⬆️ 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/obiutils/bytes_test.md

@@ -0,0 +1,20 @@
+# `obiutils` Package Functional Overview
+
+The `obiutils` package provides two core utility functions for low-level and numerical operations in Go:
+
+- **`InPlaceToLower([]byte) []byte`**  
+  Converts all ASCII uppercase letters in a byte slice to lowercase *in-place*, returning the modified slice.  
+  - Non-alphabetic bytes remain unchanged.  
+  - Memory-efficient: modifies input directly (no allocation of new slice).  
+
+- **`Make2DNumericArray[T any](rows, cols int, zeroed bool) Matrix[T]`**  
+  Generates a generic 2D numeric array (`Matrix`) of type `T`, supporting any comparable/numeric Go type.  
+  - Parameters: number of rows, columns, and whether to initialize with zero values (`true`) or default `T` (e.g., 0 for int).  
+  - Uses Go generics (`[T any]`) for type safety and flexibility.  
+
+Both functions are thoroughly unit-tested in `*_test.go`, covering edge cases:
+- Empty/nil inputs (`InPlaceToLower`)
+- Various dimensions and zero-initialization modes (`Make2DNumericArray`)
+
+Tests use `reflect.DeepEqual` for structural comparison and subtests via `t.Run`.  
+The package assumes a custom type alias: `type Matrix[T any] [][]T`.