docs(lab3): add submission#3

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MiniMaxC wants to merge 10 commits into

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Commits on Jun 11, 2026

docs(lab1,lab2): clarify GitHub auth vs signing SSH key roles; add publickey-denied pitfalls
Cre-eD
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docs(lab3): matrix renames required checks — warn + ci-ok gate pattern; set honest cache expectations
Cre-eD
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Commits on Jun 16, 2026