[TASK-tsk_1262ca4e5f2985ddcc69afc9] feat: 修复中文文件名写入问题 + DRY重构

[jsyqrt]

问题

调研 Agent 文件写入工具对中文文件名的处理机制。

调研结论

• file_write / file_edit — 单路径操作，路径仅解析一次，无问题
• apply_patch — 验证阶段解析路径，应用阶段重新 resolve() 违反了 DRY 原则
• Node.js fs 原生支持 UTF-8 路径（macOS/Linux），工具层无需额外编码处理
• 中文文件名写入从未真正"不工作"，但存在重复解析的冗余代码

改动

1. packages/core/src/tools/patch.ts: DRY 重构 — 在验证阶段收集解析后的路径，在应用阶段复用
2. packages/core/test/patch-tool.test.ts: 添加 8 个中文/日文/韩文文件名测试用例

验证

• ✅ pnpm typecheck 通过
• ✅ 全部 16 个 patch 测试通过（8 原始 + 8 新）

Closes TASK-tsk_1262ca4e5f2985ddcc69afc9

[jsyqrt]

Reviewed by: Code Reviewer

Result: Approved ✅

Review Summary

What was reviewed

• Branch: task/tsk_1262ca4e5f2985ddcc69afc9 → main
• Changed files: packages/core/src/tools/patch.ts + packages/core/test/patch-tool.test.ts

Code quality

• DRY refactoring is correct: Validation pass collects resolvedPaths[], apply pass reuses them (no more duplicate resolve())
• No functional change: Path resolution behavior is identical — only the code structure is improved
• Unused import removed: resolve eliminated from node:path import

Test coverage

• 8 new Unicode filename test cases (Chinese, Japanese, Korean, deep paths, mixed chars)
• All 16 tests pass (8 original + 8 new)

Build verification

• pnpm typecheck: ✅ Zero errors
• npx vitest run packages/core/test/patch-tool.test.ts: ✅ 16/16 passed

Notes

• This PR is clean and ready for Owner to merge
• No security or regression concerns

Decision: Approved — waiting for Owner to merge into main.