⬆️ 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/goutils.md

@@ -0,0 +1,16 @@
+# `obiutils` Package Overview
+
+This Go package provides utility functions for common data conversion, serialization, and reflection tasks.
+
+- **Custom Error Types**: Defines typed errors (`NotAnInteger`, `NotAFloat64`, etc.) for precise type validation failures.
+- **Interface-to-Type Casting**: Offers robust conversion functions:
+  - `InterfaceToFloat64Map`, `InterfaceToIntSlice`, etc., handling nested interfaces and type coercion (e.g. `int` → `float64`, slices of `interface{}`).
+- **File I/O**: `ReadLines` reads a file line-by-line into a string slice, handling buffered reading efficiently.
+- **Concurrency**: `AtomicCounter` returns an incrementing integer generator—thread-safe via mutex, optionally starting from a given value.
+- **JSON Serialization**: `JsonMarshal` and `JsonMarshalByteBuffer` provide UTF‑8–preserving JSON encoding (avoids Go’s default HTML escaping).
+- **Reflection Helpers**:
+  - `IsAMap`, `IsASlice`, `IsAnArray` detect container types.
+  - `HasLength`, `Len`, and `IsAContainer` abstract length operations across maps, slices, arrays, or custom types with a `.Len()` method.
+- **Deep Copying**: `MustFillMap` performs deep copying of nested structures using `go-deepcopy`.
+
+All functions prioritize safety, type correctness, and usability in data-heavy or concurrent applications.