kahwee / bunki / 18697510352

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style: use proper ESM imports for node:fs/promises instead of fs.promises

Update imports across the codebase to use the standard ESM format:
- `import { mkdir } from "node:fs/promises"` instead of `import fs from "fs"`
- Use direct function imports: `mkdir()`, `rm()`, `writeFile()`
- More efficient and aligns with ESM best practices

Files updated:
- src/utils/file-utils.ts: Use `mkdir` from `node:fs/promises`
- test/utils/file-utils.test.ts: Use `mkdir`, `writeFile as fsWriteFile`, `rm`
- CLAUDE.md: Document proper ESM import pattern for Node.js fallback APIs

All 166 tests passing (574 assertions), code properly formatted.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

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1417 of 1655 relevant lines covered (85.62%)

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