⬆️ 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/csviterator.md

@@ -0,0 +1,24 @@
+# `CSVTaxaIterator` Function — Semantic Description
+
+The function `CSVTaxaIterator`, part of the `obiformats` package, converts a taxonomic iterator (`*obitax.ITaxon`) into an **incremental CSV record generator** via `obiitercsv.ICSVRecord`. It enables streaming, batched export of taxonomic data to CSV format with configurable fields.
+
+### Core Functionality:
+- **Input**: A pointer-based taxonomic iterator (`*obitax.ITaxon`) and optional configuration via `WithOption`.
+- **Output**: An asynchronous CSV record iterator (`*obiitercsv.ICSVRecord`) that yields batches of records.
+
+### Configurable Output Fields (via options):
+- `query`: Taxon-associated query identifier, if enabled (`WithPattern`).
+- `taxid`: Either raw node ID (e.g., string pointer) or formatted taxon path (`WithRawTaxid` toggle).
+- `parent`: Parent taxonomic ID or string representation, if enabled (`WithParent`).
+- `taxonomic_rank`: Taxon rank (e.g., "species", "genus").
+- `scientific_name`: Full scientific name of the taxon.
+- Custom metadata fields: Specified via `WithMetadata`, extracted from taxon metadata store.
+- `path`: Full lineage path (e.g., "k__Bacteria; p__; c__..."), if enabled (`WithPath`).
+
+### Implementation Highlights:
+- Uses **goroutines** for non-blocking push of batches and clean shutdown (`WaitAndClose`, `Done`).
+- Supports **batching** (configurable via `BatchSize`) to optimize I/O.
+- Dynamically builds CSV headers based on selected options before processing begins.
+
+### Use Case:
+Efficient, memory-light conversion of large taxonomic datasets (e.g., from classification pipelines) into structured CSV for downstream analysis or reporting.