arc42 Section 5: Building Block View

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This section documents the static decomposition of the system into building blocks. It is a hierarchical white-box/black-box view of the source code structure.

Critical rule: Level-1 is MANDATORY. It is the foundation of all structural understanding. Never skip it.

Depth rule: Stop before individual files or functions. Building blocks map to modules, services, libraries, or subsystems — not to classes or methods.

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