Roll up integration into dev

[loning]

Summary

This rollup includes PR #253 for issue #252, completing production coverage for the Lua SDK toml.decode surface. The change keeps the API decode-only and locks the Lua-facing contract with focused regression tests.

Changes

• Added tests for invalid TOML fail-closed behavior with toml.decode invalid-toml: error text.
• Covered nested tables, strings, booleans, integers, floats, arrays, and Lua sequence indexing through toml.decode.
• Covered empty TOML input returning an empty Lua table.
• Confirmed toml.encode remains absent.

Verification

PR metadata reports pre-merge CI passing, and Codecov reported all modified coverable lines covered.

中文摘要

本次 rollup 合入 #253，完成 #252 中 toml.decode 的生产级行为覆盖。变更保持 decode-only surface，重点补齐 Lua 边界测试、错误分类、数组/表转换和 toml.encode 缺席约束。
⟦AI:FKST⟧

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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