Module persistence 

Persistence Layer for RuVector Discovery Framework

This module provides serialization/deserialization for the OptimizedDiscoveryEngine and discovered patterns. Supports:

• Full engine state save/load
• Pattern-only save/load/append
• Optional gzip compression for large datasets
• Incremental pattern appends without rewriting entire files

Structs

EngineState

Serializable state of the OptimizedDiscoveryEngine

PersistenceOptions

Options for saving/loading with compression

Functions

append_patterns

Append new patterns to an existing patterns file

compression_info

Calculate compression ratio for a file

get_file_size

Get file size in bytes

load_engine

Load an OptimizedDiscoveryEngine from a saved state file

load_patterns

Load patterns from a JSON file

save_engine

Save the OptimizedDiscoveryEngine state to a file

save_patterns

Save discovered patterns to a JSON file