feat: add --version flag to CLI (#15)

Add click.version_option decorator to the main CLI group so that
`wtf --version` prints the version. Previously only the `wtf version`
subcommand was available.

Author: smorin

src/worktreeflow/cli.py

@@ -70,6 +70,7 @@ def format_help_text(self, ctx: click.Context, formatter: click.HelpFormatter) -
 
 
 @click.group(cls=AliasGroup, invoke_without_command=True)
+@click.version_option(version=__version__, prog_name="worktreeflow")
 @click.option("--debug", "-d", is_flag=True, help="Enable debug output (shows bash commands)", envvar="WTF_DEBUG")
 @click.option("--dry-run", "-n", is_flag=True, help="Preview commands without execution", envvar="WTF_DRY_RUN")
 @click.option("--save-history", is_flag=True, help="Save command history to .wtf_history.json")