⬆️ 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/batch.md

@@ -0,0 +1,29 @@
+# BioSequenceBatch: A Container for Ordered Biological Sequences
+
+`BioSequenceBatch` is a structured data type encapsulating an ordered collection of biological sequences (`obiseq.BioSequenceSlice`) along with metadata: a `source` identifier and an integer `order`. It serves as a lightweight, immutable-friendly container for batch processing in bioinformatics pipelines.
+
+## Core Properties
+- **`source`**: String identifying the origin (e.g., file, pipeline stage).
+- **`order`**: Integer defining processing sequence or priority.
+- **`slice`**: Holds the actual sequences via `obiseq.BioSequenceSlice`.
+
+## Key Functionalities
+- **Construction**:  
+  `MakeBioSequenceBatch(source, order, sequences)` creates a new batch.
+- **Accessors**:  
+  `Source()`, `Order()` return metadata; `Slice()` exposes the sequence slice.
+- **Mutation (via copy)**:  
+  `Reorder(newOrder)` returns a new batch with updated order.
+- **Size & emptiness**:  
+  `Len()` gives sequence count; `NotEmpty()` checks non-emptiness.
+- **Consumption**:  
+  `Pop0()` removes and returns the first sequence (FIFO behavior).
+- **Safety**:  
+  `IsNil()` detects uninitialized batches; a global `NilBioSequenceBatch` sentinel exists.
+
+## Design Notes
+- Instances are value types (struct), enabling safe copying.
+- Operations follow Go idioms: methods return updated values rather than mutating in place (except internal slice mutation via `Pop0`).
+- Designed for interoperability with the OBITools4 ecosystem (`obiseq` package).
+
+This abstraction supports modular, traceable sequence processing workflows—ideal for pipeline stages where ordering and provenance matter.