MagAgent 0.32.7

MagAgent 0.32.7 adds native visual artifact tools. Agents can now create SVG vector assets, Mermaid diagrams, and simple PNG/JPEG image compositions through create_svg, create_diagram, and create_image instead of generating temporary Python scripts or shell pipelines. The tools are included in selective loading, file mutation tracking, and the files capability pack.\n\nValidation: ruff check src tests, pytest -q, magent docs doctor, python -m build, and twine check all passed.