v0.4.1

• Added OCR_MARKDOWN_IGNORE_LABELS to control which layout labels are dropped from the markdown output. (#1)
• Added OCR_ENGINE to select the OCR engine: vl (default), text, or structure, each with its own baked image. (#1)
• Renamed the baked image to :latest-vl-baked / :v0.4.1-vl-baked (was :latest-baked / :v0.4.0-baked); latest-baked remains an alias.