code_create, code_modify, code_refactor, etc.) → Blue Code/Test zone
  • Bug types (bug_fix, bug_report, bug_analysis) → Red Error zone
  • Feature types (feature_add, feature_update, feature_improvement) → Green Solution zone
  • Documentation types (docs_update) → Purple Documentation zone
  • Configuration types (dependency_update) → Pink Configuration zone
  • All 14 new fine-grained types properly cluster in their semantic zones