⬆️ 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.md

@@ -0,0 +1,27 @@
+# `InPlaceToLower` Function — Semantic Description
+
+The `obiutils.InPlaceToLower` function provides a high-performance, memory-efficient utility for converting ASCII uppercase letters to lowercase **in place**, without allocating new data structures.
+
+## Core Functionality
+- Takes a `[]byte` slice (`data`) as input.
+- Iterates over each byte, identifying uppercase ASCII characters (i.e., `'A'`–`'Z'`, values `65`–`90`).
+- Converts each uppercase byte to its lowercase counterpart using a bitwise OR with `32`, leveraging the ASCII encoding property:  
+  `lowercase = uppercase | 0b0010_0000` (since `'a' - 'A' = 32`).  
+- Returns the **same** `[]byte` slice, now mutated in-place.
+
+## Key Characteristics
+- ✅ **Zero-copy**: No new memory is allocated—ideal for performance-critical or low-level contexts (e.g., streaming, embedded systems).
+- ✅ **ASCII-safe**: Only modifies bytes in the `'A'`–`'Z'` range; other bytes (e.g., digits, symbols, non-ASCII) remain unchanged.
+- ✅ **Idiomatic Go**: Uses idioms like `range` with index/value and bitwise optimization.
+- ⚠️ **Destructive**: Input data is permanently modified—callers must clone if preservation is needed.
+
+## Use Cases
+- Preprocessing raw HTTP headers or payloads.
+- Optimizing case-insensitive comparisons in high-throughput systems.
+- Embedded tools where GC pressure or heap allocation must be minimized.
+
+## Example
+```go
+buf := []byte("HTTP/1.1 200 OK")
+InPlaceToLower(buf) // buf is now []byte("http/1.1 200 ok")
+```