⬆️ 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/obiseq/taxonomy_workers.md

@@ -0,0 +1,22 @@
+# Taxonomic Annotation Workers in `obiseq`
+
+This Go package provides functional workers for annotating biological sequences with taxonomic information using a hierarchical taxonomy (e.g., from NCBI or UNITE). Each worker is implemented as a `SeqWorker`—a function that processes one sequence and returns an updated slice of sequences.
+
+- **`MakeSetTaxonAtRankWorker(taxonomy, rank)`**:  
+  Assigns a taxonomic label at *a specific rank* (e.g., `"genus"`, `"family"`). Validates that the requested `rank` exists in the taxonomy before proceeding.
+
+- **`MakeSetSpeciesWorker(taxonomy)`**:  
+  Annotates each sequence with its inferred species name using the provided taxonomy.
+
+- **`MakeSetGenusWorker(taxonomy)`**:  
+  Adds genus-level taxonomic assignment to sequences.
+
+- **`MakeSetFamilyWorker(taxonomy)`**:  
+  Adds family-level taxonomic assignment.
+
+- **`MakeSetPathWorker(taxonomy)`**:  
+  Populates the full taxonomic path (e.g., `"Eukaryota;Metazoa;Chordata;..."`) for each sequence.
+
+All workers rely on methods of `BioSequence` (e.g., `.SetSpecies()`, `.SetPath()`), which internally use the `obitax.Taxonomy` object to resolve taxonomic IDs or names. Errors are logged via `logrus`; invalid ranks cause a fatal exit.
+
+These utilities support modular, pipeline-friendly taxonomic annotation—ideal for high-throughput metabarcoding workflows.