Ensure randomNum includes upper bound

[mrmarufpro]

Summary

• fix random number generator so max value can be returned
• add unit test for randomNum covering inclusive bounds

Testing

• npm test -- --watchAll=false

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https://chatgpt.com/codex/tasks/task_e_6898396d8d0c8325880a6cb6432e1bc3

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Name	Status	Preview	Comments	Updated (UTC)
algo-visu	❌ Failed (Inspect)			Aug 10, 2025 7:00am

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