Module hierarchical 

Hierarchical catalog structure for assemblies and distributions.

This module provides a hierarchical catalog structure: HierarchicalCatalog → HierarchicalAssembly → AssemblyVersion → FastaDistribution

This structure allows:

• Clear relationships between assemblies and their versions
• Multiple FASTA distributions per assembly version
• Per-contig presence tracking (in report, in FASTA, or both)
• Fast lookup by MD5 or name+length

Structs

CatalogIndex

Indexes for fast lookup

ContigLocation

Location of a contig in the catalog

DistributionRef

Reference to a distribution with its context

HierarchicalCatalog

Hierarchical catalog with assemblies, versions, and distributions

InferredAssembly

Result of inferring the base assembly for a set of contigs