v0.1.0

Added

• Go module configuration for the project
• Base project template files, including Makefile and golangci-lint configuration
• errs package with shared domain errors for empty commit hashes and failed git execution
• client/git package with a Git client to interact with Git repositories
• Implemented CommitMessage() to retrieve the commit message for a given commit hash
• Implemented Commits() to retrieve commits that come from the provided commit hash
• Implemented CurrentBranch() to retrieve the current branch with its name
• Implemented MergeBase() to retrieve the merge base commit hash between two branches or commits
• Test fixtures and fake shell execution coverage for the Git client
• Integration tests run with a Docker container via testcontainers
• Added AGENTS.md documentation for AI assistants workflow integration

Fixed

• Adjusted golangci-lint configuration and enabled additional linters.