test: migrate math/base/special/rcbrtf to ULP-based testing

[Planeshifter]

Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• migrates test/test.js and test/test.native.js for math/base/special/rcbrtf from relative-tolerance (EPS-based) assertions to the testing approach described in [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352. The maximum ULP difference between actual and expected values (computed via direct ULP-difference comparison against the float32-coerced test fixtures, replicating the tests' float64ToFloat32( expected[ i ] ) transformation) is 0 for every fixture block in both the JavaScript and native (C) implementations, so, per maintainer guidance, all tolerance-based branches were collapsed to plain t.strictEqual( y, e, 'returns expected value' ) exact-equality assertions rather than isAlmostSameValue with a 0 ULP tolerance.
• removes the now-unused delta/tol variables and the now-unused EPS (@stdlib/constants/float32/eps) and abs requires from both test files.

The native implementation does not diverge from the JavaScript implementation (all native assertions pass with exact equality), so no enlarged native tolerances (and no accompanying compiler-optimization NOTE comments) were needed.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352

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.

• Minimum ULP values were verified by an independent recomputation over all fixture files (15 blocks, JS implementation): max ULP difference is 0 everywhere, so exact equality is the tightest possible assertion.
• Both the JavaScript and native test suites were run via the official test harness and passed (48052/48052 assertions, no skips).
• Pre-existing quirks were intentionally left untouched to keep the diff minimal: the [-50,-500] test description has an unclosed backtick, and the [1e-30,1e-38]/[-1e-30,-1e-38] interval bounds in the descriptions are reversed.

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

This PR was written by Claude Code as part of an automated test migration workflow for #11352, including computation of the minimum required ULP values, and was adversarially verified by a second Claude Code agent which independently recomputed the ULP values from the test fixtures.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/rcbrtf	$\\color{green}188/188$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}188/188$ $\\color{green}+100.00\\%$

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