Initial commit: business card raytracer with explanation

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Preserves Andrew Kensler's original card.cc verbatim and adds:
- CMakeLists.txt building both the original and a de-obfuscated
  variant (card_explained.cc) that produces a visually identical render
- A heavily annotated rewrite explaining the vector ops, ray-sphere
  intersection, soft shadows, depth of field, and reflection recursion
- Rendered sample output (docs/aek.png) embedded in the README
- CLAUDE.md establishing the "never modify card.cc" rule for future work

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Ole-Morten Duesund 2026-05-28 13:47:50 +02:00

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