restore 01-grundlagen.md for 223015b
accidentally removed ina8343c9, restored fromd77b0f2Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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accidentally removed ina8343c9, restored fromd77b0f2Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>