feat: add constants/float16/ln-two

[opbot-xd]

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type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:

• task: lint_filenames status: passed
• task: lint_editorconfig status: passed
• task: lint_markdown status: passed
• task: lint_package_json status: passed
• task: lint_repl_help status: passed
• task: lint_javascript_src status: passed
• task: lint_javascript_cli status: na
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• task: lint_javascript_tests status: passed
• task: lint_javascript_benchmarks status: na
• task: lint_python status: na
• task: lint_r status: na
• task: lint_c_src status: na
• task: lint_c_examples status: na
• task: lint_c_benchmarks status: na
• task: lint_c_tests_fixtures status: na
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• task: lint_typescript_declarations status: passed
• task: lint_typescript_tests status: passed
• task: lint_license_headers status: passed

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Description

What is the purpose of this pull request?

This pull request:

• Adds the @stdlib/constants/float16/ln-two package, which provides the half-precision (float16) approximation of the natural logarithm of 2 (ln(2) ≈ 0.69336).
• Includes complete implementation with documentation, unit tests, examples, TypeScript declarations, and REPL help text.
• Follows all stdlib package conventions and style guidelines.

Related Issues

Does this pull request have any related issues?

This pull request addresses the need for additional float16 mathematical constants in stdlib, complementing the existing float64 ln-two constant.

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.

Implementation Notes:

• The float16 value 0.69336 was calculated as the half-precision representation of ln(2) ≈ 0.6931471805599453
• All tests pass with 100% coverage
• Package structure mirrors existing float16 constants (e.g., @stdlib/constants/float16/e)

Test Results:

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

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
constants/float16/ln-two	$\color{green}51/51$ $\color{green}+100.00%$	$\color{green}1/1$ $\color{green}+100.00%$	$\color{green}0/0$ $\color{green}+100.00%$	$\color{green}51/51$ $\color{green}+100.00%$

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

[DivyanshuVortex]

Hey @opbot-xd , PR for this package is aldready open #8972 , Whole log family is also most done for float16