test: add parityOutlier invariant test for Issue #24 - #62

Description
Added invariant property tests and contract checks for parityOutlier in Maths/ParityOutlier.js, and created the required check runner script.

Related Issue
Fixes: #24

Type of Change

• Bug Fix
• New Feature
• UI/UX Improvement
• Performance Improvement
• Tests
• Documentation
• Refactoring / Maintenance
• CI/CD

Changes Made

• Tested smallest valid input ([1, 2]) and ordinary input ([1, 2, 16, -8848, 5126]), referencing precondition source line 9 of Maths/ParityOutlier.js.
• Implemented a 100-case seeded property generator in Maths/test/ParityOutlier.test.js to verify parity outlier invariants and array non-mutation.
• Created work/R50-T024/check.py to execute the test suite in non-watch mode and capture test output, fixture results, and tool versions.

Screenshots / Recordings
N/A

Testing

• Executed python3 work/R50-T024/check.py locally.
• Verified test suite passes for Maths/test/ParityOutlier.test.js.

Checklist

• I have tested my changes locally.
• I have added or updated tests, if needed.
• I have updated documentation, if needed.
• I have followed the project's coding guidelines.
• I have run the relevant tests and checks.
• I have addressed previous review feedback, if applicable.

Additional Notes
N/A