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!-- Timestamp: 2025-06-07 02:32:37
!-- Author: ywatanabe
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## Code Organization
- src and tests: no scitex dependency
- src, tests, and examples:
  - strictly mirror structure to link each other
  - Understand different roles
- Use .playground for temporal testing
- Relocate valuable .playground files to permanent locations
- Remove or hide obsolete, dirty, misleading files
- Keep production-ready codebase for publishing anytime

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