⬆️ 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/obistats/stats.md

@@ -0,0 +1,25 @@
+# `obistats` Package — Semantic Overview
+
+The `*obistats*` Go package provides lightweight, type-generic statistical utilities for numerical data.
+
+## Core Functions
+
+- **`Median[T Number](data []T) float64`**  
+  Computes the median of a slice. Internally copies and sorts input data to avoid mutation, handling both even- and odd-length slices correctly. Returns `0` for empty input.
+
+- **`Mean[T Number](data []T) float64`**  
+  Calculates the arithmetic mean by summing all elements (converted to `float64`) and dividing by count.
+
+## Type Constraints
+
+- Uses Go generics (`constraints.Float | constraints.Integer`), enabling use with `int`, `float32`, `float64`, etc.
+
+## Design Notes
+
+- Non-mutating (`Median` works on a copy).
+- Simple, efficient implementations—no external dependencies beyond `golang.org/x/exp/constraints` and `slices`.
+- Focused on central tendency measures only—no variance, std dev, or distribution stats.
+
+## Use Case
+
+Ideal for small-to-medium numerical datasets where minimal dependencies and clarity are prioritized over advanced statistics.