Layout engine polish: sparse-child fix, exhaustive edge tests, invariants docs#63

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layout-engine-polish

Feb 17, 2026

Commits on Feb 17, 2026

fix(layout): handle sparse stack children safely
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test(layout): add exhaustive edge-case coverage across A-I
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docs(layout): codify layout invariants and resolution order
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test(layout): extend flex-distribution edge matrix
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fix(layout): ignore sparse holes in stack gap/justify math
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ci: disable recursive submodule checkout in PR workflows
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style(layout-tests): apply biome formatting and import ordering
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