[Performance] Optimize unstyled utility

[gonzaloriestra]

WHY are these changes introduced?

The unstyled utility is used frequently in CLI operations, especially during logging and terminal layout calculations. The underlying stripAnsi function uses a complex regular expression that can be computationally expensive when called repeatedly on plain strings.

WHAT is this pull request doing?

Optimizes the unstyled function in packages/cli-kit/src/public/node/output.ts by adding an early return: if (!message.includes('\u001b')) return message. This avoids the regex overhead for any string that doesn't contain ANSI escape codes.

How to test your changes?

CI

Post-release steps

None

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 6608015497183229439 started by @gonzaloriestra

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