Fix Blog Images

Fixes image issues in uncommitted blog posts before publishing.

Workflow

1. Run the analysis script:

python3 scripts/fix_blog_images.py --json

2. Review output and for each issue:
   • rename_and_move: Move image to /images/blog/ with descriptive name
   • improve_alt_text: Update alt text to describe the image content
   • missing_image: Locate or remove the reference