feat: add math/base/special/erfcinvf

[whizzel]

Ref: #649 .

Description

What is the purpose of this pull request?

This pull request:

• Adds the complete implementation for math/base/special/erfcinvf

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Add C implementations to base special math functions (tracking issue) #649

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

No.

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

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

{{TODO: add disclosure if applicable}}

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@stdlib-js/reviewers

[whizzel]

/stdlib update-copyright-years

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/erfcinvf	$\color{red}648/696$ $\color{green}+93.10%$	$\color{red}40/51$ $\color{green}+78.43%$	$\color{red}6/7$ $\color{green}+85.71%$	$\color{red}648/696$ $\color{green}+93.10%$

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

[whizzel]

/stdlib help

[stdlib-bot]

@ivishal-g, available slash commands include:

• /stdlib check-files - Check for required files.
• /stdlib make-commands - Print make commands for package changed in PR.
• /stdlib update-copyright-years - Update copyright header years.
• /stdlib lint-autofix - Auto-fix lint errors.
• /stdlib merge - Merge changes from develop branch into this PR.
• /stdlib rebase - Rebase this PR on top of develop branch.

[whizzel]

/stdlib lint-autofix