improve: add AGENTS.md and harden flatten list typing#28

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improve/json2sql-20260624080838

Commits on Jun 24, 2026

improve: add AGENTS.md and harden flatten list typing
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fix: harden list-of-dict type checks in flatten paths by reviewer-B
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Commits on Jun 25, 2026

style: auto-fix ruff import sorting (I001)
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