chore: rename files

[Planeshifter]

Description

What is the purpose of this pull request?

This pull request:

• renames the C source files in number/float64/base/exponent, number/float64/base/mul, and number/float64/base/sub to src/main.c and updates each manifest.json, matching the convention used by 17 of 20 (85%) native packages in number/float64/base.

number/float64/base/exponent

Renames src/exponent.c to src/main.c and updates the single src entry in manifest.json. The C source contents are unchanged.

number/float64/base/mul

Renames src/mul.c to src/main.c and updates the three src entries (build, benchmark, examples) in manifest.json. The C source contents are unchanged.

number/float64/base/sub

Renames src/sub.c to src/main.c and updates the three src entries (build, benchmark, examples) in manifest.json. The C source contents are unchanged.

Related Issues

Does this pull request have any related issues?

No.

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.

• This follows chore: rename C source files according to convention #15435, which applied the same rename to number/float32/base/{from-word,to-word}.
• Namespace summary: 27 members in number/float64/base (the assert sub-namespace excluded). Features analyzed: file tree, package.json/manifest.json key sets, README sections, test/benchmark naming, public signature, return kind, validation prologue, error construction, and JSDoc shape. Every feature with a clear majority (≥75%) conformed apart from the outliers above. Features without a clear majority, such as the presence of native bindings (20/27), were excluded.
• Validation: structural features were extracted from the filesystem, and semantic features were extracted per package from lib/*.js. Each candidate was reviewed by three independent agents: semantic intent, cross-reference, and structural applicability. A repo-wide search found no references to the old filenames outside each package's own manifest.json. Header/include paths, JS exports, and dependents' manifests (which reference packages, not files) are unaffected. Each src/main.c passed gcc -fsyntax-only against its manifest's include dependencies.
• Deliberately excluded: from-binary-string (its input-length validation is semantically required), to-float16/to-float32 (lib/main.js exports a built-in, and the JSDoc lives in polyfill.js), and missing ## See Also sections (generator-owned).

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.".

This PR was written primarily by Claude Code as part of an automated cross-package API drift detection run.

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🤖 Generated with Claude Code

https://claude.ai/code/session_01BMWtWBApHuc6vUnfhs6Qka

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
number/float64/base/exponent	$\\color{green}173/173$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}173/173$ $\\color{green}+100.00\\%$
number/float64/base/mul	$\\color{green}172/172$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}172/172$ $\\color{green}+100.00\\%$
number/float64/base/sub	$\\color{green}172/172$ $\\color{green}+100.00\\%$	$\\color{green}5/5$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}172/172$ $\\color{green}+100.00\\%$

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