⬆️ 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/distribute.md

@@ -0,0 +1,32 @@
+# `IDistribute`: Semantic Description of Biosequence Distribution Functionality
+
+The `IDistribute` type implements a thread-safe mechanism for distributing biosequences into classified, batched outputs.
+
+- **Core Purpose**: Enables concurrent processing of sequences by routing them to dedicated output channels based on classification keys.
+
+- **Key Fields**:
+  - `outputs`: A map from integer class codes to output streams (`IBioSequence`).
+  - `news`: An unbuffered channel emitting class codes when new output streams are created.
+  - `classifier`: A pointer to a sequence classifier used to assign sequences to keys during distribution.
+
+- **Thread Safety**: All access to shared state (`outputs`, `slices`) is synchronized via a mutex.
+
+- **Batching Strategy**:
+  - Sequences are accumulated per class key until either `BatchSizeMax()` sequences or `BatchMem()` bytes (per key) are reached.
+  - Batches are flushed automatically and on finalization.
+
+- **Asynchronous Processing**:
+  - The `Distribute()` method launches a goroutine that consumes the input iterator, classifies each sequence, and feeds batches to per-key outputs.
+  - Outputs are closed only after all sequences have been processed.
+
+- **Notifications**:
+  - The `News()` channel allows consumers to be notified of newly created output streams (i.e., when a new class key appears).
+
+- **Error Handling**:
+  - `Outputs(key)` returns an error if the requested key has no associated output.
+
+- **Integration**:
+  - Leverages `obidefault.BatchSizeMax()` and `BatchMem()` for configurable batch limits.
+  - Uses `SortBatches()` on the input iterator to ensure ordered processing.
+
+In summary, `IDistribute` provides a scalable, concurrent pipeline for classifying and batching biosequences based on user-defined classification logic.