Incremental Package Fetch With Deduplication And Update Detection

Fetch source code for npm packages to give AI coding agents deeper context

Unique: Implements metadata-driven incremental fetching with deduplication that skips already-cloned packages and only updates changed versions, rather than always performing full clones or requiring manual tracking of what's been fetched

vs others: Faster than running git clone for every package because it maintains a metadata index and skips clones for unchanged versions; more reliable than filesystem-based detection because metadata is explicit and version-aware