docs: update cargo docs

[guibeira]

cd engine && cargo doc && cd .. && open target/doc/iii/index.html

[vercel]

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Project	Deployment	Actions	Updated (UTC)
iii-docs	Ready	Preview, Comment	Mar 11, 2026 10:21pm
iii-website	Ready	Preview, Comment	Mar 11, 2026 10:21pm
motia-docs	Ready	Preview, Comment	Mar 11, 2026 10:21pm

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