⬆️ 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/obiiter/extract_taxonomy.md

@@ -0,0 +1,24 @@
+# `ExtractTaxonomy` Function — Semantic Description
+
+The `ExtractTaxonomy` method is a core utility in the `obiiter` package, designed to aggregate taxonomic information across biological sequences processed by an iterator.
+
+- **Input**:  
+  - A pointer to `IBioSequence`, representing a sequence iterator over biological data.  
+  - A boolean flag `seqAsTaxa`: if true, each full sequence is treated as a single taxonomic unit; otherwise, individual elements within slices are processed separately.
+
+- **Process**:  
+  - Iterates through all sequences via `iterator.Next()` and retrieves each current slice using `Get().Slice()`.  
+  - For every slice, it calls the underlying `.ExtractTaxonomy()` method (from `obitax`), progressively building or updating a shared `*obitax.Taxonomy` object.  
+  - Stops and returns immediately upon encountering the first error during taxonomy extraction.
+
+- **Output**:  
+  - Returns a fully populated `*obitax.Taxonomy` object (or partial result if early failure occurs).  
+  - Returns `nil` error on success; otherwise, returns the first encountered error.
+
+- **Semantic Role**:  
+  Enables scalable taxonomic profiling of high-throughput sequencing data by delegating per-slice extraction logic to the `obitax` module, while ensuring robust iteration and error handling.
+
+- **Dependencies**:  
+  Relies on `obitax.Taxonomy` for structured taxonomic representation and assumes slices implement the `.ExtractTaxonomy()` interface.
+
+This function exemplifies a *map-reduce*-style pattern: mapping taxonomy extraction over slices, and reducing results into a unified taxonomic summary.