New features in Git 2.54: easier rebasing, hooks, and statistics

Git 2.54 introduces three notable features. The new `git history` command simplifies common rebase operations: `git history reword` lets you change a commit message without checking out the branch, and `git history split` lets you split a commit into two using an interactive hunk selector — both without requiring a branch checkout. Config-based hooks are now supported, allowing hooks to be defined directly in git config using `git config set hook.<name>.event` and `git config set hook.<name>.command`, making setup easier. Finally, `git repo structure` provides repository statistics including object counts, inflated size, disk size, and largest objects — useful for diagnosing performance issues in high-velocity repos. The `git history` command is currently experimental and does not support merge commits.