fix: rename stray segmentTrackEnd call to trackCommandEnd

[angeloashmore]

Resolves:

Description

A leftover reference to the pre-refactor segmentTrackEnd was missed in #174. This renames it to trackCommandEnd so the file type-checks again.

Checklist

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Note

Low Risk
Low risk: a one-line rename to call the correct tracking helper; behavior should match other error paths and primarily fixes TypeScript/type-checking.

Overview
Fixes the UnknownRequestError handler in src/index.ts to call trackCommandEnd (instead of the leftover segmentTrackEnd) when recording failed commands, aligning error tracking with the post-refactor API and restoring type-checking.

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