⬆️ version bump to v4.5

- Update obioptions.Version from "Release 4.4.29" to "/v/ Release v5"
- Update version.txt from 4.29 → .30
(automated by Makefile)

autodoc/docmd/pkg/obiformats/taxonomy_read.md

@@ -0,0 +1,34 @@
+# Taxonomy Loading Module (`obiformats`)
+
+This Go package provides semantic functionality to automatically detect and load taxonomic data from various file formats. It supports flexible, format-agnostic taxonomy ingestion via a unified interface.
+
+## Core Features
+
+1. **Format Detection**  
+   - `DetectTaxonomyFormat(path)` identifies the taxonomy source format by inspecting file type (directory, MIME-type), filename patterns, or structure.
+   - Supports:  
+     • NCBI Taxdump (both directory and `.tar` archive)  
+     • CSV files (`text/csv`)  
+     • FASTA/FASTQ sequences (via `mimetype` detection)  
+
+2. **Modular Loaders**  
+   - Returns a typed `TaxonomyLoader` function, enabling deferred loading with configurable options (`onlysn`, `seqAsTaxa`).  
+   - Each loader abstracts format-specific parsing (e.g., NCBI `nodes.dmp`, FASTA header taxonomy extraction).
+
+3. **Sequence-Based Taxonomy Extraction**  
+   - For sequence files (FASTA/FASTQ), taxonomy is inferred from headers or associated metadata, using `ExtractTaxonomy()`.
+
+4. **Integration with OBITools Ecosystem**  
+   - Leverages `obitax.Taxonomy` as the canonical output structure.  
+   - Uses custom MIME-type registration (`obiutils.RegisterOBIMimeType()`) for robust detection of bioinformatics formats.
+
+5. **Error Handling & Logging**  
+   - Graceful failure with descriptive errors; informative logging via `logrus`.
+
+## Usage Flow
+
+```go
+tax, err := LoadTaxonomy("path/to/data", onlysn=true, seqAsTaxa=false)
+```
+
+The module enables interoperability across taxonomic data sources in metabarcoding workflows.