[Tcode-Motion]

🎯 What: Refactored register_sqlite in stdlib/src/sqlite.rs by extracting inline callback closures for open, execute, query, and close into standalone functions and added unit test coverage.

💡 Why: register_sqlite was excessively long and complex due to monolithic inline closures. Extracting callbacks improves code maintainability and readability.

✅ Verification: Added unit tests for the SQLite standard library module and verified that cargo test --workspace --all-targets passes completely.

✨ Result: Significantly improved readability and testability of stdlib/src/sqlite.rs.

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PR created automatically by Jules for task 8445241269068069886 started by @Tcode-Motion

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