Update readme#2

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0ca wants to merge 13 commits intoElectrovoltSec:mainfrom

0ca:update-readme

Commits on Feb 1, 2026

fix: remove exposed flag from EV-02 Dockerfile, fix EV-04 typo
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fix(EV-03): add MongoDB healthcheck to prevent startup race condition

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claude
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fix(EV-03): use mongo:4.4 for ARM compatibility

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claude
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Commits on Feb 2, 2026

Commits on Feb 3, 2026

fix: EV-12 to EV-16 challenge fixes

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claude
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Commits on Feb 4, 2026

docs: document all challenge fixes in README

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