feat(*): support textlint v15

[lumirlumir]

This pull request introduces a new GitHub Actions workflow for cross-platform testing and updates the textlint peer dependency to support version 15. The changes aim to enhance testing coverage across multiple environments and ensure compatibility with newer versions of textlint.

Cross-platform testing:

• .github/workflows/test-cross-platform.yml: Added a new workflow named test-cross-platform to run tests across macos-latest, ubuntu-latest, and windows-latest using multiple versions of Node.js (24.x, 22.x, 20.x) and textlint (15, 14). This ensures comprehensive testing across different platforms and configurations.

Dependency updates:

• package.json: Updated the textlint peer dependency to include support for version 15.0.0 in addition to 14.0.0, ensuring compatibility with the latest version.

[Copilot]

Pull Request Overview

This PR adds support for textlint version 15 by introducing comprehensive cross-platform testing and updating the peer dependency range. The changes ensure the package works reliably across different operating systems and Node.js versions with both textlint v14 and v15.

• Added comprehensive cross-platform testing workflow for multiple OS and Node.js versions
• Updated peer dependency to support textlint v15 alongside existing v14 support

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
package.json	Updated peer dependency to support textlint v15 in addition to v14
.github/workflows/test-cross-platform.yml	Added new GitHub Actions workflow for cross-platform testing across multiple OS, Node.js, and textlint versions

[github-actions]

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (79db0fc) to head (fa9e044).
⚠️ Report is 1 commits behind head on main.

@@            Coverage Diff            @@
##              main      #306   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          224       224           
  Branches         1         1           
=========================================
  Hits           224       224           

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