Xubin Ren 075bdd5c3c refactor: move SafeFileHistory to module level + add regression tests
- Promote _SafeFileHistory to module-level SafeFileHistory for testability
- Add 5 regression tests: surrogates, normal text, emoji, mixed CJK, multi-surrogates

Made-with: Cursor
2026-04-07 13:57:34 +08:00
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