⬆️ 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/obikmer/skm_reader.md

@@ -0,0 +1,24 @@
+# SKM File Reader for Super-Kmers
+
+This Go package provides a binary file reader (`SkmReader`) for `.skm` files, which store *super-kmers* — compact representations of DNA sequences using 2-bit encoding.
+
+## Core Functionality
+
+- **Binary Format Parsing**: Reads structured data from `.skm` files, where each record contains:
+  - A 2-byte little-endian integer specifying the sequence length.
+  - Packed nucleotide data, where every byte encodes up to four bases (2 bits per base).
+
+- **Decoding Logic**: Converts packed 2-bit codes (`00`, `01`, `10`, `11`) to nucleotide characters using the mapping:  
+  `{ 'a', 'c', 'g', 't' }`.
+
+- **Memory-Efficient Reading**: Uses buffered I/O (64 KiB buffer) for fast sequential access.
+
+- **Streaming Interface**: `Next()` returns the next super-kmer as a struct with:
+  - `Sequence`: decoded nucleotide byte slice.
+  - `Start`, `End`: positional metadata (currently fixed to full length).
+
+- **Resource Management**: Provides a clean `.Close()` method for file handle cleanup.
+
+## Use Case
+
+Designed for high-performance processing of large genomic datasets (e.g., in k-mer analysis or sequence indexing), where storage size and read speed are critical.