Move Python generation step into Docker, no local Python required
Add python3 and python3-yaml to the Docker image so generate_cards.py runs inside the container. Both the generate and build-blanko Makefile targets now use docker run instead of a local python3 call. Remove Python/PyYAML from the README prerequisites. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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