Add multilingual Agila learning examples and Git practice guide

en/ai-review-and-contribute/main.md

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+# Review packet
+
+Problem and intended behavior:
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+Tools / compiler / SDK revision:
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+Build and run commands:
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+Test case | Expected | Actual | Why this case matters
+
+Design choice and failure policy:
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+AI assistance and my verification:
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+Known limitations:
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+Automated feedback and revisions:
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+Next learning objective: