Fix #211: Replace abandoned git wrapper

[samdark]

Closes #211.

Summary

• Remove the abandoned symplify/git-wrapper dependency.
• Add a small in-tree Git adapter backed by symfony/process for the Git operations used by the dev tool.
• Update commands and package validation to use the local adapter.

Notes

• Considered maintained alternatives including gitonomy/gitlib and czproject/git-php. Since both shell out to Git and the project already depends on symfony/process, this keeps the dependency graph smaller while preserving the current feature surface.

Verification

• php -l on changed PHP files
• composer validate --strict --no-check-lock
• git diff --check
• read-only smoke checks for branch, remote URL, tags, status, and shortlog

No mutating dev-tool Git commands were run during verification.

[Copilot]

Pull request overview

This PR replaces the abandoned symplify/git-wrapper dependency with a small in-repo Git adapter built on symfony/process, and updates existing commands/components to use the new adapter for the Git operations needed by the dev tool.

Changes:

• Removed symplify/git-wrapper from composer.json.
• Added an in-tree Git adapter (GitWorkingCopy, GitBranches, GitTags, GitException) backed by Symfony\Component\Process\Process.
• Updated package Git working copy creation and the contributors stats command to use the new adapter API.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/App/Component/Package/Package.php	Switches from GitWrapper to a local GitWorkingCopy instance using a discovered git binary.
src/App/Component/Git/GitWorkingCopy.php	New process-backed Git adapter (core implementation).
src/App/Component/Git/GitBranches.php	New helper for listing branches and determining HEAD.
src/App/Component/Git/GitTags.php	New helper for listing tags.
src/App/Component/Git/GitException.php	New exception type for adapter failures.
src/App/Command/Stats/ContributorsCommand.php	Uses the adapter to run git shortlog with structured args/options.
src/App/Command/Release/MakeCommand.php	Updates imports to the new GitWorkingCopy.
src/App/Command/Git/PushCommand.php	Updates exception import to the new GitException.
src/App/Command/AddChangelogCommand.php	Updates imports to the new GitWorkingCopy.
composer.json	Removes the abandoned symplify/git-wrapper dependency.

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