⬆️ 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_classifier.md

@@ -0,0 +1,26 @@
+# Taxonomic Classification via `TaxonomyClassifier`
+
+The `obiseq` package provides a taxonomic classification mechanism through the `TaxonomyClassifier` function.
+
+- **Purpose**: Constructs a reusable classifier for biological sequences based on taxonomic hierarchy.
+- **Inputs**:
+  - `taxonomicRank`: Target rank (e.g., `"species"`, `"genus"`).
+  - `taxonomy`: Reference taxonomy (`*obitax.Taxonomy`), with fallback via `.OrDefault(true)`.
+  - `abortOnMissing`: Boolean flag to enforce strict taxon resolution.
+
+- **Core Logic**:
+  - For each sequence, retrieves its `Taxon`, then drills down to the requested rank using `.TaxonAtRank()`.
+  - If `abortOnMissing` is true, exits on failure to resolve the taxon or rank.
+  - Internally maps `*TaxNode`s to integer codes for efficient storage/comparison.
+
+- **Returned Object (`BioSequenceClassifier`)**:
+  - `Code(sequence) int`: Assigns a unique integer code to the taxonomic assignment of a sequence.
+  - `Value(code) string`: Returns the scientific name corresponding to a code.
+  - `Reset()`: Reinitializes internal mappings (useful for batch processing).
+  - `Clone() *BioSequenceClassifier`: Creates a fresh, identical classifier instance.
+
+- **Design Rationale**:
+  - Uses integer codes to avoid repeated string operations and enable fast indexing (e.g., for counting).
+  - Supports both strict (`abortOnMissing=true`) and lenient classification modes.
+
+This design enables scalable, efficient taxonomic profiling of sequencing datasets.