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⚡ optimize modifyWithEditor with async I/O#69

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TrueAlpha-spiral wants to merge 1 commit intomainfrom
performance-optimization-modifiable-tool-5429899756666737661
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⚡ optimize modifyWithEditor with async I/O#69
TrueAlpha-spiral wants to merge 1 commit intomainfrom
performance-optimization-modifiable-tool-5429899756666737661

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@TrueAlpha-spiral
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The modifyWithEditor function and its helpers were using synchronous I/O, which blocks the event loop. Given that the main function is already async, I have converted the internal file system operations to use node:fs/promises. This change also includes parallelizing independent I/O tasks (like reading/writing both "old" and "new" temp files) to further improve efficiency. Existing error handling patterns were preserved to ensure robustness.


PR created automatically by Jules for task 5429899756666737661 started by @TrueAlpha-spiral

- Replaced synchronous `fs` methods (`readFileSync`, `writeFileSync`, `mkdirSync`, `unlinkSync`) with asynchronous `node:fs/promises`.
- Parallelized I/O operations using `Promise.all` for temp file creation, reading, and deletion.
- Maintained existing error handling for `ENOENT` and cleanup failures.
- Updated `modifyWithEditor` to `await` the now-asynchronous helper functions.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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