ci(*): replace deprecated macos-13 runner image with macos-15-intel

[lumirlumir]

This pull request updates the supported macOS runner versions for CI workflows and documentation, removing references to the deprecated macos-13 runners and introducing macos-15-intel as the new x64 build and test environment. These changes ensure the project uses currently supported and available GitHub Actions runners, improving compatibility and reliability.

CI Workflow Updates:

• Replaced macos-13 (x64) with macos-15-intel in the build matrix for .github/workflows/llvm-build-bump-pr.yml, ensuring x64 builds use the latest supported runner.
• Updated the test matrix in .github/workflows/test-cross-platform.yml to add macos-15-intel and remove macos-13, aligning test environments with available runners.

Documentation Updates:

• Removed macOS 13 and macOS 13 Arm64 from the supported runners table in website/docs/get-started/supported.md, reflecting the deprecation of these environments.
• Updated the binary build/test image table in website/docs/get-started/supported.md to use macos-15-intel for darwin-x64 builds and tests instead of macos-13.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
npm-clang-format-node-website	Ready	Preview	Comment	Nov 1, 2025 2:19pm

[github-actions]

Labels have been automatically applied based on the Conventional Commits specification.🏷️

[codecov]

Bundle Report

Changes will decrease total bundle size by 166 bytes (-0.03%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
website-esm	599.16kB	-166 bytes (-0.03%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: website-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
@localSearchIndexroot.*.js	18 bytes	87.44kB	0.02%
docs_get-started_supported.*.js	-184 bytes	10.17kB	-1.78%

Files in docs_get-started_supported.*.js:

• ./docs/get-started/supported.md → Total Size: 9.93kB

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9cedc04) to head (6716c2e).
⚠️ Report is 1 commits behind head on main.

@@            Coverage Diff            @@
##              main      #511   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          424       424           
=========================================
  Hits           424       424           

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[Copilot]

Pull Request Overview

This PR migrates from the deprecated macOS 13 GitHub Actions runner to macOS 15 Intel for x64 Darwin builds, removing support for macOS 13 and updating all references to use the newer runner image.

Key changes:

• Replaces macos-13 runner with macos-15-intel in CI workflows
• Removes macOS 13 and macOS 13 Arm64 entries from the supported runner images documentation
• Updates build documentation to reflect the new macOS 15 Intel runner for darwin-x64 builds

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
website/docs/get-started/supported.md	Removes macOS 13 entries from supported runners table and updates darwin-x64 build documentation to reference macos-15-intel
.github/workflows/test-cross-platform.yml	Replaces macos-13 with macos-15-intel in test matrix
.github/workflows/llvm-build-bump-pr.yml	Updates darwin build matrix to use macos-15-intel for x64 builds

Comments suppressed due to low confidence (1)

website/docs/get-started/supported.md:69

• Corrected spelling of 'excuatable' to 'executable'.

We used the following Images to build `clang-format` excuatable binaries.

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