Module cache 

Cached index metadata and access tracking for session management.

CachedIndex wraps a CodeGraph (unified graph format) with lightweight bookkeeping so the session manager can implement LRU and idle eviction without cloning large data structures.

Structs

AtomicInstant

Minimal atomic wrapper for Instant using a mutex (Instant lacks atomics).

CachedIndex

Wrapper around a CodeGraph with access metadata for eviction policies.