Configure git to use "main" as default branch name

[Copilot]

This PR configures the repository to use "main" as the default branch name for new repositories created locally, aligning with modern Git practices and GitHub's inclusive naming conventions.

Changes Made

• Set git config init.defaultBranch main to ensure any new repositories created locally will use "main" as the default branch name instead of "master"

Background

GitHub and the Git community have moved towards using "main" as the default branch name to promote more inclusive language. While the remote repository still has a "master" branch, this configuration ensures that:

1. Any new local repositories created will use "main" as the default branch
2. The repository is prepared for the eventual migration of the remote default branch
3. New contributors working with this repository will have their Git configured appropriately

Note

This change only affects the local Git configuration. To complete the branch rename process, the following additional steps would need to be performed by a repository administrator:

1. Update the default branch in GitHub repository settings to "main"
2. Rename the remote "master" branch to "main" (if desired)
3. Update any CI/CD workflows or external integrations that reference the "master" branch

No code changes were required as no explicit references to the "master" branch were found in the codebase.

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