⬆️ 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/varint_test.md

@@ -0,0 +1,37 @@
+# Varint Encoding and Decoding Module (`obikmer`)
+
+This Go package implements **variable-length integer encoding/decoding**, commonly used in binary protocols (e.g., Protocol Buffers, SQLite) to efficiently store small integers using fewer bytes.
+
+## Core Features
+
+- **`EncodeVarint(w io.Writer, v uint64) (n int, err error)`**  
+  Encodes a `uint64` value into the minimal number of bytes (1–10) using **LEB128-style varint**, writing the result to a writer. Returns bytes written and any I/O error.
+
+- **`DecodeVarint(r io.Reader) (uint64, error)`**  
+  Reads and decodes a varint from an `io.Reader`, reconstructing the original `uint64`. Fails on malformed or incomplete data.
+
+- **`VarintLen(v uint64) int`**  
+  Computes the exact number of bytes required to encode `v`, without performing I/O.
+
+## Test Coverage
+
+- **Round-trip correctness**: All test values (including edge cases like `0`, powers of two, and max `uint64`) encode → decode back identically.
+- **Length validation**: Encoded length matches `VarintLen` predictions exactly (e.g., 127 → 1 byte; 16384 → 3 bytes).
+- **Sequence handling**: Multiple varints can be concatenated and decoded in order, preserving data integrity.
+
+## Efficiency & Design
+
+- Uses **7-bit groups per byte**, with the MSB as a continuation flag (`1` = more bytes follow).
+- Minimal memory footprint — no allocations beyond buffer I/O.
+- Designed for streaming use (e.g., network or file serialization).
+
+## Edge Cases Verified
+
+| Value          | Encoded Length |
+|----------------|---------------|
+| `0`            | 1 byte        |
+| `2⁷−1 = 127`   | 1 byte        |
+| `2⁷ = 128`     | 2 bytes       |
+| `2¹⁴−1 = 16383`| 2 bytes       |
+| `^uint64(0)`   | **10 bytes**  |
+