Complete onboarding exercises 1-5

[Nickhegde]

Checklist

Please ensure you have followed all of the steps below before submitting a pull request:

• Test your code (npm test or npm run test)
• Check your types (npm run typecheck)
• Lint your code (npm run lint)
• Format your code (npm run format)
• Document your code with TSDoc comments

Overview

Completes onboarding exercises 1–5:

• 01 - Algorithms and Testing: Implemented rotateArray, which rotates an array to the right by a given number of steps, correctly handling steps larger than the array length and negative steps. Replaced the test scaffold's it.todo placeholders with real assertions covering rotation, wraparound, negative steps, non-mutation, and empty-array input.
• 02 - Writing TSDoc Comments: Replaced placeholder TSDoc on formatFullName with a full description, parameter docs, and return value docs.
• 03 - Fixing Type Errors: Fixed the type error in scores (a string literal "6" where ScoreEntry.score expects a number) without changing getHighestScore's behaviour.
• 04 - Fixing Linting Issues: Removed the unused ignoredValue and replaced the unsafe any type on record with a concrete { name: string } type in formatReviewer.
• 05 - Fixing Formatting: Ran npm run format; the file was already Prettier-compliant, confirmed via an empty diff after running the command.

Test Plan

• Ran npm run test - all tests pass, including the 5 tests added for rotateArray (rotation, wraparound past array length, negative steps, non-mutation, empty array).
• Ran npm run typecheck - no type errors.
• Ran npm run lint - no lint errors.
• Ran npm run format - confirmed via git diff that no formatting changes were needed on the exercise 5 file.

[dvorakjt]

Approved. Well done!