chore: address commit comments for halfnormal logpdf

[GuneetGill]

Resolves #11289.

Description

What is the purpose of this pull request?

This pull request:

• Updates the halfnormal/logpdf README so the distribution name follows project prose style (half-normal, not “Half-Normal”) in the linked intro line.
• Migrates benchmark/benchmark.js to generate benchmark data with @stdlib/random/array/uniform instead of the older randu/manual array pattern.
• Migrates benchmark/benchmark.native.js the same way, using uniform with { 'dtype': 'float64' } so the native benchmark matches current conventions used by similar packages (e.g. normal/logpdf).

These changes address the review comments on commit f4a07184f537ba8ef7928eb6cca51d0e1732f50e referenced in #11289.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• Address commit comments (commit f4a0718) #11289

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

I used Cursor to understand the codebase to get a general sense of how the files I am touching work with one another. The code was written and tested by me.

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