commit

Create a git commit.

If a message is provided: $ARGUMENTS
- Use that as the commit message

If no message is provided:
- Analyze the changes with `git diff --staged` (or `git diff` if nothing staged)
- Generate a concise, meaningful commit message

## Steps

1. Check `git status` to see current state
2. If nothing staged, run `git add .` to stage all changes
3. Review what will be committed with `git diff --staged`
4. Create commit:
   - If `$ARGUMENTS` is provided, use it as the message
   - Otherwise, generate a message based on the diff
5. Show the commit result

## Commit Message Format

- Start with type: `feat:`, `fix:`, `docs:`, `refactor:`, `test:`, `chore:`
- Be concise but descriptive (max 72 chars for first line)
- Example: `feat: add user authentication with JWT`

## Output

Show a brief confirmation:
```
✓ Committed: [commit message]
  [number] files changed
```