docs: add cosine wave visualization to simulate/iter/cosine-wave

[kaushal-kumar-it]

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Description

What is the purpose of this pull request?

This pull request adds a cosine wave visualization to the
@stdlib/simulate/iter/cosine-wave documentation. The figure illustrates the
shape of a cosine waveform over multiple periods and helps readers better
understand how the iterator generates values over time.

This update improves the usability and clarity of the package documentation by
providing a visual reference alongside the mathematical description.

Related Issues

Does this pull request have any related issues?

This pull request is not associated with any existing issues.

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No.

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No.

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• Read, understood, and followed the contributing guidelines.

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Coverage Report

Package	Statements	Branches	Functions	Lines
simulate/iter/cosine-wave	$\color{green}300/300$ $\color{green}+100.00%$	$\color{green}32/32$ $\color{green}+100.00%$	$\color{green}5/5$ $\color{green}+100.00%$	$\color{green}300/300$ $\color{green}+100.00%$

The above coverage report was generated for the changes in this PR.

[kgryte]

@kaushal-kumar-it Thanks for looking to resolve the TODO. My general comment is that, rather than static figures, we'd leverage stdlib's plot functionality to generate plots as part of an automated build process similar to what we do for SVG equations. Unfortunately, the plot API is currently being refactored and is under construction. Hence, my initial inclination is that we'd should put this PR on hold until the upstream changes have been completed and we can autogenerate as part of a workflow.

[kaushal-kumar-it]

Thanks @kgryte for the clarification. That approach makes sense. I’m fine with putting this PR on hold until the plot API refactor is complete and we can generate plots via an automated workflow.