⬆️ 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/obiformats/rope_scanner.md

@@ -0,0 +1,27 @@
+# `ropeScanner` — Line-by-Line Text Scanning over a Rope Data Structure
+
+The `obiformats` package provides the `ropeScanner`, an efficient line-oriented iterator over a *Rope* (a tree-based immutable string representation, implemented here as `PieceOfChunk`). This scanner supports streaming large texts without full materialization.
+
+## Core Functionality
+
+- **`newRopeScanner(rope *PieceOfChunk)`**  
+  Constructs a new scanner starting at the root of the rope.
+
+- **`ReadLine() []byte`**  
+  Returns the next line (without trailing `\n`, or `\r\n`) as a byte slice.  
+  - Returns `nil` when the end of the rope is reached.
+  - Reuses internal buffers (`carry`) to handle lines spanning multiple nodes efficiently.
+  - The returned slice aliases rope data and is only valid until the next call.
+
+- **`skipToNewline()`**  
+  Advances internal position to just after the next newline (`\n`), discarding content. Useful for skipping unwanted lines or headers.
+
+## Implementation Highlights
+
+- **Buffered carry-over**: Lines split across rope nodes are assembled incrementally in the `carry` buffer, which grows dynamically.
+- **Cross-platform line endings**: Automatically strips `\r\n`, leaving only the content (no trailing CR).
+- **Zero-copy where possible**: When a line fits entirely within one node and no carry exists, it returns a slice directly into the rope’s underlying data.
+
+## Use Case
+
+Ideal for parsing large text files or streams (e.g., OBIE/Obi formats) where memory efficiency and streaming behavior are critical—without loading the entire content into RAM.