⬆️ 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/obifp/uint128_test.md

@@ -0,0 +1,17 @@
+# `obifp.Uint128` Package — Semantic Feature Overview
+
+This Go package provides a 128-bit unsigned integer type (`Uint128`) with comprehensive arithmetic, comparison, and bitwise operations. Internally represented as two `uint64` limbs (`w1`: high, `w0`: low), it supports:
+
+- **Arithmetic Operations**  
+  - `Add`, `Sub`, `Mul` (128×128), and `Mul64` (scalar multiplication)  
+  - Division: `Div`, `Mod`, and combined quotient/remainder via `QuoRem` (and their 64-bit variants)  
+- **Comparison & Equality**  
+  - `Cmp`, `Equals`, `LessThan`/`GreaterThan`, and their inclusive variants (`≤`, `≥`)  
+  - Support for comparing against both `Uint128` and native `uint64` values  
+- **Bitwise Operations**  
+  - Logical AND (`And`), OR (`Or`), XOR (`Xor`) between two `Uint128`s  
+  - Bitwise NOT (`Not`) — inverts all bits of the value  
+- **Conversion & Utility**  
+  - `AsUint64()` safely truncates to lower 64 bits (assumes upper limb is zero)  
+
+All operations handle overflow/underflow correctly, including carry propagation in addition and borrow handling in subtraction. Tests cover edge cases: zero values, max `uint64` boundaries (e.g., wrapping in addition/subtraction), and large multiplications. Designed for cryptographic or high-precision numeric use where native integer types are insufficient.