Migrate project to pnpm package manager

[chrissena]

• Add packageManager field to package.json (pnpm@10.25.0)
• Update scripts to use pnpm instead of npm run
• Update CI/CD workflows to use pnpm/action-setup@v4
• Replace package-lock.json with pnpm-lock.yaml
• Add pnpm-workspace.yaml with build script permissions

Description

Related Issue

Fixes #(issue number)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Test improvement

Changes Made

• Change 1
• Change 2
• Change 3

Testing

• All existing tests pass
• Added new tests for new functionality
• Manually tested the changes
• Updated documentation

Test Commands Run

npm test
npm run build
npm run lint

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes