Auto-detect ArticleID from markdown file in yt articles fetch

[ryancheley]

Description

The yt articles fetch command currently requires users to pass the article ID via a flag. This enhancement would allow the command to automatically detect the article ID if the markdown file contains a comment with the format <!-- ArticleID: XXX --> at the top.

Current Behavior

• Users must explicitly pass --article-id (or similar) to update a specific article

Desired Behavior

• If a markdown file has <!-- ArticleID: XXX --> at the top, the command should automatically use that article ID without requiring a flag
• This improves UX by reducing the number of required flags and makes the workflow more ergonomic

Example

<!-- ArticleID: DOCS-A-789 -->
# Article Title
...

Running yt articles fetch --file path/to/file.md should automatically use DOCS-A-789 as the article ID.