docs(zh,en): add ch-06 causality mental-model articles#4

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PanQiWei merged 3 commits intomainfrom

mental-models/ch-06

Apr 9, 2026

Commits on Apr 9, 2026

docs(zh,en): add ch-06 causality mental-model articles with infographics

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chore: compress PNGs under 2MB, add git-lfs tracking

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chore: add PNG compression step to all card-generating workflows

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