⬆️ 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/kmers.md

@@ -0,0 +1,20 @@
+## BioSequence.Kmers(k int) — Semantic Description
+
+The `Kmers` method is a generator function that yields all contiguous *k*-length subsequences (called **k-mers**) from a biological sequence (`BioSequence`).  
+
+- It operates on `[]byte` data, assuming the underlying sequence is stored as a byte slice (e.g., DNA bases `A`, `C`, `G`, `T`).  
+- Uses Go’s new iterator protocol (`iter.Seq[[]byte]`) for memory-efficient, lazy evaluation.  
+- Validates input: returns an empty iterator if `k ≤ 0` or exceeds sequence length.  
+- Iterates linearly from index `i = 0` to `len(seq) - k`, extracting slices of length *k*.  
+- Each yielded value is a **non-copying slice view** (efficient, but mutable if original data changes).  
+- Supports early termination: the consumer can stop iteration by returning `false` from the yield callback.  
+- Designed for downstream tasks like sequence analysis, motif discovery, or hashing (e.g., in k-mer counting).  
+- Does *not* handle reverse-complement or ambiguous bases—assumes raw sequence input.  
+
+Usage example:  
+```go
+for kmer := range seq.Kmers(3) {
+    fmt.Printf("%s\n", string(kmer))
+}
+```  
+This yields all 3-mers (e.g., `"ACG"`, `"CGT"`...) in order.