feat: add `dev_dependencies` manifest section - #341

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fischeti wants to merge 3 commits into

Commits on Aug 3, 2026

Add `dev_dependencies` manifest section

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claude
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tests: Move dev-dependency tests into config unit tests and `resolution.rs`

fischeti
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claude
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Drop the `dev-dependencies` alias in favour of snake_case only

fischeti
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claude
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