Implements a ProvenanceBuffer that captures graph mutations with hash-linked entries, threshold-based flush, and edge evidence sidecars. The buffer supports W3C PROV-O flavored provenance and can be extracted as a standalone audit log component for any system requiring tamper-evident change tracking. It uses SHA256 hashing and a monotonic counter for ordering.

A generic ClosingLRUCache class that wraps database adapters with LRU eviction and ensures async cleanup on eviction via an on_evict callback. It uses collections.OrderedDict for O(1) access and eviction, and schedules the close coroutine in the event loop. This is a reusable pattern for managing expensive connections or engines in async Python applications.

A standalone URL validation module that blocks Server-Side Request Forgery attacks by rejecting internal IP ranges, disallowed schemes, and performing DNS rebinding checks. It uses ipaddress module for IP validation and can be reused in any Python web scraper or proxy to safely restrict outbound requests.

Defines a layer composition pattern for a force-directed graph visualization. The useBusinessScene hook merges multiple named layers (governance, content) into a single scene by combining node/link arrays. The pattern is extensible via a registry with three mechanical edits (add layer implementation, register it, consume in hook). This is a clean frontend pattern for building modular, composable graph overlays.