perf(linter/plugins): faster check for cwd

[overlookmotel]

Follow-on after #14814. Small perf optimization. cwd is either null or a string, so use cheaper === null check instead of ?? (which is equivalent to cwd === null || cwd === undefined).

Also rename the var, just for brevity.

[overlookmotel]

• perf(linter/plugins): faster check for cwd #15301 👈 (View in Graphite)
• main

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[overlookmotel]

Merge activity

• Nov 5, 10:33 AM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Nov 5, 10:35 AM UTC: overlookmotel added this pull request to the Graphite merge queue.
• Nov 5, 10:44 AM UTC: Merged by the Graphite merge queue.

[Copilot]

Pull Request Overview

This PR refactors the current working directory caching mechanism in the Context class. The change removes the getInternal validation check when accessing context.cwd since the current working directory is a global property that can be safely accessed even within createOnce.

• Renamed cachedCwd to cwd for clarity
• Removed the getInternal() guard from the cwd getter to allow access in createOnce
• Replaced nullish coalescing with an explicit null check

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