Module manager 

Unified Memory Manager: composes all memory layers into a single API.

Layers (in query order):

1. Graph (optional) — Grafeo for relationship-aware recall
2. Memdir — flat file scanning for MEMORY.md and topic files
3. CLAUDE.md — hierarchical instruction loading
4. Session storage — JSONL transcript persistence

The manager delegates to the appropriate layer for each operation.

Structs

MemoryManager

Unified memory manager composing all layers.