feat(c4-diagrams): add multi-boundary layout patterns#6

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scotwells wants to merge 2 commits intomainfrom

feat/c4-multi-boundary-layout-patterns

Commits on Mar 1, 2026

feat(c4-diagrams): add multi-boundary layout patterns

scotwells
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claude
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docs(c4-diagrams): add guidance on internal vs external elements

scotwells
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claude
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