⬆️ 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/csvtaxdump_read.md

@@ -0,0 +1,27 @@
+## CSV Taxonomy Loader for OBITools4
+
+This Go module provides a function `LoadCSVTaxonomy` to parse and load taxonomic data from CSV files into an internal taxonomy structure.
+
+### Key Features:
+- **Robust CSV Parsing**: Uses Go’s `encoding/csv` with configurable options (comment lines, lazy quotes, whitespace trimming).
+- **Column Mapping**: Dynamically identifies required columns: `taxid`, `parent`, `scientific_name`, and `taxonomic_rank`.
+- **Error Handling**: Validates presence of all required columns; fails early with descriptive errors.
+- **Taxonomy Construction**:
+  - Builds a hierarchical taxonomy using `obitax.Taxon` objects.
+  - Ensures existence of a root node; returns error otherwise.
+- **Metadata Extraction**:
+  - Derives taxonomy name and short code (e.g., prefix before `:` in first taxid).
+  - Logs key metadata for traceability.
+- **Scalable Design**:
+  - Processes records line-by-line (memory-efficient).
+  - Supports large datasets via streaming CSV reading.
+
+### Input Format:
+CSV must contain exactly four columns (case-sensitive headers):
+- `taxid`: Unique taxon identifier.
+- `parent`: Parent taxonomic node ID (empty for root).
+- `scientific_name`: Binomial or descriptive name.
+- `taxonomic_rank`: e.g., *species*, *genus*.
+
+### Output:
+Returns a fully populated `obitax.Taxonomy` object ready for downstream phylogenetic or sequence classification tasks.